Error Log in php

You can make a new Log file, different original linux error file. 

If not can look Ajax or hidden procedures. Better than mail send in yourself.

<?php 

error_log(date("Y.m.d H:i:s")."- path/filename - error in ... ".$error."  anything messages: " . mysql_error()."az sql: ".$sql."\n", 3, "tmp/php.log");

?>