PHP study notes 10GD image processing
php
code
Image processing
study notes
Open source
programming
programming language
software development
<span style="color: #008080;"> 1</span> <span style="color: #000000;">php
</span><span style="color: #008080;"> 2</span> <span style="color: #008000;">//</span><span style="color: #008000;">1. 图片背景管理</span>
<span style="color: #008080;"> 3</span> <span style="color: #008000;">/*</span><span style="color: #008000;"> imagecreatefromjpeg($filename) 从jpeg文件或者url新建一图像
</span><span style="color: #008080;"> 4</span> <span style="color: #008000;"> * imagecreatefrompng($filename) 从png文件或者url新建一图象
</span><span style="color: #008080;"> 5</span> <span style="color: #008000;"> * imagecreatefromgif($filename) 从gif文件或者url新建一图像
</span><span style="color: #008080;"> 6</span> <span style="color: #008000;"> * 用完之后要用imagedestroy()函数进行销毁
</span><span style="color: #008080;"> 7</span> <span style="color: #008000;"> * getimagesize($filename) 返回数组,0宽1高,2类型(1GIF,2JPG,3PNG,4SWF..),3是可用于img标记的文本字符串(height="x" width="y")
</span><span style="color: #008080;"> 8</span> <span style="color: #008000;">*/</span>
<span style="color: #008080;"> 9</span> <span style="color: #008000;">//</span><span style="color: #008000;">该方法用于自动识别类型并打开图片,使用传入的func函数操作图片,vars是参数列表
</span><span style="color: #008080;"> 10</span> <span style="color: #008000;"> //如果返回的是不是原image,要在func中摧毁image</span>
<span style="color: #008080;"> 11</span> <span style="color: #0000ff;">function</span> imagego(<span style="color: #800080;">$filename</span>, <span style="color: #800080;">$func</span>, <span style="color: #800080;">$vars</span><span style="color: #000000;">){
</span><span style="color: #008080;"> 12</span> <span style="color: #0000ff;">list</span>(<span style="color: #800080;">$width</span>, <span style="color: #800080;">$height</span>, <span style="color: #800080;">$type</span>, <span style="color: #800080;">$attr</span>) = <span style="color: #008080;">getimagesize</span>(<span style="color: #800080;">$filename</span><span style="color: #000000;">);
</span><span style="color: #008080;"> 13</span> <span style="color: #800080;">$types</span> = <span style="color: #0000ff;">array</span>(1=>"gif", 2=>"jpeg", 3=>"png"<span style="color: #000000;">);
</span><span style="color: #008080;"> 14</span> <span style="color: #008000;">//</span><span style="color: #008000;">组合创建图像函数名</span>
<span style="color: #008080;"> 15</span> <span style="color: #800080;">$createfrom</span> = "imagecreatefrom".<span style="color: #800080;">$types</span>{<span style="color: #800080;">$type</span><span style="color: #000000;">};
</span><span style="color: #008080;"> 16</span> <span style="color: #800080;">$image</span> = <span style="color: #800080;">$createfrom</span>(<span style="color: #800080;">$filename</span><span style="color: #000000;">);
</span><span style="color: #008080;"> 17</span> <span style="color: #008000;">//</span><span style="color: #008000;">对该图片进行操作</span>
<span style="color: #008080;"> 18</span> <span style="color: #800080;">$image</span> = <span style="color: #800080;">$func</span>(<span style="color: #800080;">$image</span>, <span style="color: #800080;">$width</span>, <span style="color: #800080;">$height</span>, <span style="color: #800080;">$type</span>, <span style="color: #800080;">$vars</span><span style="color: #000000;">);
</span><span style="color: #008080;"> 19</span> <span style="color: #008000;">//</span><span style="color: #008000;">组合输出图像函数名</span>
<span style="color: #008080;"> 20</span> <span style="color: #800080;">$output</span> = "image".<span style="color: #800080;">$types</span>{<span style="color: #800080;">$type</span><span style="color: #000000;">};
</span><span style="color: #008080;"> 21</span> <span style="color: #800080;">$filename_s</span> = <span style="color: #008080;">preg_split</span>("/\\./", <span style="color: #800080;">$filename</span><span style="color: #000000;">);
</span><span style="color: #008080;"> 22</span> <span style="color: #800080;">$filename</span> = <span style="color: #800080;">$filename_s</span>{0}."_${func}.".<span style="color: #800080;">$filename_s</span>{1<span style="color: #000000;">};
</span><span style="color: #008080;"> 23</span> <span style="color: #800080;">$output</span>(<span style="color: #800080;">$image</span>, <span style="color: #800080;">$filename</span><span style="color: #000000;">);
</span><span style="color: #008080;"> 24</span>
<span style="color: #008080;"> 25</span> imagedestroy(<span style="color: #800080;">$image</span><span style="color: #000000;">);
</span><span style="color: #008080;"> 26</span> <span style="color: #000000;"> }
</span><span style="color: #008080;"> 27</span> <span style="color: #008000;">//</span><span style="color: #008000;">该方法用于在图片上加上字符串,传入一个参数表示添加的字符串</span>
<span style="color: #008080;"> 28</span> <span style="color: #0000ff;">function</span> imageaddstring(<span style="color: #800080;">$image</span>, <span style="color: #800080;">$width</span>, <span style="color: #800080;">$height</span>, <span style="color: #800080;">$type</span>, <span style="color: #800080;">$vars</span><span style="color: #000000;">){
</span><span style="color: #008080;"> 29</span> <span style="color: #800080;">$string</span> = <span style="color: #800080;">$vars</span>{0<span style="color: #000000;">};
</span><span style="color: #008080;"> 30</span> <span style="color: #800080;">$sx</span> = (<span style="color: #800080;">$width</span> - imagefontwidth(5)*<span style="color: #008080;">strlen</span>(<span style="color: #800080;">$string</span>))/2<span style="color: #000000;">;
</span><span style="color: #008080;"> 31</span> <span style="color: #800080;">$sy</span> = (<span style="color: #800080;">$height</span> - imagefontheight(5))/2<span style="color: #000000;">;
</span><span style="color: #008080;"> 32</span> <span style="color: #800080;">$textcolor</span> = imagecolorallocate(<span style="color: #800080;">$image</span>, 255, 0, 0<span style="color: #000000;">);
</span><span style="color: #008080;"> 33</span> imagestring(<span style="color: #800080;">$image</span>, 5, <span style="color: #800080;">$sx</span>, <span style="color: #800080;">$sy</span>, <span style="color: #800080;">$string</span>, <span style="color: #800080;">$textcolor</span><span style="color: #000000;">);
</span><span style="color: #008080;"> 34</span> <span style="color: #0000ff;">return</span> <span style="color: #800080;">$image</span><span style="color: #000000;">;
</span><span style="color: #008080;"> 35</span> <span style="color: #000000;"> }
</span><span style="color: #008080;"> 36</span> imagego("img/1.jpg", "imageaddstring", <span style="color: #0000ff;">array</span>("Add a string on JPEG"<span style="color: #000000;">));
</span><span style="color: #008080;"> 37</span> imagego("img/2.gif", "imageaddstring", <span style="color: #0000ff;">array</span>("Add a string on GIF"<span style="color: #000000;">));
</span><span style="color: #008080;"> 38</span> imagego("img/3.png", "imageaddstring", <span style="color: #0000ff;">array</span>("Add a string on PNG"<span style="color: #000000;">));
</span><span style="color: #008080;"> 39</span>
<span style="color: #008080;"> 40</span> <span style="color: #008000;">//</span><span style="color: #008000;">2. 图片缩放与裁剪处理</span>
<span style="color: #008080;"> 41</span> <span style="color: #008000;">/*</span><span style="color: #008000;"> imagecopyresized
</span><span style="color: #008080;"> 42</span> <span style="color: #008000;"> * imagecopyresampled($dst_img.$src_img,$dst_x,$dst_y,$src_x,$src_y,$dst_w,$dst_h,$src_w,$src_h)
</span><span style="color: #008080;"> 43</span> <span style="color: #008000;"> * 以上两个函数都可以进行图片缩放,后者效果好一些.该函数可以在图像内部复制,但当区域重复时后果不可知
</span><span style="color: #008080;"> 44</span> <span style="color: #008000;"> * 如果源和目标的高宽不一样,则会自动进行缩放.
</span><span style="color: #008080;"> 45</span> <span style="color: #008000;"> * 同时,该函数也可以实现图像的裁剪.
</span><span style="color: #008080;"> 46</span> <span style="color: #008000;">*/</span>
<span style="color: #008080;"> 47</span> <span style="color: #008000;">//</span><span style="color: #008000;">该方法用于缩小图片1.5倍</span>
<span style="color: #008080;"> 48</span> <span style="color: #0000ff;">function</span> imagethumb(<span style="color: #800080;">$image</span>, <span style="color: #800080;">$width</span>, <span style="color: #800080;">$height</span>, <span style="color: #800080;">$type</span>, <span style="color: #800080;">$vars</span><span style="color: #000000;">){
</span><span style="color: #008080;"> 49</span> <span style="color: #800080;">$p</span> = <span style="color: #800080;">$vars</span>{0<span style="color: #000000;">};
</span><span style="color: #008080;"> 50</span> <span style="color: #800080;">$n_image</span> = imagecreatetruecolor(<span style="color: #800080;">$width</span>/<span style="color: #800080;">$p</span>, <span style="color: #800080;">$height</span>/<span style="color: #800080;">$p</span><span style="color: #000000;">);
</span><span style="color: #008080;"> 51</span> imagecopyresampled(<span style="color: #800080;">$n_image</span>, <span style="color: #800080;">$image</span>, 0, 0, 0, 0, <span style="color: #800080;">$width</span>/<span style="color: #800080;">$p</span>, <span style="color: #800080;">$height</span>/<span style="color: #800080;">$p</span>, <span style="color: #800080;">$width</span>, <span style="color: #800080;">$height</span><span style="color: #000000;">);
</span><span style="color: #008080;"> 52</span> imagedestroy(<span style="color: #800080;">$image</span><span style="color: #000000;">);
</span><span style="color: #008080;"> 53</span> <span style="color: #0000ff;">return</span> <span style="color: #800080;">$n_image</span><span style="color: #000000;">;
</span><span style="color: #008080;"> 54</span> <span style="color: #000000;"> }
</span><span style="color: #008080;"> 55</span> imagego("img/1.jpg", "imagethumb", <span style="color: #0000ff;">array</span>(1.5<span style="color: #000000;">));
</span><span style="color: #008080;"> 56</span> imagego("img/2.gif", "imagethumb", <span style="color: #0000ff;">array</span>(1.5<span style="color: #000000;">));
</span><span style="color: #008080;"> 57</span> imagego("img/3.png", "imagethumb", <span style="color: #0000ff;">array</span>(1.5<span style="color: #000000;">));
</span><span style="color: #008080;"> 58</span> <span style="color: #008000;">//</span><span style="color: #008000;">该方法用于实现图片的裁剪</span>
<span style="color: #008080;"> 59</span> <span style="color: #0000ff;">function</span> imagecut(<span style="color: #800080;">$image</span>, <span style="color: #800080;">$width</span>, <span style="color: #800080;">$height</span>, <span style="color: #800080;">$type</span>, <span style="color: #800080;">$vars</span><span style="color: #000000;">) {
</span><span style="color: #008080;"> 60</span> <span style="color: #800080;">$n_x</span> = <span style="color: #800080;">$vars</span>{0<span style="color: #000000;">};
</span><span style="color: #008080;"> 61</span> <span style="color: #800080;">$n_y</span> = <span style="color: #800080;">$vars</span>{1<span style="color: #000000;">};
</span><span style="color: #008080;"> 62</span> <span style="color: #800080;">$n_width</span> = <span style="color: #800080;">$vars</span>{2<span style="color: #000000;">};
</span><span style="color: #008080;"> 63</span> <span style="color: #800080;">$n_height</span> = <span style="color: #800080;">$vars</span>{3<span style="color: #000000;">};
</span><span style="color: #008080;"> 64</span>
<span style="color: #008080;"> 65</span> <span style="color: #800080;">$n_image</span> = imagecreatetruecolor(<span style="color: #800080;">$n_width</span>, <span style="color: #800080;">$n_height</span><span style="color: #000000;">);
</span><span style="color: #008080;"> 66</span> imagecopyresampled(<span style="color: #800080;">$n_image</span>, <span style="color: #800080;">$image</span>, 0, 0, <span style="color: #800080;">$n_x</span>, <span style="color: #800080;">$n_y</span>, <span style="color: #800080;">$n_width</span>, <span style="color: #800080;">$n_height</span>, <span style="color: #800080;">$n_width</span>, <span style="color: #800080;">$n_height</span><span style="color: #000000;">);
</span><span style="color: #008080;"> 67</span> imagedestroy(<span style="color: #800080;">$image</span><span style="color: #000000;">);
</span><span style="color: #008080;"> 68</span> <span style="color: #0000ff;">return</span> <span style="color: #800080;">$n_image</span><span style="color: #000000;">;
</span><span style="color: #008080;"> 69</span> <span style="color: #000000;"> }
</span><span style="color: #008080;"> 70</span> imagego("img/1.jpg", "imagecut", <span style="color: #0000ff;">array</span>(200, 100, 100, 100<span style="color: #000000;">));
</span><span style="color: #008080;"> 71</span> imagego("img/2.gif", "imagecut", <span style="color: #0000ff;">array</span>(200, 100, 100, 100<span style="color: #000000;">));
</span><span style="color: #008080;"> 72</span> imagego("img/3.png", "imagecut", <span style="color: #0000ff;">array</span>(200, 100, 100, 100<span style="color: #000000;">));
</span><span style="color: #008080;"> 73</span>
<span style="color: #008080;"> 74</span> <span style="color: #008000;">//</span><span style="color: #008000;">3. 添加图片水印</span>
<span style="color: #008080;"> 75</span> <span style="color: #008000;">/*</span><span style="color: #008000;"> imagecopy($dst_img,$src_img,$dst_x,$dst_y,$src_x,$src_y,$src_w,$src_h)
</span><span style="color: #008080;"> 76</span> <span style="color: #008000;"> * 将一个图片复制到另一个图片上面
</span><span style="color: #008080;"> 77</span> <span style="color: #008000;">*/</span>
<span style="color: #008080;"> 78</span> <span style="color: #0000ff;">function</span> watermark(<span style="color: #800080;">$image</span>, <span style="color: #800080;">$width</span>, <span style="color: #800080;">$height</span>, <span style="color: #800080;">$type</span>, <span style="color: #800080;">$vars</span><span style="color: #000000;">){
</span><span style="color: #008080;"> 79</span> <span style="color: #800080;">$w_image</span> = imagecreatefrompng("img/logo.png"<span style="color: #000000;">);
</span><span style="color: #008080;"> 80</span> <span style="color: #0000ff;">list</span>(<span style="color: #800080;">$src_w</span>, <span style="color: #800080;">$src_h</span>) = <span style="color: #008080;">getimagesize</span>("img/logo.png"<span style="color: #000000;">);
</span><span style="color: #008080;"> 81</span> imagecopy(<span style="color: #800080;">$image</span>, <span style="color: #800080;">$w_image</span>, <span style="color: #800080;">$vars</span>{0}, <span style="color: #800080;">$vars</span>{1}, 0, 0, <span style="color: #800080;">$src_w</span>, <span style="color: #800080;">$src_h</span><span style="color: #000000;">);
</span><span style="color: #008080;"> 82</span> imagedestroy(<span style="color: #800080;">$w_image</span><span style="color: #000000;">);
</span><span style="color: #008080;"> 83</span> <span style="color: #0000ff;">return</span> <span style="color: #800080;">$image</span><span style="color: #000000;">;
</span><span style="color: #008080;"> 84</span> <span style="color: #000000;"> }
</span><span style="color: #008080;"> 85</span> imagego("img/1.jpg", "watermark", <span style="color: #0000ff;">array</span>(50,50<span style="color: #000000;">));
</span><span style="color: #008080;"> 86</span> imagego("img/2.gif", "watermark", <span style="color: #0000ff;">array</span>(100,100<span style="color: #000000;">));
</span><span style="color: #008080;"> 87</span> imagego("img/3.png", "watermark", <span style="color: #0000ff;">array</span>(150,150<span style="color: #000000;">));
</span><span style="color: #008080;"> 88</span>
<span style="color: #008080;"> 89</span> <span style="color: #008000;">//</span><span style="color: #008000;">4. 图片的选装和翻转</span>
<span style="color: #008080;"> 90</span> <span style="color: #008000;">/*</span><span style="color: #008000;"> imagerotate($src,$degree,$bgcolor,[ignore transparent]) 可选参数是否忽视透明色,返回旋转后的图片
</span><span style="color: #008080;"> 91</span> <span style="color: #008000;"> * 翻转用imagecopy按像素行或者像素列复制就可以了
</span><span style="color: #008080;"> 92</span> <span style="color: #008000;"> * 下面的函数先旋转再翻转
</span><span style="color: #008080;"> 93</span> <span style="color: #008000;">*/</span>
<span style="color: #008080;"> 94</span> <span style="color: #0000ff;">function</span> rotateandturn(<span style="color: #800080;">$image</span>, <span style="color: #800080;">$width</span>, <span style="color: #800080;">$height</span>, <span style="color: #800080;">$type</span>, <span style="color: #800080;">$vars</span><span style="color: #000000;">) {
</span><span style="color: #008080;"> 95</span> <span style="color: #800080;">$angle</span> = <span style="color: #800080;">$vars</span>{0<span style="color: #000000;">};
</span><span style="color: #008080;"> 96</span> <span style="color: #800080;">$image</span> = imagerotate(<span style="color: #800080;">$image</span>, <span style="color: #800080;">$angle</span>, 0<span style="color: #000000;">);
</span><span style="color: #008080;"> 97</span> <span style="color: #008000;">//</span><span style="color: #008000;">选装后图片大小可能发生变化</span>
<span style="color: #008080;"> 98</span> <span style="color: #800080;">$width</span> = imagesx(<span style="color: #800080;">$image</span><span style="color: #000000;">);
</span><span style="color: #008080;"> 99</span> <span style="color: #800080;">$height</span> = imagesy(<span style="color: #800080;">$image</span><span style="color: #000000;">);
</span><span style="color: #008080;">100</span> <span style="color: #800080;">$n_image</span> = imagecreatetruecolor(<span style="color: #800080;">$width</span>, <span style="color: #800080;">$height</span><span style="color: #000000;">);
</span><span style="color: #008080;">101</span> <span style="color: #008000;">//</span><span style="color: #008000;">1代表x轴翻转,2代表y轴翻转,0代表不翻转</span>
<span style="color: #008080;">102</span> <span style="color: #0000ff;">if</span> (<span style="color: #800080;">$vars</span>{1} == 1<span style="color: #000000;">) {
</span><span style="color: #008080;">103</span> <span style="color: #0000ff;">for</span> (<span style="color: #800080;">$x</span> = 0; <span style="color: #800080;">$x</span> $width; <span style="color: #800080;">$x</span>++<span style="color: #000000;">) {
</span><span style="color: #008080;">104</span> imagecopy(<span style="color: #800080;">$n_image</span>, <span style="color: #800080;">$image</span>, <span style="color: #800080;">$x</span>, 0, <span style="color: #800080;">$width</span>-<span style="color: #800080;">$x</span>-1, 0, 1, <span style="color: #800080;">$height</span><span style="color: #000000;">);
</span><span style="color: #008080;">105</span> <span style="color: #000000;"> }
</span><span style="color: #008080;">106</span> } <span style="color: #0000ff;">else</span> <span style="color: #0000ff;">if</span> (<span style="color: #800080;">$vars</span>{1} == 2<span style="color: #000000;">){
</span><span style="color: #008080;">107</span> <span style="color: #0000ff;">for</span> (<span style="color: #800080;">$x</span> = 0; <span style="color: #800080;">$x</span> $height; <span style="color: #800080;">$x</span>++<span style="color: #000000;">) {
</span><span style="color: #008080;">108</span> imagecopy(<span style="color: #800080;">$n_image</span>, <span style="color: #800080;">$image</span>, 0, <span style="color: #800080;">$x</span>, 0, <span style="color: #800080;">$height</span>-<span style="color: #800080;">$x</span>-1, <span style="color: #800080;">$width</span>, 1<span style="color: #000000;">);
</span><span style="color: #008080;">109</span> <span style="color: #000000;"> }
</span><span style="color: #008080;">110</span> } <span style="color: #0000ff;">else</span><span style="color: #000000;"> {
</span><span style="color: #008080;">111</span> imagecopy(<span style="color: #800080;">$n_image</span>, <span style="color: #800080;">$image</span>, 0, 0, 0, 0, <span style="color: #800080;">$width</span>, <span style="color: #800080;">$height</span><span style="color: #000000;">);
</span><span style="color: #008080;">112</span> <span style="color: #000000;"> }
</span><span style="color: #008080;">113</span>
<span style="color: #008080;">114</span> imagedestroy(<span style="color: #800080;">$image</span><span style="color: #000000;">);
</span><span style="color: #008080;">115</span> <span style="color: #0000ff;">return</span> <span style="color: #800080;">$n_image</span><span style="color: #000000;">;
</span><span style="color: #008080;">116</span> <span style="color: #000000;"> }
</span><span style="color: #008080;">117</span> imagego("img/1.jpg", "rotateandturn", <span style="color: #0000ff;">array</span>(10, 0<span style="color: #000000;">));
</span><span style="color: #008080;">118</span> imagego("img/2.gif", "rotateandturn", <span style="color: #0000ff;">array</span>(0,1<span style="color: #000000;">));
</span><span style="color: #008080;">119</span> imagego("img/3.png", "rotateandturn", <span style="color: #0000ff;">array</span>(10,2<span style="color: #000000;">));
</span><span style="color: #008080;">120</span> ?>
<span style="color: #008080;">121</span>
<span style="color: #008080;">122</span>
<span style="color: #008080;">123</span> 原图<br>
<span style="color: #008080;">124</span> <img src="/static/imghw/default1.png" data-src="img/1.jpg" class="lazy" alt=""><img src="/static/imghw/default1.png" data-src="img/2.gif" class="lazy" alt=""><img src="/static/imghw/default1.png" data-src="img/3.png" class="lazy" alt="">
<span style="color: #008080;">125</span> <br>图中添加字符串<br>
<span style="color: #008080;">126</span> <img src="/static/imghw/default1.png" data-src="img/1_imageaddstring.jpg" class="lazy" alt=""><img src="/static/imghw/default1.png" data-src="img/2_imageaddstring.gif" class="lazy" alt=""><img src="/static/imghw/default1.png" data-src="img/3_imageaddstring.png" class="lazy" alt="">
<span style="color: #008080;">127</span> <br>图片缩放<br>
<span style="color: #008080;">128</span> <img src="/static/imghw/default1.png" data-src="img/1_imagethumb.jpg" class="lazy" alt=""><img src="/static/imghw/default1.png" data-src="img/2_imagethumb.gif" class="lazy" alt=""><img src="/static/imghw/default1.png" data-src="img/3_imagethumb.png" class="lazy" alt="">
<span style="color: #008080;">129</span> <br>图片裁剪<br>
<span style="color: #008080;">130</span> <img src="/static/imghw/default1.png" data-src="img/1_imagecut.jpg" class="lazy" alt=""><img src="/static/imghw/default1.png" data-src="img/2_imagecut.gif" class="lazy" alt=""><img src="/static/imghw/default1.png" data-src="img/3_imagecut.png" class="lazy" alt="">
<span style="color: #008080;">131</span> <br>图片水印<br>
<span style="color: #008080;">132</span> <img src="/static/imghw/default1.png" data-src="img/1_watermark.jpg" class="lazy" alt=""><img src="/static/imghw/default1.png" data-src="img/2_watermark.gif" class="lazy" alt=""><img src="/static/imghw/default1.png" data-src="img/3_watermark.png" class="lazy" alt="">
<span style="color: #008080;">133</span> <br>图片旋转和翻转<br>
<span style="color: #008080;">134</span> <img src="/static/imghw/default1.png" data-src="img/1_rotateandturn.jpg" class="lazy" alt=""><img src="/static/imghw/default1.png" data-src="img/2_rotateandturn.gif" class="lazy" alt=""><img src="/static/imghw/default1.png" data-src="img/3_rotateandturn.png" class="lazy" alt="">
<span style="color: #008080;">135</span>
<span style="color: #008080;">136</span>
<span style="color: #008080;">137</span> Copy after login
执行结果
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
What's New in Windows 11 KB5054979 & How to Fix Update Issues
3 weeks ago
By DDD
How to fix KB5055523 fails to install in Windows 11?
2 weeks ago
By DDD
InZoi: How To Apply To School And University
3 weeks ago
By DDD
How to fix KB5055518 fails to install in Windows 10?
2 weeks ago
By DDD
Roblox: Dead Rails – How To Summon And Defeat Nikola Tesla
4 weeks ago
By 尊渡假赌尊渡假赌尊渡假赌
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
Explain JSON Web Tokens (JWT) and their use case in PHP APIs.
Apr 05, 2025 am 12:04 AM
JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,
Explain late static binding in PHP (static::).
Apr 03, 2025 am 12:04 AM
Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.
What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases?
Apr 03, 2025 am 12:03 AM
What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.
PHP and Python: Comparing Two Popular Programming Languages
Apr 14, 2025 am 12:13 AM
PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.
Demystifying JavaScript: What It Does and Why It Matters
Apr 09, 2025 am 12:07 AM
JavaScript is the cornerstone of modern web development, and its main functions include event-driven programming, dynamic content generation and asynchronous programming. 1) Event-driven programming allows web pages to change dynamically according to user operations. 2) Dynamic content generation allows page content to be adjusted according to conditions. 3) Asynchronous programming ensures that the user interface is not blocked. JavaScript is widely used in web interaction, single-page application and server-side development, greatly improving the flexibility of user experience and cross-platform development.
PHP: A Key Language for Web Development
Apr 13, 2025 am 12:08 AM
PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7
Explain the match expression (PHP 8 ) and how it differs from switch.
Apr 06, 2025 am 12:03 AM
In PHP8, match expressions are a new control structure that returns different results based on the value of the expression. 1) It is similar to a switch statement, but returns a value instead of an execution statement block. 2) The match expression is strictly compared (===), which improves security. 3) It avoids possible break omissions in switch statements and enhances the simplicity and readability of the code.
What is Cross-Site Request Forgery (CSRF) and how do you implement CSRF protection in PHP?
Apr 07, 2025 am 12:02 AM
In PHP, you can effectively prevent CSRF attacks by using unpredictable tokens. Specific methods include: 1. Generate and embed CSRF tokens in the form; 2. Verify the validity of the token when processing the request.
