memory_get_peak_usage

(PHP 5 >= 5.2.0, PHP 7, PHP 8)

memory_get_peak_usagePHP によって割り当てられたメモリの最大値を返す

説明

memory_get_peak_usage(bool $real_usage = false): int

PHP スクリプトに割り当てられたメモリの最大値を、バイト単位で返します。

パラメータ

real_usage

これを true に設定すると、システムが割り当てた実際のメモリの大きさを取得します。 省略したり false を設定したりすると、 emalloc() が使用するメモリのみを報告します。

戻り値

メモリの最大値をバイト数で返します。

参考

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User Contributed Notes 1 note

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stanislav dot eckert at vizson dot de
7 years ago
memory_get_peak_usage() is used to retrieve the highest memory usage of PHP (or your running script) only. If you need the overall memory usage of the entire system, following function might be helpful. If retrieves the memory usage either in percent (without the percent sign) or in bytes by returning an array with free and overall memory of your system. Tested with Windows (7) and Linux (on an Raspberry Pi 2):

<?php

// Returns used memory (either in percent (without percent sign) or free and overall in bytes)
function getServerMemoryUsage($getPercentage=true)
{
$memoryTotal = null;
$memoryFree = null;

if (
stristr(PHP_OS, "win")) {
// Get total physical memory (this is in bytes)
$cmd = "wmic ComputerSystem get TotalPhysicalMemory";
@
exec($cmd, $outputTotalPhysicalMemory);

// Get free physical memory (this is in kibibytes!)
$cmd = "wmic OS get FreePhysicalMemory";
@
exec($cmd, $outputFreePhysicalMemory);

if (
$outputTotalPhysicalMemory && $outputFreePhysicalMemory) {
// Find total value
foreach ($outputTotalPhysicalMemory as $line) {
if (
$line && preg_match("/^[0-9]+\$/", $line)) {
$memoryTotal = $line;
break;
}
}

// Find free value
foreach ($outputFreePhysicalMemory as $line) {
if (
$line && preg_match("/^[0-9]+\$/", $line)) {
$memoryFree = $line;
$memoryFree *= 1024; // convert from kibibytes to bytes
break;
}
}
}
}
else
{
if (
is_readable("/proc/meminfo"))
{
$stats = @file_get_contents("/proc/meminfo");

if (
$stats !== false) {
// Separate lines
$stats = str_replace(array("\r\n", "\n\r", "\r"), "\n", $stats);
$stats = explode("\n", $stats);

// Separate values and find correct lines for total and free mem
foreach ($stats as $statLine) {
$statLineData = explode(":", trim($statLine));

//
// Extract size (TODO: It seems that (at least) the two values for total and free memory have the unit "kB" always. Is this correct?
//

// Total memory
if (count($statLineData) == 2 && trim($statLineData[0]) == "MemTotal") {
$memoryTotal = trim($statLineData[1]);
$memoryTotal = explode(" ", $memoryTotal);
$memoryTotal = $memoryTotal[0];
$memoryTotal *= 1024; // convert from kibibytes to bytes
}

// Free memory
if (count($statLineData) == 2 && trim($statLineData[0]) == "MemFree") {
$memoryFree = trim($statLineData[1]);
$memoryFree = explode(" ", $memoryFree);
$memoryFree = $memoryFree[0];
$memoryFree *= 1024; // convert from kibibytes to bytes
}
}
}
}
}

if (
is_null($memoryTotal) || is_null($memoryFree)) {
return
null;
} else {
if (
$getPercentage) {
return (
100 - ($memoryFree * 100 / $memoryTotal));
} else {
return array(
"total" => $memoryTotal,
"free" => $memoryFree,
);
}
}
}

function
getNiceFileSize($bytes, $binaryPrefix=true) {
if (
$binaryPrefix) {
$unit=array('B','KiB','MiB','GiB','TiB','PiB');
if (
$bytes==0) return '0 ' . $unit[0];
return @
round($bytes/pow(1024,($i=floor(log($bytes,1024)))),2) .' '. (isset($unit[$i]) ? $unit[$i] : 'B');
} else {
$unit=array('B','KB','MB','GB','TB','PB');
if (
$bytes==0) return '0 ' . $unit[0];
return @
round($bytes/pow(1000,($i=floor(log($bytes,1000)))),2) .' '. (isset($unit[$i]) ? $unit[$i] : 'B');
}
}

// Memory usage: 4.55 GiB / 23.91 GiB (19.013557664178%)
$memUsage = getServerMemoryUsage(false);
echo
sprintf("Memory usage: %s / %s (%s%%)",
getNiceFileSize($memUsage["total"] - $memUsage["free"]),
getNiceFileSize($memUsage["total"]),
getServerMemoryUsage(true)
);

?>

The function getNiceFileSize() is not required. Just used to shorten size in bytes.

Note: If you need the server load (CPU usage), I wrote a nice function to get that too: http://php.net/manual/en/function.sys-getloadavg.php#118673
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