为什么这里不用定义函数的变量类型，话说谁知道你是整形还是字符型？

Answer 1

Why don’t you define the variable type of the function here? Who knows if it is an integer or a character? -PHP Chinese website Q&A-Why don't you define the variable type of the function here? Who knows whether it is an integer or a character? -PHP Chinese website Q&A

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Answer 2

PHP不用像其他一样的明确变量类型，只要定义了就行。