Php 分析错误：语法错误，意外“，”预匹配

我不断得到错误：

第97行：

我该如何解决这个问题

if (preg_match('/['.unichr(0x1F300).'-'.unichr(0x1F5FF).unichr(0xE000).'-'.unichr(0xF8FF).']/u', $_POST['username'])) {

将右前角拆下

这样可能更容易发现：

 $pattern = '/['.unichr(0x1F300).'-'.unichr(0x1F5FF).
            unichr(0xE000).'-'.unichr(0xF8FF).']/u';
 if (preg_match($pattern, $_POST['username'])) {

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这是保持行短和使用良好IDE的一个很好的理由。

在第二个参数前加上括号。

if (preg_match('/['.unichr(0x1F300).'-'.unichr(0x1F5FF).unichr(0xE000).'-'.unichr(0xF8FF).']/u', $_POST['username'])) {

 $pattern = '/['.unichr(0x1F300).'-'.unichr(0x1F5FF).
            unichr(0xE000).'-'.unichr(0xF8FF).']/u';
 if (preg_match($pattern, $_POST['username'])) {