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How to replace img tag in php

王林
Release: 2023-03-04 14:22:02
Original
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php替换img标签的方法:可以利用正则表达式来实现。php为我们提供了preg_match()函数,该函数可用于执行一个正则表达式匹配,返回匹配次数,并在第一次匹配后停止搜索。

How to replace img tag in php

php为我们提供了preg_match 函数,该函数可用于执行一个正则表达式匹配。

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语法格式为:

int preg_match(string $pattern, string $subject[, array &$matches[, int $flags = 0[, int $offset = 0]]])
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返回值:

返回 pattern 的匹配次数。 它的值将是 0 次(不匹配)或 1 次,因为 preg_match() 在第一次匹配后 将会停止搜索。

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代码示例:

<?php
/*PHP正则提取图片img标记中的任意属性*/
$str = &#39;<center><img src="/uploads/images/20100516000.jpg" height="120" width="120"><br />PHP正则提取或更改图片img标记中的任意属性</center>&#39;;
//1、取整个图片代码
preg_match(&#39;/<\s*img\s+[^>]*?src\s*=\s*(\&#39;|\")(.*?)\\1[^>]*?\/?\s*>/i&#39;,$str,$match);
echo $match[0];
//2、取width
preg_match(&#39;/<img.+(width=\"?\d*\"?).+>/i&#39;,$str,$match);
echo $match[1];
//3、取height
preg_match(&#39;/<img.+(height=\"?\d*\"?).+>/i&#39;,$str,$match);
echo $match[1];
//4、取src
preg_match(&#39;/<img.+src=\"?(.+\.(jpg|gif|bmp|bnp|png))\"?.+>/i&#39;,$str,$match);
echo $match[1];
/*PHP正则替换图片img标记中的任意属性*/
//1、将src="/uploads/images/20100516000.jpg"替换为src="/uploads/uc/images/20100516000.jpg")
print preg_replace(&#39;/(<img.+src=\"?.+)(images\/)(.+\.(jpg|gif|bmp|bnp|png)\"?.+>)/i&#39;,"\${1}uc/images/\${3}",$str);
echo "<hr/>";
//2、将src="/uploads/images/20100516000.jpg"替换为src="/uploads/uc/images/20100516000.jpg",并省去宽和高
print preg_replace(&#39;/(<img).+(src=\"?.+)images\/(.+\.(jpg|gif|bmp|bnp|png)\"?).+>/i&#39;,"\${1} \${2}uc/images/\${3}>",$str);
?>
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