php 中文字符串统计、截取
这几天复习基础时，看到字符串这一章，有个题目是给文章分页！ 如是就自己动手写写。本以为很简单的，结果却折腾了两天，期间老是东看西看，东做西做的，一点也不专注 //批评下自己 好在，终于弄出一个。只不过需要使用者自己传入当前的字符编码 o(╯□╰)o
这几天复习基础时，看到字符串这一章，有个题目是给文章分页！
如是就自己动手写写。本以为很简单的，结果却折腾了两天，期间老是东看西看，东做西做的，一点也不专注………… //批评下自己
好在，终于弄出一个。只不过需要使用者自己传入当前的字符编码
o(╯□╰)o。网上找到的都是利用各字符编码所在ASCII码中的十六进制区间来判断汉字………… //我承认我技术不行
下边是代码。 //写完之后就来发博客，巩固、加深印象 :-D
注：每个英文字母、汉字、特殊字符不管占多少字节，我这里始终按一个字符进行处理
<span> 1</span> <span>php
</span><span> 2</span> <span>header</span>("content-type:text/html; charset=utf-8"<span>);
</span><span> 3</span> <span>echo</span> '<pre class="brush:php;toolbar:false">'<span>;
</span><span> 4</span> <span>/*</span><span>*
</span><span> 5</span> <span> * 字符串统计，每个字符按一个长度计算
</span><span> 6</span> <span> * 支持GBK，UTF8
</span><span> 7</span> <span> * 类似mb_strlen()
</span><span> 8</span> <span> * @author 谭宁宁
</span><span> 9</span> <span> * @time 2012-08-05
</span><span> 10</span> <span>*/</span>
<span> 11</span> <span>if</span>( !<span>function_exists</span>('strcount'<span>))
</span><span> 12</span> <span>{
</span><span> 13</span> <span>function</span> strcount(<span>$string</span>, <span>$char</span>='utf8'<span>)
</span><span> 14</span> <span> {
</span><span> 15</span> <span>$count</span> = <span>strlen</span>(<span>$string</span><span>);
</span><span> 16</span> <span>$i</span> = 0; <span>//</span><span>当前的字节数</span>
<span> 17</span> <span>$j</span> = 0; <span>//</span><span>按照字符进行累加</span>
<span> 18</span> <span>while</span> (<span>$i</span>$count<span>)
</span><span> 19</span> <span> {
</span><span> 20</span> <span>//</span><span>英文及半角特殊字符</span>
<span> 21</span> <span>if</span>(<span>ord</span>(<span>$string</span>[<span>$i</span>]) >=0 && <span>ord</span>(<span>$string</span>[<span>$i</span>]) )
<span> 22</span> { <span>$charset</span> = 'en'<span>; }
</span><span> 23</span> <span>//</span><span>汉字及全角字符</span>
<span> 24</span> <span>else</span>
<span> 25</span> { <span>$charset</span> = <span>$char</span><span>;}
</span><span> 26</span>
<span> 27</span> <span>switch</span> (<span>strtolower</span>(<span>$charset</span><span>))
</span><span> 28</span> <span> {
</span><span> 29</span> <span>case</span> 'gb2312':
<span> 30</span> <span>case</span> 'gbk':
<span> 31</span> <span>$i</span> += 1<span>;
</span><span> 32</span> <span>break</span><span>;
</span><span> 33</span> <span>case</span> 'utf8':
<span> 34</span> <span>$i</span> += 2<span>;
</span><span> 35</span> <span>break</span><span>;
</span><span> 36</span> <span>case</span> 'en':
<span> 37</span> <span>default</span>:
<span> 38</span> <span>break</span><span>;
</span><span> 39</span> <span> }
</span><span> 40</span> <span>$j</span>++<span>;
</span><span> 41</span> <span>$i</span>++<span>;
</span><span> 42</span> <span> }
</span><span> 43</span> <span>return</span> <span>$j</span><span>;
</span><span> 44</span> <span> }
</span><span> 45</span> <span>}
</span><span> 46</span> <span>else</span>
<span> 47</span> { <span>echo</span> '<p>fun strcount exists!</p>'<span>; }
</span><span> 48</span>
<span> 49</span> <span>/*</span><span>*
</span><span> 50</span> <span> * 自定义字符串截取函数，防止mb_substr()没有开启
</span><span> 51</span> <span> * 通过用户输入的$char来判断当前汉字的字符集编码
</span><span> 52</span> <span> * @param int $start 开始的字符数
</span><span> 53</span> <span> * @param int $offest 偏移量，及从$start开始往后输出多少个字符
</span><span> 54</span> <span> * @param str $char 使用者手动输入当前的汉字符编码
</span><span> 55</span> <span> * @author 谭宁宁
</span><span> 56</span> <span> * @time 2012-08-05
</span><span> 57</span> <span>*/</span>
<span> 58</span> <span>if</span>( !<span>function_exists</span>('strsub'<span>))
</span><span> 59</span> <span>{
</span><span> 60</span> <span>function</span> strsub(<span>$string</span>, <span>$start</span>=0, <span>$offest</span>=0, <span>$char</span>='utf8'<span>)
</span><span> 61</span> <span> {
</span><span> 62</span> <span>$count</span> = <span>strlen</span>(<span>$string</span><span>);
</span><span> 63</span> <span>$rs</span> = ''<span>;
</span><span> 64</span> <span>$i</span> = 0; <span>//</span><span>按字节数累计</span>
<span> 65</span> <span>$j</span> = 0; <span>//</span><span>按字符数累计</span>
<span> 66</span> <span>$size</span> = 1; <span>//</span><span>记录每次substr时的终止位置，汉字需要考虑gbk和utf8两种情况</span>
<span> 67</span> <span>while</span> (<span>$i</span> $count<span>)
</span><span> 68</span> <span> {
</span><span> 69</span> <span>//</span><span>英文及半角特殊字符</span>
<span> 70</span> <span>if</span>(<span>ord</span>(<span>$string</span>[<span>$i</span>]) >=0 && <span>ord</span>(<span>$string</span>[<span>$i</span>]) )
<span> 71</span> { <span>$charset</span> = 'en'<span>; }
</span><span> 72</span> <span>//</span><span>汉字及全角字符</span>
<span> 73</span> <span>else</span>
<span> 74</span> { <span>$charset</span> = <span>$char</span><span>;}
</span><span> 75</span>
<span> 76</span> <span>switch</span> (<span>strtolower</span>(<span>$charset</span><span>))
</span><span> 77</span> <span> {
</span><span> 78</span> <span>case</span> 'gb2312':
<span> 79</span> <span>case</span> 'gbk':
<span> 80</span> <span>$i</span> += 1<span>;
</span><span> 81</span> <span>$size</span> = 2<span>;
</span><span> 82</span> <span>break</span><span>;
</span><span> 83</span> <span>case</span> 'utf8':
<span> 84</span> <span>$i</span> += 2<span>;
</span><span> 85</span> <span>$size</span> = 3<span>;
</span><span> 86</span> <span>break</span><span>;
</span><span> 87</span> <span>case</span> 'en':
<span> 88</span> <span>default</span>:
<span> 89</span> <span>$size</span> = 1<span>;
</span><span> 90</span> <span>break</span><span>;
</span><span> 91</span> <span> }
</span><span> 92</span>
<span> 93</span> <span>if</span>(<span>$j</span> intval(<span>$start</span>+<span>$offest</span>) && <span>$j</span> >= <span>$start</span><span>)
</span><span> 94</span> <span> {
</span><span> 95</span> <span>$tstart</span> = <span>intval</span>(<span>$i</span>-<span>$size</span>)+1<span>;
</span><span> 96</span> <span>$rs</span> .= <span>substr</span>(<span>$string</span>, <span>$tstart</span>, <span>$size</span><span>);
</span><span> 97</span> <span> }
</span><span> 98</span> <span>$j</span>++<span>;
</span><span> 99</span> <span>$i</span>++<span>;
</span><span>100</span> <span> }
</span><span>101</span> <span>return</span> <span>$rs</span><span>;
</span><span>102</span> <span> }
</span><span>103</span> <span>}
</span><span>104</span> <span>else</span>
<span>105</span> { <span>echo</span> '<p>fun strsub exists!</p>'<span>; }
</span><span>106</span>
<span>107</span> <span>/*</span><span>$string = '123456789汉字胡总温中文啊abcdefghijklmn·=-';
</span><span>108</span> <span>echo 'substr()：',substr($string, 9, 3),'<br>';
</span><span>109</span> <span>echo '长度：',strcount($string),'<br>';
</span><span>110</span> <span>echo '截取测试：',strsub($string, 0, 11),'<br>';</span><span>*/</span>
<span>111</span>
<span>112</span> <span>$fileContent</span> = <span>file_exists</span>('reg.txt') ? <span>file_get_contents</span>('reg.txt') : ''<span>;
</span><span>113</span>
<span>114</span> <span>$count</span> = strcount(<span>$fileContent</span><span>);
</span><span>115</span> <span>$page</span> = !<span>isset</span>(<span>$_GET</span>['p']) ? 1 : <span>$_GET</span>['p']; <span>//</span><span>获取当前页码，默认为1</span>
<span>116</span> <span>$pagesize</span> = 350; <span>//</span><span>每页多少字符</span>
<span>117</span> <span>$pagecount</span> = <span>$count</span>/<span>$pagesize</span><span>;
</span><span>118</span> <span>$pagecount</span> = <span>strpos</span>(<span>$pagecount</span>, '.') ? <span>intval</span>(<span>$pagecount</span>)+1 : <span>intval</span>(<span>$pagecount</span>); <span>//</span><span>总页码,如果出现小数，那么就得+1页</span>
<span>119</span> <span>$start</span> = <span>$page</span>$page-1)*<span>$pagesize</span><span>;
</span><span>120</span>
<span>121</span> <span>$fileContent</span> = strsub(<span>$fileContent</span>, <span>$start</span>, <span>$pagesize</span>, 'utf8'<span>);
</span><span>122</span> ?>
<span>123</span>
<span>124</span> header>
<span>125</span> <style type="text/css">
<span>126 <span>p
<span>127 { margin: 10px; word-wrap: <span>break-word; border:<span>#<span>000 1px solid; padding:5px; }
<span>128 <span>p a
<span>129 { margin:<span> 5px; }
<span>130 </style>
<span>131</span> <span>header</span>>
<span>132</span>
<span>133</span> <p><?php <span>echo <span>$fileContent</span>; ?></p>
<span>134</span>
<span>135</span> <p>
<span>136</span> <span>php
</span><span>137</span> <span>echo</span> "共有字符：<span>$count</span> /每页 <span>$pagesize</span> 个 "<span>;
</span><span>138</span> <span>echo</span> " 共 <span>$pagecount</span> 页/当前第 <span>$page</span> 页"<span>;
</span><span>139</span>
<span>140</span> <span>if</span>(<span>$page</span> )
<span>141</span> <span>{
</span><span>142</span> <span>echo</span> '<a>首页</a>'<span>;
</span><span>143</span> <span>echo</span><span>;
</span><span>144</span> <span>}
</span><span>145</span> <span>else</span>
<span>146</span> <span>{
</span><span>147</span> <span>$up</span> = <span>$page</span>-1<span>;
</span><span>148</span> <span>echo</span> "<a href="/contentpage.php?p=1">首页</a>"<span>;
</span><span>149</span> <span>echo</span> "<a href="/contentpage.php?p=<span>%24up</span><span>;%0A</span><span>150</span>%20<span>%7D%0A</span><span>151</span>%20%0A<span>152</span>%20<span>if</span>(<span>%24page</span>%20==%20<span>%24pagecount</span><span>)%0A</span><span>153</span>%20<span>%7B%0A</span><span>154</span>%20%20%20%20%20<span>echo</span><span>;%0A</span><span>155</span>%20%20%20%20%20<span>echo</span>%20">尾页</a>'<span>;
</span><span>156</span> <span>}
</span><span>157</span> <span>else</span>
<span>158</span> <span>{
</span><span>159</span> <span>$down</span> = <span>$page</span>+1<span>;
</span><span>160</span> <span>echo</span> "<a href="/contentpage.php?p=<span>%24down</span><span>;%0A</span><span>161</span>%20%20%20%20%20<span>echo</span>%20%22<a%20href=">$pagecount'>尾页</a>"<span>;
</span><span>162</span> <span>}
</span><span>163</span> ?>
<span>164</span> </p>
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
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
1664
14
1423
52
1321
25
1269
29
1249
24
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
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.
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.
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.
PHP in Action: Real-World Examples and Applications
Apr 14, 2025 am 12:19 AM
PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.
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
The Enduring Relevance of PHP: Is It Still Alive?
Apr 14, 2025 am 12:12 AM
PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.
