get server ram with php

Question

Is there a way to know the avaliable ram in a server (linux distro) with php (widthout using linux commands)?

edit: sorry, the objective is to be aware of the ram av

Answer 1

It is worth noting that in Windows this information (and much more) can be acquired by executing and parsing the output of the shell command: systeminfo

Answer 2

// helpers

/**
 * @return array|null
 */
protected function getSystemMemInfo()
{
    $meminfo = @file_get_contents("/proc/meminfo");
    if ($meminfo) {
        $data = explode("\n", $meminfo);
        $meminfo = [];
        foreach ($data as $line) {
            if( strpos( $line, ':' ) !== false ) {
                list($key, $val) = explode(":", $line);
                $val = trim($val);
                $val = preg_replace('/ kB$/', '', $val);
                if (is_numeric($val)) {
                    $val = intval($val);
                }
                $meminfo[$key] = $val;
            }
        }
        return $meminfo;
    }
    return  null;
}

// example call to check health
public function check() {
    $memInfo = $this->getSystemMemInfo();
    if ($memInfo) {
        $totalMemory = $memInfo['MemTotal'];
        $freeMemory = $memInfo['MemFree'];
        $swapTotalMemory = $memInfo['SwapTotal'];
        $swapFreeMemory = $memInfo['SwapFree'];
        if (($totalMemory / 100.0) * 30.0 > $freeMemory) {
            if (($swapTotalMemory / 100.0) * 50.0 > $swapFreeMemory) {
                return new Failure('Less than 30% free memory and less than 50% free swap space');
            }
            return new Warning('Less than 30% free memory');
        }
    }
    return new Success('ok');
}

Answer 3

I don't think you can access the host server memory info without a special written PHP extension. The PHP core library does not allow (perhaps for security reasons) to access the extended memory info.

However, if your script has access to the /proc/meminfo then you can query that special file and grab the info you need. On Windows (although you've not asked for it) we can use the com_dotnet PHP extension to query the Windows framework via COM.

Below you can find my getSystemMemoryInfo that returns that info for you no matter if you run the script on a Linux/Windows server. The wmiWBemLocatorQuery is just a helper function.

function wmiWBemLocatorQuery( $query ) {
    if ( class_exists( '\\COM' ) ) {
        try {
            $WbemLocator = new \COM( "WbemScripting.SWbemLocator" );
            $WbemServices = $WbemLocator->ConnectServer( '127.0.0.1', 'root\CIMV2' );
            $WbemServices->Security_->ImpersonationLevel = 3;
            // use wbemtest tool to query all classes for namespace root\cimv2
            return $WbemServices->ExecQuery( $query );
        } catch ( \com_exception $e ) {
            echo $e->getMessage();
        }
    } elseif ( ! extension_loaded( 'com_dotnet' ) )
        trigger_error( 'It seems that the COM is not enabled in your php.ini', E_USER_WARNING );
    else {
        $err = error_get_last();
        trigger_error( $err['message'], E_USER_WARNING );
    }

    return false;
}

// _dir_in_allowed_path this is your function to detect if a file is withing the allowed path (see the open_basedir PHP directive)
function getSystemMemoryInfo( $output_key = '' ) {
    $keys = array( 'MemTotal', 'MemFree', 'MemAvailable', 'SwapTotal', 'SwapFree' );
    $result = array();

    try {
        // LINUX
        if ( ! isWin() ) {
            $proc_dir = '/proc/';
            $data = _dir_in_allowed_path( $proc_dir ) ? @file( $proc_dir . 'meminfo' ) : false;
            if ( is_array( $data ) )
                foreach ( $data as $d ) {
                    if ( 0 == strlen( trim( $d ) ) )
                        continue;
                    $d = preg_split( '/:/', $d );
                    $key = trim( $d[0] );
                    if ( ! in_array( $key, $keys ) )
                        continue;
                    $value = 1000 * floatval( trim( str_replace( ' kB', '', $d[1] ) ) );
                    $result[$key] = $value;
                }
        } else      // WINDOWS
        {
            $wmi_found = false;
            if ( $wmi_query = wmiWBemLocatorQuery( 
                "SELECT FreePhysicalMemory,FreeVirtualMemory,TotalSwapSpaceSize,TotalVirtualMemorySize,TotalVisibleMemorySize FROM Win32_OperatingSystem" ) ) {
                foreach ( $wmi_query as $r ) {
                    $result['MemFree'] = $r->FreePhysicalMemory * 1024;
                    $result['MemAvailable'] = $r->FreeVirtualMemory * 1024;
                    $result['SwapFree'] = $r->TotalSwapSpaceSize * 1024;
                    $result['SwapTotal'] = $r->TotalVirtualMemorySize * 1024;
                    $result['MemTotal'] = $r->TotalVisibleMemorySize * 1024;
                    $wmi_found = true;
                }
            }
            // TODO a backup implementation using the $_SERVER array
        }
    } catch ( Exception $e ) {
        echo $e->getMessage();
    }
    return empty( $output_key ) || ! isset( $result[$output_key] ) ? $result : $result[$output_key];
}

Example on a 8GB RAM system

print_r(getSystemMemoryInfo());

Output

Array
(
    [MemTotal] => 8102684000
    [MemFree] => 2894508000
    [MemAvailable] => 4569396000
    [SwapTotal] => 4194300000
    [SwapFree] => 4194300000
)

If you want to understand what each field represent then read more.