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PHP simple string filtering method example sharing

墨辰丷

Jun 01, 2018 pm 02:08 PM

php string Example

这篇文章主要介绍了PHP简单字符串过滤方法,结合实例形式分析了php通过对字符串中特殊字符进行正则替换实现字符过滤功能的简单操作技巧,需要的朋友可以参考下

具体如下：

<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1,maximum-scale=1, user-scalable=no">
<title>PHP字符串的过滤方法</title>
</head>
<body>
<?php
function strFilter($str){
  //特殊字符的过滤方法
  $str = str_replace(&#39;`&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;·&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;~&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;!&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;！&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;@&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;#&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;$&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;￥&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;%&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;^&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;……&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;&&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;*&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;(&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;)&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;（&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;）&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;-&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;_&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;——&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;+&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;=&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;|&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;\\&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;[&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;]&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;【&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;】&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;{&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;}&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;;&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;；&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;:&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;：&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;\&#39;&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;"&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;“&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;”&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;,&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;，&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;<&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;>&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;《&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;》&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;.&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;。&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;/&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;、&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;?&#39;, &#39;&#39;, $str);
  $str = str_replace(&#39;？&#39;, &#39;&#39;, $str);
  //防sql防注入代码的过滤方法
  $str = str_replace(&#39;and&#39;,&#39;&#39;,$str);
  $str = str_replace(&#39;execute&#39;,&#39;&#39;,$str);
  $str = str_replace(&#39;update&#39;,&#39;&#39;,$str);
  $str = str_replace(&#39;count&#39;,&#39;&#39;,$str);
  $str = str_replace(&#39;chr&#39;,&#39;&#39;,$str);
  $str = str_replace(&#39;mid&#39;,&#39;&#39;,$str);
  $str = str_replace(&#39;master&#39;,&#39;&#39;,$str);
  $str = str_replace(&#39;truncate&#39;,&#39;&#39;,$str);
  $str = str_replace(&#39;char&#39;,&#39;&#39;,$str);
  $str = str_replace(&#39;declare&#39;,&#39;&#39;,$str);
  $str = str_replace(&#39;select&#39;,&#39;&#39;,$str);
  $str = str_replace(&#39;create&#39;,&#39;&#39;,$str);
  $str = str_replace(&#39;delete&#39;,&#39;&#39;,$str);
  $str = str_replace(&#39;insert&#39;,&#39;&#39;,$str);
  $str = str_replace(&#39;or&#39;,&#39;&#39;,$str);
  return trim($str);
}
$cont = &#39;  ?”？;onestopweb.cn and update //\ as chaoyi 》、  &#39;;
echo &#39;开始[&#39;.strFilter($cont).&#39;]结束&#39;;
?>
</body>
</html>

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效果图如下：

总结：以上就是本篇文的全部内容，希望能对大家的学习有所帮助。

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