php函数汇总(不断更新中...)

2011.06.13:

/*
获取客户端ip地址
*/
function clientip() {
    if (getenv('HTTP_CLIENT_IP')){
        $ip = getenv('HTTP_CLIENT_IP');
    }elseif(getenv('HTTP_X_FORWARDED_FOR')){
        $ip = getenv('HTTP_X_FORWARDED_FOR');
    }elseif(getenv('REMOTE_ADDR')){
        $ip = getenv('REMOTE_ADDR');
    }else{
        $ip = $_SERVER['REMOTE_ADDR'];
    }
    return $ip;
}

/*
取得随机字符串
参数：(int)$len 生成字符串长度，(int)mode 生成模式
*/
function random($len = 32,$mode = 0) {
    switch ($mode) {
        case '1':
            $str = '1234567890';
            break;
        case '2':
            $str = 'abcdefghijklmnopqrstuvwxyz';
            break;
        case '3':
            $str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
            break;
        case '4':
            $str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
            break;
        default:
            $str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890';
            break;
    }
    $result = '';
    $l = strlen($str) - 1;
    for($i = 0;$i < $len;$i ++){
        $num = rand(0, $l);
        $result .= $str[$num];
    }
    return $result;
}

/*
 创建文件夹
 参数：(str)$dirname 文件夹路径
 */
function createdir($dirname, $mode= 0777 ,$index = 1) {
    $res = true;
    if (is_null($dirname) || $dirname == "") {
        $res = false;
    }
    elseif (!is_dir($dirname)) {
        $res = mkdir($dirname, $mode);
        $index && @touch($dirname.'/index.html');
    }
    return $res;
}

/*
 创建多级目录文件夹
 参数：(str)$dirname 文件夹路径
 */
function createdirs($dirname, $mode= 0777 ,$index = 1) {
    $arr = explode('/', $dirname);
    $aimdir = '';
    foreach ($arr as $str) {
        $aimdir .= $str . '/';
        if (!file_exists($aimdir)) {
            mkdir($aimdir);
            $index && @touch($aimdir.'/index.html');
        }
    }
}

/*
 删除目录
 参数：(str)$dirname 文件夹路径
 */
function deletedirs($dirname) {
    if (file_exists($dirname) and is_dir($dirname)) {
        if (!$dirhandle = opendir($dirname))
            return false;
        while (($file = readdir($dirhandle)) !== false) {
            if ($file == "." or $file == "..") continue;
            $file = $dirname . DIRECTORY_SEPARATOR . $file;  //表示$file是$dir的子目录
            if (is_dir($file)) {
               deletedirs($file);
            } else {
                unlink($file);
            }
        }
        closedir($dirhandle);
        return rmdir($dirname);
    }
    else{
        return false;
    }
}

/*
 文件单位转换
 参数：(int)$size 文件大小Byte
 */
function getrealsize($size) {
    $res = '';
    $kb = 1024;
    $mb = $kb * 1024;
    $gb = $mb * 1024;
    $tb = $gb * 1024;
    if ($size < $kb) {
        $res = $size . "B";
    }
    elseif ($size >= $kb and $size < $mb){
        $res = round($size / $kb, 2) . "KB";
    }
    elseif ($size >= $mb and $size < $gb) {
        $res = round($size / $mb, 2) . "MB";
    }
    elseif ($size >= $gb and $size < $tb) {
        $res = round($size / $gb, 2) . "GB";
    }
    elseif ($size >= $tb) {
        $res = round($size / $tb, 2) . "TB";
    }
    return $res;
}