PHP method to delete pictures when modifying news, _PHP tutorial

php implements the method of deleting pictures when modifying news,

This article describes the example of php implementing the method of deleting pictures when modifying news. Share it with everyone for your reference. The specific implementation method is as follows:

//old_contents：待修改的公告内容;
//$content：修改后的公告内容
$oldPic=array();
$nowPic=array();
preg_match_all("/\<IMG(.*&#63;)src=\"(.*&#63;)\">/",$old_contents,$match);
if(!empty($match[2])){
 foreach($match[2] as $key=>$value){
 array_push($oldPic,basename($value));
 }
}
preg_match_all("/\<IMG(.*&#63;)src=\"(.*&#63;)\">/",$content,$testpic);
if(!empty($testpic[2])){
 foreach($testpic[2] as $key=>$value){
 array_push($nowPic,basename($value));
 }
}
$intersectPic=array_intersect($nowPic,$oldPic);//计算交集
foreach($oldPic as $key=>$value){
 if(!in_array($value,$intersectPic)){
 $delPic="图片路径".$value
  unlink($delPic);
 }
}

I hope this article will be helpful to everyone’s PHP programming design.

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