A brief analysis of the PHP implementation of is_writable_PHP tutorial

The following functions can be used to replace PHP's built-in is_writable function

Copy code The code is as follows:

//Can be used to replace PHP's built-in is_writable function
function isWritable($filename){
if(preg_match('//$/',$filename)){
$tmp_file=sprintf('%s%s.tmp',$filename ,uniqid(mt_rand()));
                                                                                                                                          return isWritable($tmp_file);
$fp=@fopen($filename,'r+');
if($fp){
fclose($fp);
return true;
}
else{
                                                               ; fclose( $fp);
unlink($filename);
return true;
}
else{
return false;
}
}
}





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TechArticleThe following functions can be used to replace php’s built-in is_writable function. Copy the code. The code is as follows: //Can be used to replace php’s built-in is_writable Function function isWritable($filename){ if(preg_match('//...