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While profiling code it's possible to need information about memory usage. You can use directly memory_get_usage() if PHP was compiled with the --enable-memory-limit. Otherwise this is a better way to get it.
Notice that you can't get memory usage if PHP is running in safe_mode.
| <?php
/**
* Get Memory usage of current process
*
* @return string
*/
function GetMemoryUsage()
{
if (function_exists('memory_get_usage'))
{
return memory_get_usage();
} else {
$safe_mode = (bool)ini_get("safe_mode");
if ($safe_mode) {
return "Error : you can't get Memory usage in safe_mode.";
}
$output = array();
if ( substr(PHP_OS, 0, 3) == "WIN")
{
exec('tasklist /FI "PID eq ' . getmypid() . '" /FO LIST', &$output);
return substr($output[5], strpos($output[5], ':') + 1);
} else {
exec('ps -eo%mem,rss,pid | grep '.getmypid(), &$output);
return $output;
}
}
}
?> | |
Usage Examples
| echo GetMemoryUsage() . "\n"; // 6,776 K
$a = str_repeat("Hello", 42);
echo GetMemoryUsage() . "\n"; // 6,764
unset($a);
echo GetMemoryUsage() . "\n"; // 6,764
?> | |
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| Find the peak memory usage (PHP5+)
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