WordPress显示内存占用和负载

把下面代码复制到当前主题的 functions.php 中。

总物理内存：

function memTotal() {
    $str = @file("/proc/meminfo");
    $str = implode("", $str);
    preg_match_all("/MemTotal\s{0,}\:+\s{0,}([\d\.]+).+?MemFree\s{0,}\:+\s{0,}([\d\.]+).+?Cached\s{0,}\:+\s{0,}([\d\.]+).+?SwapTotal\s{0,}\:+\s{0,}([\d\.]+).+?SwapFree\s{0,}\:+\s{0,}([\d\.]+)/s", $str, $buf);
    preg_match_all("/Buffers\s{0,}\:+\s{0,}([\d\.]+)/s", $str, $buffers);
    $memTotal = round($buf[1][0]/1024, 2);
    return $memTotal;
}

内存使用：

function memUsed() {
    $str = @file("/proc/meminfo");
    $str = implode("", $str);
    preg_match_all("/MemTotal\s{0,}\:+\s{0,}([\d\.]+).+?MemFree\s{0,}\:+\s{0,}([\d\.]+).+?Cached\s{0,}\:+\s{0,}([\d\.]+).+?SwapTotal\s{0,}\:+\s{0,}([\d\.]+).+?SwapFree\s{0,}\:+\s{0,}([\d\.]+)/s", $str, $buf);
    preg_match_all("/Buffers\s{0,}\:+\s{0,}([\d\.]+)/s", $str, $buffers);
    $memTotal = round($buf[1][0]/1024, 2);
    $memFree = round($buf[2][0]/1024, 2);
    $memUsed = $memTotal-$memFree;
    return $memUsed;
}

真实内存使用：

function memRealUsed() {
    $str = @file("/proc/meminfo");
    $str = implode("", $str);
    preg_match_all("/MemTotal\s{0,}\:+\s{0,}([\d\.]+).+?MemFree\s{0,}\:+\s{0,}([\d\.]+).+?Cached\s{0,}\:+\s{0,}([\d\.]+).+?SwapTotal\s{0,}\:+\s{0,}([\d\.]+).+?SwapFree\s{0,}\:+\s{0,}([\d\.]+)/s", $str, $buf);
    preg_match_all("/Buffers\s{0,}\:+\s{0,}([\d\.]+)/s", $str, $buffers);
    $memTotal = round($buf[1][0]/1024, 2);
    $memFree = round($buf[2][0]/1024, 2);
  $memCached = round($buf[3][0]/1024, 2);
  $memBuffers = round($buffers[1][0]/1024, 2);
    $memRealUsed = $memTotal-$memFree-$memCached-$memBuffers;
    return $memRealUsed;
  
}

系统负载：

function loadAvg() {
    $str = @file("/proc/loadavg");
    $str = explode(" ", implode("", $str));
    $str = array_chunk($str, 4);
    $loadAvg = implode(" ", $str[0]);
    return $loadAvg;
}

函数引用方式示例：

echo memTotal(); // 总共物理内存