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php-PHP 一个类里能直接调用类外部的函数吗?为什么

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PHP 一个类里能直接调用类外部的函数吗?
PHP 一个类里能直接调用类外部的函数吗?
PHP 一个类里能直接调用类外部的函数吗?
PHP 一个类里能直接调用类外部的函数吗?
PHP 一个类里能直接调用类外部的函数吗?

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