php正则提取html图片(img)src地址与任意属性的方法

简单版：

<?php header("Content-Type: text/html;charset=utf-8"); $str = '<div class="ui-block-a" align="center"> <a href="online-39.html" rel="external nofollow" ><img class="lazy" width="131" height="177" src="http://www.haoshilao.net/  file_images/game/201702/2017020716154162.jpg"/> <h3>2014年</h3></a> </div>'; $imgpreg = "/<img (.*?) src=\"(.+?)\".*?>/"; preg_match($imgpreg,$str,$img); $mycount=count($img)-1; $imgval = $iim[$mycount]; if(!empty($imgval)){ echo $imgval; }else{ echo 'no'; } ?>

详细版：

<?php /*PHP正则提取图片img标记中的任意属性*/ $str = '<center><img src="/uploads/images/2017020716154162.jpg" height="120" width="120"><br />PHP正则提取或更改图片img标记中的任意属性</center>'; //1、取整个图片代码 preg_match('/<\s*img\s+[^>]*?src\s*=\s*(\'|\")(.*?)\\1[^>]*?\/?\s*>/i',$str,$match); echo $match[0]; //2、取width preg_match('/<img.+(width=\"?\d*\"?).+>/i',$str,$match); echo $match[1]; //3、取height preg_match('/<img.+(height=\"?\d*\"?).+>/i',$str,$match); echo $match[1]; //4、取src preg_match('/<img.+src=\"?(.+\.(jpg|jpg|jpg|bnp|jpg))\"?.+>/i',$str,$match); echo $match[1]; /*PHP正则替换图片img标记中的任意属性*/ //1、将src="/uploads/images/20100516000.jpg"替换为src="/uploads/uc/images/2017020716154162.jpg") print preg_replace('/(<img.+src=\"?.+)(images\/)(.+\.(jpg|jpg|jpg|bnp|jpg)\"?.+>)/i',"\${1}uc/images/\${3}",$str); echo "<hr/>"; //2、将src="/uploads/images/20100516000.jpg"替换为src="/uploads/uc/images/2017020716154162.jpg",并省去宽和高 print preg_replace('/(<img).+(src=\"?.+)images\/(.+\.(jpg|jpg|jpg|bnp|jpg)\"?).+>/i',"\${1} \${2}uc/images/\${3}>",$str); ?>

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