Get PHP memory consumption memory_get_usage function usage-PHP source code

This article introduces how to use the memory_get_usage () function in php to obtain the current memory consumption and optimize the program performance. This article introduces how to use the memory_get_usage () function in php to obtain the current memory consumption and optimize the program performance.

Script ec (2); script

I. function prototype
Int memory_get_usage ([bool $ real_usage = false])

2. Version compatibility
PHP 4> = 4.3.2, PHP 5

III. Basic usage and Examples
1. Get the current memory consumption

The Code is as follows:
Echo memory_get_usage (); $ Var = str_repeat ("liuhui", 10000 ); Echo memory_get_usage (); Unset ($ var ); Echo memory_get_usage (); ?>

Output: 62328 122504 62416
Note: The value output by the memory_get_usage () function is bytes.

2. format the memory_get_usage () output.

The Code is as follows:
Function convert ($ size ){ $ Unit = array ('B', 'kb', 'mb', 'gb', 'tb', 'petab '); Return @ round ($ size/pow (1024, ($ I = floor (log ($ size, 1024), 2 ). ''. $ unit [$ I]; } Echo convert (memory_get_usage (true )); ?>

Output: 256 kb

3. the user-defined function obtains the array or variable value size.

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 ); ?>