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Explain to you the specific method of adding watermark to images in PHP_PHP Tutorial
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PHP Tutorial
Explain to you the specific method of adding watermark to images in PHP_PHP Tutorial
Explain to you the specific method of adding watermark to images in PHP_PHP Tutorial
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watermark
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When we are building a website, we will all encounter the need to add watermarks to the pictures uploaded on the website. It will definitely be very troublesome and impractical to add watermarks one by one manually. So, today we will accept the specific method of adding watermark to pictures in PHP and simplify the steps.
- The specific code to add watermark to the picture is as follows:
<ol class="dp-xml"> <li class="alt"> <span><strong><font color="#006699"><span class="tag"><?</SPAN><SPAN class=tag-name>php</SPAN></FONT></STRONG><SPAN> </SPAN></SPAN><LI class=""><SPAN>/****************************************************************************** </SPAN><LI class=alt><SPAN> </SPAN><LI class=""><SPAN>参数说明: </SPAN><LI class=alt><SPAN>$max_file_size : 上传文件大小限制, 单位BYTE </SPAN><LI class=""><SPAN>$destination_folder : 上传文件路径 </SPAN><LI class=alt><SPAN>$watermark : 是否附加水印(1为加水印,其他为不加水印); </SPAN><LI class=""><SPAN> </SPAN><LI class=alt><SPAN>使用说明: </SPAN><LI class=""><SPAN>1. 将PHP.INI文件里面的"</SPAN><SPAN class=attribute><FONT color=#ff0000>extension</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>php_gd2</FONT></SPAN><SPAN>.dll"一行前面的;号去掉,因为我们要用到GD库; </SPAN></SPAN><LI class=alt><SPAN>2. 将</SPAN><SPAN class=attribute><FONT color=#ff0000>extension_dir</FONT></SPAN><SPAN> =改为你的php_gd2.dll所在目录; </SPAN></SPAN><LI class=""><SPAN>******************************************************************************/ </SPAN><LI class=alt><SPAN> </SPAN><LI class=""><SPAN>//上传文件类型列表 </SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>uptypes</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>array</FONT></SPAN><SPAN>( </SPAN></SPAN><LI class=""><SPAN> 'image/jpg', </SPAN><LI class=alt><SPAN> 'image/jpeg', </SPAN><LI class=""><SPAN> 'image/png', </SPAN><LI class=alt><SPAN> 'image/pjpeg', </SPAN><LI class=""><SPAN> 'image/gif', </SPAN><LI class=alt><SPAN> 'image/bmp', </SPAN><LI class=""><SPAN> 'image/x-png' </SPAN><LI class=alt><SPAN>); </SPAN><LI class=""><SPAN> </SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>max_file_size</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>2000000</FONT></SPAN><SPAN>; //上传文件大小限制, 单位BYTE </SPAN></SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>destination_folder</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>"uploadimg/"</FONT></SPAN><SPAN>; //上传文件路径 </SPAN></SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>watermark</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>1</FONT></SPAN><SPAN>; //是否附加水印(1为加水印,其他为不加水印); </SPAN></SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>watertype</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>1</FONT></SPAN><SPAN>; //水印类型(1为文字,2为图片) </SPAN></SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>waterposition</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>1</FONT></SPAN><SPAN>; //水印位置(1为左下角,2为右下角,3为左上角,4为右上角,5为居中); </SPAN></SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>waterstring</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>"http://www.xplore.cn/"</FONT></SPAN><SPAN>; //水印字符串 </SPAN></SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>waterimg</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>"xplore.gif"</FONT></SPAN><SPAN>; //水印图片 </SPAN></SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>imgpreview</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>1</FONT></SPAN><SPAN>; //是否生成预览图(1为生成,其他为不生成); </SPAN></SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>imgpreviewsize</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>1</FONT></SPAN><SPAN>/2; //缩略图比例 </SPAN></SPAN><LI class=""><SPAN></SPAN><SPAN class=tag><STRONG><FONT color=#006699>?></span></font></strong></span><span> </span> </li> <li class="alt"> <span></span><strong><font color="#006699"><span class="tag"><</SPAN><SPAN class=tag-name>html</SPAN><SPAN class=tag>></span></font></strong><span> </span> </li> <li class=""> <span></span><strong><font color="#006699"><span class="tag"><</SPAN><SPAN class=tag-name>head</SPAN><SPAN class=tag>></span></font></strong><span> </span> </li> <li class="alt"> <span></span><strong><font color="#006699"><span class="tag"><</SPAN><SPAN class=tag-name>title</SPAN><SPAN class=tag>></span></font></strong><span>ZwelL图片上传程序</span><strong><font color="#006699"><span class="tag"></</SPAN><SPAN class=tag-name>title</SPAN><SPAN class=tag>></span></font></strong><span> </span> </li> <li class=""> <span></span><strong><font color="#006699"><span class="tag"><</SPAN><SPAN class=tag-name>style</SPAN></FONT></STRONG><SPAN> </SPAN><SPAN class=attribute><FONT color=#ff0000>type</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>"text/css"</FONT></SPAN><SPAN class=tag><STRONG><FONT color=#006699>></span></font></strong><span> </span> </li> <li class="alt"> <span><!-- </SPAN><LI class=""><SPAN>body </SPAN><LI class=alt><SPAN>{ </SPAN><LI class=""><SPAN> font-size: 9pt; </SPAN><LI class=alt><SPAN>} </SPAN><LI class=""><SPAN>input </SPAN><LI class=alt><SPAN>{ </SPAN><LI class=""><SPAN> background-color: #66CCFF; </SPAN><LI class=alt><SPAN> border: 1px inset #CCCCCC; </SPAN><LI class=""><SPAN>} </SPAN><LI class=alt><SPAN>--</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></span><span> </span> </li> <li class=""> <span></span><strong><font color="#006699"><span class="tag"></</SPAN><SPAN class=tag-name>style</SPAN><SPAN class=tag>></span></font></strong><span> </span> </li> <li class="alt"> <span></span><strong><font color="#006699"><span class="tag"></</SPAN><SPAN class=tag-name>head</SPAN><SPAN class=tag>></span></font></strong><span> </span> </li> <li class=""><span> </span></li> <li class="alt"> <span></span><strong><font color="#006699"><span class="tag"><</SPAN><SPAN class=tag-name>body</SPAN><SPAN class=tag>></span></font></strong><span> </span> </li> <li class=""> <span></span><strong><font color="#006699"><span class="tag"><</SPAN><SPAN class=tag-name>form</SPAN></FONT></STRONG><SPAN> </SPAN><SPAN class=attribute><FONT color=#ff0000>enctype</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>"multipart/form-data"</FONT></SPAN><SPAN> </SPAN><SPAN class=attribute><FONT color=#ff0000>method</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>"post"</FONT></SPAN><SPAN> </SPAN><SPAN class=attribute><FONT color=#ff0000>name</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>"upform"</FONT></SPAN><SPAN class=tag><STRONG><FONT color=#006699>></span></font></strong><span> </span> </li> <li class="alt"><span> 上传文件: </span></li> <li class=""> <span> </span><strong><font color="#006699"><span class="tag"><</SPAN><SPAN class=tag-name>input</SPAN></FONT></STRONG><SPAN> </SPAN><SPAN class=attribute><FONT color=#ff0000>name</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>"upfile"</FONT></SPAN><SPAN> </SPAN><SPAN class=attribute><FONT color=#ff0000>type</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>"file"</FONT></SPAN><SPAN class=tag><STRONG><FONT color=#006699>></span></font></strong><span> </span> </li> <li class="alt"> <span> </span><strong><font color="#006699"><span class="tag"><</SPAN><SPAN class=tag-name>input</SPAN></FONT></STRONG><SPAN> </SPAN><SPAN class=attribute><FONT color=#ff0000>type</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>"submit"</FONT></SPAN><SPAN> </SPAN><SPAN class=attribute><FONT color=#ff0000>value</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>"上传"</FONT></SPAN><STRONG><FONT color=#006699><SPAN class=tag>></span><span class="tag"><</SPAN><SPAN class=tag-name>br</SPAN><SPAN class=tag>></span></font></strong><span> </span> </li> <li class=""> <span> 允许上传的文件类型为:</span><span class="tag"><strong><font color="#006699"><?</FONT></STRONG></SPAN><SPAN>=implode(', ',$uptypes)</SPAN><SPAN class=tag><STRONG><FONT color=#006699>?></font></strong></span><span> </span> </li> <li class="alt"> <span></span><strong><font color="#006699"><span class="tag"></</SPAN><SPAN class=tag-name>form</SPAN><SPAN class=tag>></span></font></strong><span> </span> </li> <li class=""><span> </span></li> <li class="alt"> <span></span><strong><font color="#006699"><span class="tag"><?</SPAN><SPAN class=tag-name>php</SPAN></FONT></STRONG><SPAN> </SPAN></SPAN><LI class=""><SPAN>if ($_SERVER['REQUEST_METHOD'] == 'POST') </SPAN><LI class=alt><SPAN>{ </SPAN><LI class=""><SPAN> if (!is_uploaded_file($_FILES["upfile"][tmp_name])) </SPAN><LI class=alt><SPAN> //是否存在文件 </SPAN><LI class=""><SPAN> { </SPAN><LI class=alt><SPAN> echo "图片不存在!"; </SPAN><LI class=""><SPAN> exit; </SPAN><LI class=alt><SPAN> } </SPAN><LI class=""><SPAN> </SPAN><LI class=alt><SPAN> $</SPAN><SPAN class=attribute><FONT color=#ff0000>file</FONT></SPAN><SPAN> = $_FILES["upfile"]; </SPAN></SPAN><LI class=""><SPAN> if($max_file_size </SPAN><SPAN class=tag><STRONG><FONT color=#006699><</FONT></STRONG></SPAN><SPAN> $file["size"]) </SPAN></SPAN><LI class=alt><SPAN> //检查文件大小 </SPAN><LI class=""><SPAN> { </SPAN><LI class=alt><SPAN> echo "文件太大!"; </SPAN><LI class=""><SPAN> exit; </SPAN><LI class=alt><SPAN> } </SPAN><LI class=""><SPAN> </SPAN><LI class=alt><SPAN> if(!in_array($file["type"], $uptypes)) </SPAN><LI class=""><SPAN> //检查文件类型 </SPAN><LI class=alt><SPAN> { </SPAN><LI class=""><SPAN> echo "文件类型不符!".$file["type"]; </SPAN><LI class=alt><SPAN> exit; </SPAN><LI class=""><SPAN> } </SPAN><LI class=alt><SPAN> </SPAN><LI class=""><SPAN> if(!file_exists($destination_folder)) </SPAN><LI class=alt><SPAN> { </SPAN><LI class=""><SPAN> mkdir($destination_folder); </SPAN><LI class=alt><SPAN> } </SPAN><LI class=""><SPAN> </SPAN><LI class=alt><SPAN> $</SPAN><SPAN class=attribute><FONT color=#ff0000>filename</FONT></SPAN><SPAN>=$file["tmp_name"]; </SPAN></SPAN><LI class=""><SPAN> $</SPAN><SPAN class=attribute><FONT color=#ff0000>image_size</FONT></SPAN><SPAN> = </SPAN><SPAN class=attribute-value><FONT color=#0000ff>getimagesize</FONT></SPAN><SPAN>($filename); </SPAN></SPAN><LI class=alt><SPAN> $</SPAN><SPAN class=attribute><FONT color=#ff0000>pinfo</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>pathinfo</FONT></SPAN><SPAN>($file["name"]); </SPAN></SPAN><LI class=""><SPAN> $</SPAN><SPAN class=attribute><FONT color=#ff0000>ftype</FONT></SPAN><SPAN>=$pinfo['extension']; </SPAN></SPAN><LI class=alt><SPAN> $</SPAN><SPAN class=attribute><FONT color=#ff0000>destination</FONT></SPAN><SPAN> = $destination_folder.time().".".$ftype; </SPAN></SPAN><LI class=""><SPAN> if (file_exists($destination) && $overwrite != true) </SPAN><LI class=alt><SPAN> { </SPAN><LI class=""><SPAN> echo "同名文件已经存在了"; </SPAN><LI class=alt><SPAN> exit; </SPAN><LI class=""><SPAN> } </SPAN><LI class=alt><SPAN> </SPAN><LI class=""><SPAN> if(!move_uploaded_file ($filename, $destination)) </SPAN><LI class=alt><SPAN> { </SPAN><LI class=""><SPAN> echo "移动文件出错"; </SPAN><LI class=alt><SPAN> exit; </SPAN><LI class=""><SPAN> } </SPAN><LI class=alt><SPAN> </SPAN><LI class=""><SPAN> $</SPAN><SPAN class=attribute><FONT color=#ff0000>pinfo</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>pathinfo</FONT></SPAN><SPAN>($destination); </SPAN></SPAN><LI class=alt><SPAN> $</SPAN><SPAN class=attribute><FONT color=#ff0000>fname</FONT></SPAN><SPAN>=$pinfo[basename]; </SPAN></SPAN><LI class=""><SPAN> echo " </SPAN><STRONG><FONT color=#006699><SPAN class=tag><</SPAN><SPAN class=tag-name>font</SPAN></FONT></STRONG><SPAN> </SPAN><SPAN class=attribute><FONT color=#ff0000>color</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>red</FONT></SPAN><SPAN class=tag><STRONG><FONT color=#006699>></span></font></strong><span>已经成功上传</span><strong><font color="#006699"><span class="tag"></</SPAN><SPAN class=tag-name>font</SPAN><SPAN class=tag>></span><span class="tag"><</SPAN><SPAN class=tag-name>br</SPAN><SPAN class=tag>></span></font></strong><span>文件名: </span><strong><font color="#006699"><span class="tag"><</SPAN><SPAN class=tag-name>font</SPAN></FONT></STRONG><SPAN> </SPAN><SPAN class=attribute><FONT color=#ff0000>color</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>blue</FONT></SPAN><SPAN class=tag><STRONG><FONT color=#006699>></span></font></strong><span>".$destination_folder.$fname."</span><strong><font color="#006699"><span class="tag"></</SPAN><SPAN class=tag-name>font</SPAN><SPAN class=tag>></span><span class="tag"><</SPAN><SPAN class=tag-name>br</SPAN><SPAN class=tag>></span></font></strong><span>"; </span> </li> <li class="alt"><span> echo " 宽度:".$image_size[0]; </span></li> <li class=""><span> echo " 长度:".$image_size[1]; </span></li> <li class="alt"> <span> echo "</span><strong><font color="#006699"><span class="tag"><</SPAN><SPAN class=tag-name>br</SPAN><SPAN class=tag>></span></font></strong><span> 大小:".$file["size"]." bytes"; </span> </li> <li class=""><span> </span></li> <li class="alt"> <span> if($</span><span class="attribute"><font color="#ff0000">watermark</font></span><span>==1) </span> </li> <li class=""><span> { </span></li> <li class="alt"> <span> $</span><span class="attribute"><font color="#ff0000">iinfo</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">getimagesize</font></span><span>($destination,$iinfo); </span> </li> <li class=""> <span> $</span><span class="attribute"><font color="#ff0000">nimage</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">imagecreatetruecolor</font></span><span>($image_size[0],$image_size[1]); </span> </li> <li class="alt"> <span> $</span><span class="attribute"><font color="#ff0000">white</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">imagecolorallocate</font></span><span>($nimage,255,255,255); </span> </li> <li class=""> <span> $</span><span class="attribute"><font color="#ff0000">black</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">imagecolorallocate</font></span><span>($nimage,0,0,0); </span> </li> <li class="alt"> <span> $</span><span class="attribute"><font color="#ff0000">red</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">imagecolorallocate</font></span><span>($nimage,255,0,0); </span> </li> <li class=""><span> imagefill($nimage,0,0,$white); </span></li> <li class="alt"><span> switch ($iinfo[2]) </span></li> <li class=""><span> { </span></li> <li class="alt"><span> case 1: </span></li> <li class=""> <span> $</span><span class="attribute"><font color="#ff0000">simage</font></span><span> =</span><span class="attribute-value"><font color="#0000ff">imagecreatefromgif</font></span><span>($destination); </span> </li> <li class="alt"><span> break; </span></li> <li class=""><span> case 2: </span></li> <li class="alt"> <span> $</span><span class="attribute"><font color="#ff0000">simage</font></span><span> =</span><span class="attribute-value"><font color="#0000ff">imagecreatefromjpeg</font></span><span>($destination); </span> </li> <li class=""><span> break; </span></li> <li class="alt"><span> case 3: </span></li> <li class=""> <span> $</span><span class="attribute"><font color="#ff0000">simage</font></span><span> =</span><span class="attribute-value"><font color="#0000ff">imagecreatefrompng</font></span><span>($destination); </span> </li> <li class="alt"><span> break; </span></li> <li class=""><span> case 6: </span></li> <li class="alt"> <span> $</span><span class="attribute"><font color="#ff0000">simage</font></span><span> =</span><span class="attribute-value"><font color="#0000ff">imagecreatefromwbmp</font></span><span>($destination); </span> </li> <li class=""><span> break; </span></li> <li class="alt"><span> default: </span></li> <li class=""><span> die("不支持的文件类型"; </span></li> <li class="alt"><span> exit; </span></li> <li class=""><span> } </span></li> <li class="alt"><span> </span></li> <li class=""><span> imagecopy($nimage,$simage,0,0,0,0,$image_size[0],$image_size[1]); </span></li> <li class="alt"><span> imagefilledrectangle($nimage,1,$image_size[1]-15,80,$image_size[1],$white); </span></li> <li class=""><span> </span></li> <li class="alt"><span> switch($watertype) </span></li> <li class=""><span> { </span></li> <li class="alt"><span> case 1: //加水印字符串 </span></li> <li class=""><span> imagestring($nimage,2,3,$image_size[1]-15,$waterstring,$black); </span></li> <li class="alt"><span> break; </span></li> <li class=""><span> case 2: //加水印图片 </span></li> <li class="alt"> <span> $</span><span class="attribute"><font color="#ff0000">simage1</font></span><span> =</span><span class="attribute-value"><font color="#0000ff">imagecreatefromgif</font></span><span>("xplore.gif"; </span> </li> <li class=""><span> imagecopy($nimage,$simage1,0,0,0,0,85,15); </span></li> <li class="alt"><span> imagedestroy($simage1); </span></li> <li class=""><span> break; </span></li> <li class="alt"><span> } </span></li> <li class=""><span> </span></li> <li class="alt"><span> switch ($iinfo[2]) </span></li> <li class=""><span> { </span></li> <li class="alt"><span> case 1: </span></li> <li class=""><span> //imagegif($nimage, $destination); </span></li> <li class="alt"><span> imagejpeg($nimage, $destination); </span></li> <li class=""><span> break; </span></li> <li class="alt"><span> case 2: </span></li> <li class=""><span> imagejpeg($nimage, $destination); </span></li> <li class="alt"><span> break; </span></li> <li class=""><span> case 3: </span></li> <li class="alt"><span> imagepng($nimage, $destination); </span></li> <li class=""><span> break; </span></li> <li class="alt"><span> case 6: </span></li> <li class=""><span> imagewbmp($nimage, $destination); </span></li> <li class="alt"><span> //imagejpeg($nimage, $destination); </span></li> <li class=""><span> break; </span></li> <li class="alt"><span> } </span></li> <li class=""><span> </span></li> <li class="alt"><span> //覆盖原上传文件 </span></li> <li class=""><span> imagedestroy($nimage); </span></li> <li class="alt"><span> imagedestroy($simage); </span></li> <li class=""><span> } </span></li> <li class="alt"><span> </span></li> <li class=""> <span> if($</span><span class="attribute"><font color="#ff0000">imgpreview</font></span><span>==1) </span> </li> <li class="alt"><span> { </span></li> <li class=""> <span> echo "</span><strong><font color="#006699"><span class="tag"><</SPAN><SPAN class=tag-name>br</SPAN><SPAN class=tag>></span></font></strong><span>图片预览:</span><strong><font color="#006699"><span class="tag"><</SPAN><SPAN class=tag-name>br</SPAN><SPAN class=tag>></span></font></strong><span>"; </span> </li> <li class="alt"> <span> echo "</span><strong><font color="#006699"><span class="tag"><</SPAN><SPAN class=tag-name>img</SPAN></FONT></STRONG><SPAN> </SPAN><SPAN class=attribute><FONT color=#ff0000>src</FONT></SPAN><SPAN>="".$destination."" </SPAN><SPAN class=attribute><FONT color=#ff0000>width</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>".($image_size[0]*$imgpreviewsize)."</FONT></SPAN><SPAN> </SPAN><SPAN class=attribute><FONT color=#ff0000>height</FONT></SPAN><SPAN>=".($image_size[1]*$imgpreviewsize); </SPAN></SPAN><LI class=""><SPAN> echo " </SPAN><SPAN class=attribute><FONT color=#ff0000>alt</FONT></SPAN><SPAN>="图片预览:r文件名:".$destination."r上传时间:"</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></span></font></strong><span>"; </span> </li> <li class="alt"><span> } </span></li> <li class=""><span>} </span></li> <li class="alt"> <span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span> </span> </li> <li class=""> <span></span><strong><font color="#006699"><span class="tag"></</SPAN><SPAN class=tag-name>body</SPAN><SPAN class=tag>></span></font></strong><span> </span> </li> <li class="alt"> <span></span><strong><font color="#006699"><span class="tag"></</SPAN><SPAN class=tag-name>html</SPAN><SPAN class=tag>></span></font></strong><span> </span> </li> </ol>Copy after loginThe above is the specific code for adding watermark to pictures in PHP that we provide for you. I hope it will be useful to you. Friends help.
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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,
PHP Program to Count Vowels in a String
Feb 07, 2025 pm 12:12 PM
A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total
How do you parse and process HTML/XML in PHP?
Feb 07, 2025 am 11:57 AM
This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an
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.
