除了在php.ini中开起扩展之外，还需要复制

• icudt36.dll
• icuin36.dll
• icuio36.dll
• icule36.dll
• iculx36.dll
• icutu36.dll
• icuuc36.dll

原文为：

For the php_intl.dll extension to work correctly, you need to have the following files in a folder in your PATH:

• icudt36.dll
• icuin36.dll
• icuio36.dll
• icule36.dll
• iculx36.dll
• icutu36.dll
• icuuc36.dll

By default they're sitting in your PHP directory, but that directory isn't necessarily in your PATH (it wasn't for me, using xampp)

注意有些版本的xampp里面没有这些文件，PHP官方的包里是有的。

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