php - Logging client run times to server log file using AJAX -

so have log client-side script run times server side log file. measure time function takes, , report server via ajax. code correct? don't have access production server right now, xampp malfunctioning, , don't want show boss until i'm sure it'll work. first time using ajax, , second time using js.

in index.php:

function search(x,acc)     {            var starttime = new date().gettime();            //do work            //            var endtime = new date().gettime() - starttime;            var outputmessage = "the process took: " + max/1000 + "seconds";            console.log(outputmessage);            $.ajax({            type: "post",            url: "ajaxcallback.php",            data: {outputmessage},            success: function()                     {                         console.log("client side : ajax post     submitted.");                     }             }     } 

then ajaxcallback.php:

<?php     $stringdata = $_post['outputmessage'];      echo $stringdata;     $myfile = "logfile.log";     $fh = fopen($myfile, 'a') or die("can't open file");     fwrite($fh, $stringdata);     fclose($fh); ?> 

your data param in ajax call needs use key/value pair:

data: {outputmessage:outputmessage} 

in outputmessage, variable max not defined.

also proper error handling should considered when using fopen:

if($fh = fopen($myfile, 'a')){     fwrite($fh, $stringdata);     fclose($fh);     }else{     die("can't open file"); } 

everything else looks pretty straight forward.