php - Increasing the number of iterations of a simple loop by 1 significantly increases execution time -


i need figure out situation webserver regarding execution time. i've noticed problem when server returns higher number of characters ~41000 - around 40kb.

so did script:

<?php     $php_start_time = microtime(true);     echo $_get['i'].':';     for($i=0;$i<=$_get['i'];$i++) { echo 'a'; }     echo '<br>runtime: '.(microtime(true) - $php_start_time); ?>

and try out, more 10 times each, multiple browsers:

when $_get['i']=40952 around 0.013...ms

when $_get['i']=40953 around 0.679...ms

a difference of 0.666 1 single char?

i saw runtime differs lot when trying page results different locations (online proxy).

so suppose has distances. i'm in eu, server in us.

until find way fix issue script available at: http://selfreveal.com/speed_test_1.php?i=40953

also phpinfo(): http://selfreveal.com/phpinfo.php

my first guess you're running memory limit , garbage collector kicking in. try increasing memory limit:

ini_set('memory_limit'. '128m');

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