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Gratulacje i dzięki! Trafiłem tu przypadkiem poszukując informacji na temat php+mysql. Wiele polskich stron powiela identyczne przykłady, klonuje te same kursy i lekcje... ten serwis okazał sie inny. Zasada "problem - rozwiazanie - wyjaśnienie" zdaje egzamin - zapewnia jasną, jednoznaczną i pewną pomoc w konkretnym przypadku. Porady są warte swojej ceny, przede wszystkim ze względu na przyjazną (także dla początkujących) formę i treść oraz bogate i stale powiększane zasoby. Polecam i pozdrawiam!
Kamil Dmowski
Polski Czerwony Krzyż
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memory_get_usage (PHP 4 >= 4.3.2, PHP 5) memory_get_usage -- Returns the amount of memory allocated to PHP Descriptionint memory_get_usage ( void )
Returns the amount of memory, in bytes, that's currently being
allocated to your PHP script.
memory_get_usage() will only be defined if your PHP
is compiled with the --enable-memory-limit
configuration option.
Przykład 1. A memory_get_usage() example |
<?php
echo memory_get_usage() . "\n"; $a = str_repeat("Hello", 4242);
echo memory_get_usage() . "\n"; unset($a);
echo memory_get_usage() . "\n"; ?>
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See also
memory_limit.
User Contributed Notesgrey - greywyvern - com
17-Aug-2005 09:37
If nothing else in the user notes below works for you, you can get a very (VERY) rough estimate of PHP memory usage by outputting the $GLOBALS array, stripping it of indentation whitespace, and counting the characters in the resulting string. This method has a very high overhead (to be expected), but works on all operating systems, regardless of whether or not they have the --enable-memory-limit config option set. I find that the syntax overhead of the print_r() statement roughly accounts for the PHP runtime base memory usage.
The code below is set up to work on all arrays, not just the $GLOBALS array. Keep in mind that outside data referenced by resource IDs, such as database results and open file data, is not included in this total.
<?php
function array_size($arr) {
ob_start();
print_r($arr);
$mem = ob_get_contents();
ob_end_clean();
$mem = preg_replace("/\n +/", "", $mem);
$mem = strlen($mem);
return $mem;
}
$memEstimate = array_size($GLOBALS);
?>
Use only if being off to either side by at least 20% is acceptible for your purposes.
vesa dot kivisto at nepton dot fi
14-Jul-2005 03:02
I was unable to get the previous examples working properly and created code which works at least for me. Enjoy!
// Please note that you'll need the pslist.exe utility from http://www.sysinternals.com/Utilities/PsTools.html
// This is because win/2000 itself does not provide a task list utility.
//
function getMemoryUsage() {
// try to use PHP build in function
if( function_exists('memory_get_usage') ) {
return memory_get_usage();
}
// Try to get Windows memory usage via pslist command
if ( substr(PHP_OS,0,3) == 'WIN') {
$resultRow = 8;
$resultRowItemStartPosition = 34;
$resultRowItemLength = 8;
$output = array();
exec('pslist -m ' . getmypid() , $output);
return trim(substr($output[$resultRow], $resultRowItemStartPosition, $resultRowItemLength)) . ' KB';
}
// No memory functionality available at all
return '<b style="color: red;">no value</b>';
}
guenter_doege at web dot de
11-Jul-2005 08:28
The Win XP / 2003 workaround script will also work with windows 2000 with a few slight modifications.
Please note that you'll need the pslist.exe utility from http://www.sysinternals.com/Utilities/PsTools.html because win/2000 itself does not provide a task list utility.
<?php
function getMemUsage()
{
if (function_exists('memory_get_usage'))
{
return memory_get_usage();
}
else if ( substr(PHP_OS,0,3) == 'WIN')
{
$output = array();
exec('pslist ' . getmypid() , $output);
return trim(substr($output[8],38,10));
}
else
{
return '<b style="color: red;">no value</b>';
}
}
?>
MagicalTux at FF dot st
25-May-2005 09:08
When you need to get the OS, do not use $_SERVER['OS'] or $_ENV['OS'], better use PHP_OS constant !
<?php
if (substr(PHP_OS,0,3)=='WIN') {
}
?>
You also have other values such as CYGWIN_NT-5.0, Linux, ... this is the best way to get system's os (anyone on linux can do an "export OS=windows")
markus at computino dot de
09-Jan-2005 11:38
on PHP Version 5.0.2 (with WinXP pro, Apache 2) it's not
<?php $_SERVER["OS"] ?> but
<?php $_ENV["OS"] ?>
webNOSPAMsjwans at hotmail dot com
01-Dec-2004 04:09
A quick and dirty Windows XP / 2003 wordaround:
<?php
function getMemUsage()
{
if (function_exists('memory_get_usage'))
{
return memory_get_usage();
}
else if ( strpos( strtolower($_SERVER["OS"]), 'windows') !== false)
{
$output = array();
exec('tasklist /FI "PID eq ' . getmypid() . '" /FO LIST', $output);
return substr($output[5], strpos($output[5], ':') + 1);
}
else
{
return '<b style="color: red;">no value</b>';
}
}
?>
randolphothegreat at yahoo dot com
29-Nov-2004 10:37
I'd just like to point out that although sandeepc at myrealbox dot com's idea for displaying the current memory usage is a good one, it's perhaps a bad idea to pipe the entire process list through grep. A better performing method would be to select only the process we're interested in:
<?
$pid = getmypid();
error_log('MEMORY USAGE (% KB PID ): ' . `ps --pid $pid --no-headers -o%mem,rss,pid`);
?>
True, it's not much of a performance boost, but every bit helps.
ad-rotator.com
14-May-2004 07:31
The method sandeepc at myrealbox dot com posted yields larger memory usage, my guess is that it includes all the PHP interpreter/internal code and not just the script being run.
1) Use ps command
MEMORY USAGE (% KB PID ): 0.8 12588 25087 -> about 12MB
2) Use memory_get_usage()
int(6041952) -> about 6MB
sandeepc at myrealbox dot com
11-Nov-2003 06:15
To get this in pre 4.2.3 do a (works on unix like systems only):
$my_pid = getmypid();
error_log("MEMORY USAGE (% KB PID ): ".`ps -eo%mem,rss,pid | grep $my_pid`);
found this tip somewhere in bugs.php.net!
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