PHP upload file type judgment function (security)

php determines the upload type and avoids upload vulnerabilities

function ($file_name,$pass_type=array('jpg','jpeg','gif','bmp','png')){ 
$yx_file = $pass_type; 
$kzm = substr(strrchr($file_name,"."),1); 
$is_img = in_array(strtolower($kzm),$yx_file); 
if($is_img){ 
return true; 
}else{ 
return false; 
} 
}

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