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HomeBackend DevelopmentPHP ProblemHow to remove img tag in php

php去掉img标签的方法是:可以通过【preg_replace()】函数来实现,函数语法【preg_replace ( mixed $pattern , mixed $replacement , mixed $subject)】。

How to remove img tag in php

函数介绍:

preg_replace 函数执行一个正则表达式的搜索和替换。

函数语法:

mixed preg_replace ( mixed $pattern , mixed $replacement , mixed $subject [, int $limit = -1 [, int &$count ]] )

搜索 subject 中匹配 pattern 的部分, 以 replacement 进行替换。

参数介绍:

  • $pattern: 要搜索的模式,可以是字符串或一个字符串数组。

  • $replacement: 用于替换的字符串或字符串数组。

  • $subject: 要搜索替换的目标字符串或字符串数组。

  • $limit: 可选,对于每个模式用于每个 subject 字符串的最大可替换次数。 默认是-1(无限制)。

  • $count: 可选,为替换执行的次数。

返回值:

如果 subject 是一个数组, preg_replace() 返回一个数组, 其他情况下返回一个字符串。

如果匹配被查找到,替换后的 subject 被返回,其他情况下 返回没有改变的 subject。如果发生错误,返回 NULL。

代码实现:

$str='
欢迎访问php中文网
';
$str= preg_replace(&#39;/<\s*img\s+[^>]*?src\s*=\s*(\&#39;|\")(.*?)\\1[^>]*?\/?\s*>/i&#39;, &#39;&#39;, $str);
echo $str;

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