求帮忙把这个JS翻译为PHP版本

[逍遥混世]

function  uniqid(prefix, more_entropy) {
            if (typeof prefix == 'undefined') {
                prefix = "";
            }

            var retId;
            var formatSeed = function (seed, reqWidth) {
                seed = parseInt(seed, 10).toString(16); // to hex str
                if (reqWidth < seed.length) { // so long we split
                    return seed.slice(seed.length - reqWidth);
                }
                if (reqWidth > seed.length) { // so short we pad
                    return Array(1 + (reqWidth - seed.length)).join('0') + seed;
                }
                return seed;
            };

            if (!this.php_js) {
                this.php_js = {};
            }
            if (!this.php_js.uniqidSeed) { // init seed with big random int
                this.php_js.uniqidSeed = Math.floor(Math.random() * 0x75bcd15);
            }
            this.php_js.uniqidSeed++;

            retId = prefix; // start with prefix, add current milliseconds hex string
            retId += formatSeed(parseInt(new Date().getTime() / 1000, 10), 8);
            retId += formatSeed(this.php_js.uniqidSeed, 5); // add seed hex string
            if (more_entropy) {
                // for more entropy we add a float lower to 10
                retId += (Math.random() * 10).toFixed(8).toString();
            }

            return retId;
        }

[傲雪星枫]

php自带就有这个方法，不需要自己写，而你的方法，就是用php的方法转用js写的。

uniqid — 生成一个唯一ID

说明
string uniqid ([ string $prefix = "" [, bool $more_entropy = false ]] )

<?php
echo uniqid();
?>

http://www.w3school.com.cn/php/func_misc_uniqid.asp