International PHP Conference Berlin 2025

memory_get_peak_usage

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

memory_get_peak_usageRetourne la quantité de mémoire maximale allouée par PHP

Description

memory_get_peak_usage(bool $real_usage = false): int

Retourne la quantité de mémoire maximale, en octets, qui a été allouée à votre script PHP.

Liste de paramètres

real_usage

Définir à true pour récupérer la taille réelle de la mémoire allouée par le système. Si ce paramètre n'est pas défini ou vaut false, seule la mémoire utilisée par emalloc() sera retournée.

Valeurs de retour

Retourne la quantité de mémoire, en octets.

Voir aussi

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User Contributed Notes 1 note

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33
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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