如何在php中使用javascript函数？

我有以下javascript代码：

var _keyStr = "ZYX10+/PONM765LKJIAzyTSRQGxwvuHWVFEDUCBtsrqdcba9843ponmlkjihgfe2";

function _utf8_decode(e) {
    for (var t = "", i = 0, o = c1 = c2 = 0; i < e.length;)(o = e.charCodeAt(i)) < 128 ? (t += String.fromCharCode(o), i++) : o > 191 && o < 224 ? (c2 = e.charCodeAt(i + 1), t += String.fromCharCode((31 & o) << 6 | 63 & c2), i += 2) : (c2 = e.charCodeAt(i + 1), c3 = e.charCodeAt(i + 2), t += String.fromCharCode((15 & o) << 12 | (63 & c2) << 6 | 63 & c3), i += 3);
    return t
}

function decode(e) {
    var t, i, o, s, a, r, n = "",
        l = 0;
    for (e = e.replace(/[^A-Za-z0-9+\/=]/g, ""); l < e.length;) t = _keyStr.indexOf(e.charAt(l++)) << 2 | (s = _keyStr.indexOf(e.charAt(l++))) >> 4, i = (15 & s) << 4 | (a = _keyStr.indexOf(e.charAt(l++))) >> 2, o = (3 & a) << 6 | (r = _keyStr.indexOf(e.charAt(l++))), n += String.fromCharCode(t), 64 != a && (n += String.fromCharCode(i)), 64 != r && (n += String.fromCharCode(o));
    return n = _utf8_decode(n)
}

var _keyStr=“ZYX10+/PONM765LKJIAzyTSRQGxwvuHWVFEDUCBtsrqdcba9843ponmlkjihgfe2”；
功能_utf8_解码（e）{
对于（var t=”，i=0，o=c1=c2=0；i191&&o<224？（c2=e.charCodeAt（i+1），t+=String.fromCharCode（（31&o），从它的外观来看，它只是一个自定义键对的base64？那么为什么不这样做呢

function decode($input) {
    $custom = 'ZYX10+/PONM765LKJIAzyTSRQGxwvuHWVFEDUCBtsrqdcba9843ponmlkjihgfe2';
    $default = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
    $decoded = base64_decode(strtr($input, $custom, $default));
    return $input;
}

这是基于
中的代码，从外观上看，它只是带有自定义密钥的base64，对吗？那么为什么不这样做呢

function decode($input) {
    $custom = 'ZYX10+/PONM765LKJIAzyTSRQGxwvuHWVFEDUCBtsrqdcba9843ponmlkjihgfe2';
    $default = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
    $decoded = base64_decode(strtr($input, $custom, $default));
    return $input;
}

这是基于