PHP中的自定义JavaScript压缩

我试图用PHP实现自己的javascript压缩。除了一件小事，一切都很好

private $search = array("   ", " ","new", "return", "var", "function", "\r\n", "\n", "\r");
private $replace = array("", "","new ", "return ", "var ", "function ","", "", "");
private $comments = "/(?:(?:\/\*(?:[^*]|(?:\*+[^*\/]))*\*+\/)|(?:(?<!\:|\\\)\/\/.*))/";
/*$ctx are the file contents */
$ctx = preg_replace($this->comments, "", $ctx);
$ctx = str_replace($this->search, $this->replace, $ctx);

替换代码返回的结果如下

$str = "function (){return 'Thisismyname'}";

是否有正则表达式或其他方法来解决此问题？

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提前谢谢

缩小脚本比您想象的要复杂得多，您应该使用可用的众多压缩器中的一个，而不是尝试重新发明轮子，这里有一个->缩小器不能直接在代码上作为字符串工作。他们在通过解析代码获得的AST（抽象语法树）上完成工作。你会发现这个演讲很有趣：

$str = "function (){return 'Thisismyname'}";