How to perform string matching and replacement in php

 <?php
    $templ = "{username}是个大{adj}比{end}";//测试字符串
    //对应数据
    $datas = [
        &#39;username&#39; => &#39;我&#39;,
        &#39;adj&#39; => &#39;帅&#39;,
        &#39;end&#39; => &#39;。&#39;,
    ];
    //不需要替换的字符串
    $noMatchs = [&#39;end&#39;];
    function render($datas = array(), $templ = &#39;&#39;, $noMatchs = array()) {
            //preg_replace_callback()
            //执行一个正则表达式搜索并且使用一个回调进行替换
            return  preg_replace_callback(&#39;/\\{([\w\-\/]+)\\}/&#39;, function ($matches) use ($datas, $noMatchs) {
                //$matches[1]返回如：username
                $name = $matches[1];
                if (in_array($name, $noMatchs)) {
                    //$mathches[0]返回如：{end}
                    return $matches[0];
                }
                return array_key_exists($name, $datas) ? $datas[$name] : &#39;&#39;;
            }, $templ);
        }
    var_dump(render($datas, $templ, $noMatchs));
    //输出结果为：&#39;我是个大帅比{end}&#39;