How to replace a tag with php regular expression

How to regularly replace a tags in php: first put all a tags in the web page into an array; then use the regular expression "preg_match_all($reg1,$str,$aarray);" to take out the a tags links and content.

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php Regularly matches the content in the a tag level a tag

<?php
header("Content-type: text/html; charset=utf-8");
$str=file_get_contents("https://www.cn-teacher.com/kf/");
//拿出网页中所有《a》标签放到数组
$reg1="/<a .*?>.*?<\/a>/";
$aarray;//这个存放的就是正则匹配出来的所有《a》标签数组
preg_match_all($reg1,$str,$aarray);
//拿出《a》标签中的链接和标签内容
$hrefarray;//这个存放的是匹配出来的href的链接地址
$acontent;//存放匹配出来的a标签的内容
$reg2="/href=\"([^\"]+)/";
for($i=0;$i<count($aarray[0]);$i++){
preg_match_all($reg2,$aarray[0][$i],$hrefarray);
echo $hrefarray[1][0]."\r\n";//这里输出的就是遍历出来的所有a标签的链接
//拿出《a》标签的内容
$reg3="/>(.*)<\/a>/";
preg_match_all($reg3,$aarray[0][$i],$acontent);
echo $acontent[1][0]."\r\n";//这里输出的就是a标签的文字了
}
?>

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