How to replace img attribute in php regular

php正则替换img属性的方法：1、通过正则表达式取整个img图片代码；2、通过“preg_replace('/(

本文操作环境：windows7系统、PHP7.1版，DELL G3电脑

php正则怎么替换img 属性？

PHP正则提取或替换img标记属性

代码如下：

<?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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