Memory and time consumed by php test code execution_PHP tutorial

To test the memory and time consumed by code execution in PHP, we can directly use two functions, microtime and memory_get_usage. Let me introduce them to you below.

Let’s take a look at the usage of microtime and memory_get_usage functions first

Yihe Usage

microtime() The function returns the current Unix timestamp and microseconds.

Grammar

microtime(get_as_float) parameter description
get_as_float If the get_as_float parameter is given and its value is equivalent to TRUE, this function returns a floating point number.

Example

The code is as follows	Copy code
代码如下	复制代码
echo(microtime()); ?>

echo(microtime());

?>

Output:

0.25139300 1138197510

1. Function prototype

int memory_get_usage ([ bool $real_usage=false ] )

Two, version compatible

PHP 4 >= 4.3.2,PHP 5

3. Basic usage and examples

1, get the current memory consumption

代码如下	复制代码
echo memory_get_usage(); $var=str_repeat(www.bKjia.c0m,10000); echo memory_get_usage(); unset($var); echo memory_get_usage(); ?>

The code is as follows	Copy code
echo memory_get_usage(); $var=str_repeat(www.bKjia.c0m,10000); echo memory_get_usage(); unset($var); echo memory_get_usage(); ?>

代码如下	复制代码
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)); ?>

Result output: 62328 122504 62416 Note: The value output by the memory_get_usage() function is in bytes unit 2, format the memory_get_usage() result and output it in KB units

The code is as follows	Copy code
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)); ?>

265KB

Now that the two functions have been basically introduced, let me look at a test example

The code is as follows

代码如下

复制代码

$t1 = microtime(true); $m1 = memory_get_usage(true); echo fixByte($m1). ' '; /*↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓*/ /*↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑*/ $t2 = microtime(true); $m2 = memory_get_usage(true); echo ' ' . fixByte($m2). ' '; echo ' '; echo 'time ' . round(($t2 - $t1), 4) .' '; echo 'mem ' . fixByte($m2 - $m1) .  ' '; /**  * 格式化字节为合适的数值  * @param int $byte 字节数  * @param string $string 格式化的可读性强的字节数  */ function fixByte($byte, $string = true, $dot_num = 9) {  $ret = array(    'data'=>$byte,    'danwei'=>'Byte',  );  if ($byte  } else if ($byte   $ret['data'] = round($byte / 1024, $dot_num);   $ret['danwei']='K';  } else if ($byte   $ret['data'] = round($byte / (1024*1024), $dot_num);   $ret['danwei']='M';  } else if ($byte   $ret['data'] = round($byte / (1024*1024*1024), $dot_num);   $ret['danwei']='GB';  } else if ($byte   $ret['data'] = round($byte / (1024*1024*1024*1024), $dot_num);   $ret['danwei']='TB';  }  if ($string) {   $ret = $ret['data'] . ' ' . $ret['danwei'];  }  return $ret; }

Copy code

$t1 = microtime(true);
$m1 = memory_get_usage(true);
echo fixByte($m1). '
';

/*↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓*/ /*↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑*/ $t2 = microtime(true);
$m2 = memory_get_usage(true);
echo '
' . fixByte($m2). '
'; echo '

---

';
echo 'time ' . round(($t2 - $t1), 4) .'
';
echo 'mem ' . fixByte($m2 - $m1) . '
'; /**
* Format bytes to appropriate values
* @param int $byte number of bytes
* @param string $string formatted number of bytes that are highly readable
​*/
function fixByte($byte, $string = true, $dot_num = 9) {
$ret = array(
'data'=>$byte,
'danwei'=>'Byte',
); if ($byte

} else if ($byte $ret['data'] = round($byte / 1024, $dot_num);
$ret['danwei']='K';
} else if ($byte $ret['data'] = round($byte / (1024*1024), $dot_num);
$ret['danwei']='M';
} else if ($byte $ret['data'] = round($byte / (1024*1024*1024), $dot_num);
$ret['danwei']='GB';
} else if ($byte $ret['data'] = round($byte / (1024*1024*1024*1024), $dot_num);
$ret['danwei']='TB';
} if ($string) {
$ret = $ret['data'] . ' ' . $ret['danwei'];
}

return $ret;
} http://www.bkjia.com/PHPjc/631551.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/631551.htmlTechArticleTo test the memory and time consumed by code execution in php, we can directly use two functions, microtime and memory_get_usage. Okay, let me introduce it to you. Let’s go first...