php在上传表单中检查文件扩展名 [英] php check file extension in upload form

问题描述

我检查文件扩展名是否上传。我的方法工作，但现在我需要明白，我的方法（pathinfo）是真实的？另一种更好更快的方式？谢谢

  $ filename = $ _FILES ['video_file'] ['name']; 
 $ ext = pathinfo（$ filename，PATHINFO_EXTENSION）; 
 if（$ ext！=='gif'|| $ ext！=='png'|| $ ext！=='jpg'）{echo'error';} 
  if（$ ext！=='gif'）  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 $ b $ p>  $ allowed = array（'gif'，'png'，'jpg'）; 
 $ filename = $ _FILES ['video_file'] ['name']; 
 $ ext = pathinfo（$ filename，PATHINFO_EXTENSION）; 
 if（！in_array（$ ext，$ allowed））{
 echo'error'; 
} 
  




I check file extension for upload or not uploaded. my i.e methods worked but now i need to understand, my methods (pathinfo) is true ? another better and faster way ?! Thanks

$filename = $_FILES['video_file']['name'];
$ext = pathinfo($filename, PATHINFO_EXTENSION);
if( $ext !== 'gif' || $ext !== 'png' || $ext !== 'jpg' ) {echo 'error';}

解决方案

Using if( $ext !== 'gif') might not be efficient what if you allow like 20 different extensions

Try

$allowed =  array('gif','png' ,'jpg');
$filename = $_FILES['video_file']['name'];
$ext = pathinfo($filename, PATHINFO_EXTENSION);
if(!in_array($ext,$allowed) ) {
    echo 'error';
}

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