function nodeTree($arr, $id = 0, $level = 0) {
    static $array = array();
    foreach ($arr as $v) {
        if ($v['pid'] == $id) {
            $v['level'] = $level;
            $array[] = $v;
            nodeTree($arr, $v['id'], $level + 1);
        }
    }
    return $array;
}

/**
 * 下拉选择框
 */
function select($array = array(), $id = 0, $str = '', $default_option = '') {
    $string = '<select ' . $str . '>';
    $default_selected = (empty($id) && $default_option) ? 'selected' : '';
    if ($default_option)
        $string .= "<option value='' $default_selected>$default_option</option>";
    if (!is_array($array) || count($array) == 0)
        return false;
    $ids = array();
    if (isset($id))
        $ids = explode(',', $id);
    foreach ($array as $key => $value) {
        $selected = in_array($key, $ids) ? 'selected' : '';
        $string .= '<option value="' . $key . '" ' . $selected . '>' . $value . '</option>';
    }
    $string .= '</select>';
    return $string;
}

/**
 * 复选框
 * 
 * @param $array 选项 二维数组
 * @param $id 默认选中值，多个用 '逗号'分割
 * @param $str 属性
 * @param $defaultvalue 是否增加默认值 默认值为 -99
 * @param $width 宽度
 */
function checkbox($array = array(), $id = '', $str = '', $defaultvalue = '', $width = 0, $field = '') {
    $string = '';
    $id = trim($id);
    if ($id != '')
        $id = strpos($id, ',') ? explode(',', $id) : array($id);
    if ($defaultvalue)
        $string .= '<input type="hidden" ' . $str . ' value="-99">';
    $i = 1;
    foreach ($array as $key => $value) {
        $key = trim($key);
        $checked = ($id && in_array($key, $id)) ? 'checked' : '';
        if ($width)
            $string .= '<label class="ib" style="width:' . $width . 'px">';
        $string .= '<input type="checkbox" ' . $str . ' id="' . $field . '_' . $i . '" ' . $checked . ' value="' . $key . '"> ' . $value;
        if ($width)
            $string .= '</label>';
        $i++;
    }
    return $string;
}

/**
 * 单选框
 * 
 * @param $array 选项 二维数组
 * @param $id 默认选中值
 * @param $str 属性
 */
function radio($array = array(), $id = 0, $str = '', $width = 0, $field = '') {
    $string = '';
    foreach ($array as $key => $value) {
        $checked = trim($id) == trim($key) ? 'checked' : '';
        if ($width)
            $string .= '<label class="ib" style="width:' . $width . 'px">';
        $string .= '<input type="radio" ' . $str . ' id="' . $field . '_' . $key . '" ' . $checked . ' value="' . $key . '"> ' . $value;
        if ($width)
            $string .= '</label>';
    }
    return $string;
}

/**
 * 字符串加密、解密函数
 *
 *
 * @param	string	$txt		字符串
 * @param	string	$operation	ENCODE为加密，DECODE为解密，可选参数，默认为ENCODE，
 * @param	string	$key		密钥：数字、字母、下划线
 * @param	string	$expiry		过期时间
 * @return	string
 */
function encry_code($string, $operation = 'ENCODE', $key = '', $expiry = 0) {
    $ckey_length = 4;
    $key = md5($key != '' ? $key : config('encry_key'));
    $keya = md5(substr($key, 0, 16));
    $keyb = md5(substr($key, 16, 16));
    $keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length) : substr(md5(microtime()), -$ckey_length)) : '';

    $cryptkey = $keya . md5($keya . $keyc);
    $key_length = strlen($cryptkey);

    $string = $operation == 'DECODE' ? base64_decode(strtr(substr($string, $ckey_length), '-_', '+/')) : sprintf('%010d', $expiry ? $expiry + time() : 0) . substr(md5($string . $keyb), 0, 16) . $string;
    $string_length = strlen($string);

    $result = '';
    $box = range(0, 255);

    $rndkey = array();
    for ($i = 0; $i <= 255; $i++) {
        $rndkey[$i] = ord($cryptkey[$i % $key_length]);
    }

    for ($j = $i = 0; $i < 256; $i++) {
        $j = ($j + $box[$i] + $rndkey[$i]) % 256;
        $tmp = $box[$i];
        $box[$i] = $box[$j];
        $box[$j] = $tmp;
    }

    for ($a = $j = $i = 0; $i < $string_length; $i++) {
        $a = ($a + 1) % 256;
        $j = ($j + $box[$a]) % 256;
        $tmp = $box[$a];
        $box[$a] = $box[$j];
        $box[$j] = $tmp;
        $result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));
    }

    if ($operation == 'DECODE') {
        if ((substr($result, 0, 10) == 0 || substr($result, 0, 10) - time() > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26) . $keyb), 0, 16)) {
            return substr($result, 26);
        } else {
            return '';
        }
    } else {
        return $keyc . rtrim(strtr(base64_encode($result), '+/', '-_'), '=');
    }
}

文章来源: 多级分类展示PHP递归

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