mem1.php

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<?php

function memory_get_process_usage()
{
    $status = file_get_contents('/proc/' . getmypid() . '/status');
    
    $matchArr = array();
    preg_match_all('~^(VmRSS|VmSwap):\s*([0-9]+).*$~im', $status, $matchArr);
    
    if(!isset($matchArr[2][0]) || !isset($matchArr[2][1]))
    {
        return false;
    }
    
    return intval($matchArr[2][0]) + intval($matchArr[2][1]);
}

echo memory_get_process_usage();

?>