Detailed explanation of array pointer operation in PHP

This article mainly introduces php array pointer operations. It has a very good reference value. Let’s take a look at it with the editor.

Operation of array pointer:

Operation of moving array pointer :

#Next() will get the value of the current element while going down.

Prev() will get the value of the current element while going up.

End() Move to the last element unit and get the value of the last element

Reset() Move to the first unit and get the value of the first element.

If the move is unsuccessful, return false.

The parameters are all arrays that need to be operated and are passed by reference.

Get information about the element pointed to by the pointer:

Key();//获得当前数组指针指向的元素下标
Current();//获得当前数组指针指向的元素

Only get the data without moving the pointer

There is also a mixed operation:

You can get the information (key value) of the current pointer element and you can also move the pointer at the same time.

Each(); Get the information of the current element (key and value information),

Move the pointer:

We can sometimes use the characteristics of each to achieve the purpose of traversing an array:

It should be completed using a loop structure in conjunction with each.

Matching conditions: When each reaches the last element, it will return false.

List function:

Limitations of List: only works for index arrays.

Use list and each to complete the traversal

But after using each traversal, the array pointer will not be reset and needs to be reset manually. Set.

The above is the entire content of this article, I hope it will be helpful to everyone's study.

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