PHP matches Chinese characters

The Chinese character matching in java is [u4E00-u9FA5]. Naturally, after using this regular expression in PHP, the following error was reported:

Warning: preg_match_all():Compilation failed: PCRE does not support L, l, N {name}, U, or u at offset 6 in D:xampphtdocstestindex.php on line 7

Later I discovered that x represents hexadecimal in PHP. So I changed the regular expression to [x4E00-x9FA5], but the following error will still be reported:

Warning: preg_match_all(): Compilation failed: invalid UTF-8 string at offset 9 in
D:xampphtdocstestindex.php on line 7
It seems to be another regular expression problem. Finally, just change the regular expression to [x{4E00}-x{9FA5}].

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The above introduces the matching of Chinese characters in PHP, including aspects of the content. I hope it will be helpful to friends who are interested in PHP tutorials.