The difference between pass by value and pass by reference PHP

php value passing: Within the function scope, changing the variable value will not affect the variable value outside the function.

php by reference: Within the scope of the function, any changes to the value are also reflected outside the function, because the memory address is passed by reference.

Explanation with examples:

Passing value: It is the same as copy. [For example, I have a house. I give you building materials. You build a house that is exactly the same as mine. Whatever you do in your house will not affect me. What I do in my house will not affect me. Nothing will affect you, independent of each other. 】

Passing by reference: Similar to pointers in C language, it feels almost the same. For example, I have a house. If I give you a key, both of us can enter the house. Whatever you do in the house will affect me.

Advantages and Disadvantages: Passing values will be time-consuming, especially for large strings and objects, this will be a very expensive operation, transferring references, functions Any operation within is equivalent to the operation of the transferred variable, and it is efficient when transferring large variables!

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