How to use the PHP function memory_get_usage to obtain the amount of PHP memory clearing_PHP tutorial

1. Function prototype
int memory_get_usage ([ bool $real_usage = false ] )

2. Version compatible
PHP 4 >= 4.3. 2, PHP 5

3. Basic usage and examples
1. Get the current memory consumption

Copy code The code is as follows:

echo memory_get_usage();
$var = str_repeat("liuhui", 10000);
echo memory_get_usage();
unset($var);
echo memory_get_usage();
?>

Respectively output: 62328 122504 62416
Description: The value output by the memory_get_usage() function For bytes unit

2, format memory_get_usage() output

Copy the code The code is as follows:

< ;?php
function convert($size){
$unit=array('b','kb','mb','gb','tb','pb');
return @round($size/pow(1024,($i=floor(log($size,1024)))),2).' '.$unit[$i];
}
echo convert( memory_get_usage(true));
?>

Output: 256 kb

3, custom function to get the array or variable value size

Copy code The code is as follows:

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);
?>

Reference: http:// cn.php.net/manual/en/function.memory-get-usage.php

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