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This article mainly explains "how php removes the first element of an array". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "php how to eliminate the first element of an array".

Elimination methods: 1, with array_shift () function, syntax "array_shift ($arr)"; 2, with array_splice () function, syntax "array_splice ($arr,0,1)"; 3, with "array_slice ($arr,1)" statement.

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

Php weeds out the first element of the array

Method 1: use the array_shift () function

The PHP array_shift () function deletes the elements at the beginning of the array

As you can see in this example, our original $arr array has five elements. After using the array_shift ($arr) method, we re-use var_dump ($arr) to output the array, and we find that there are only four elements left, and the array header element has been deleted.

After the array_shift ($arr) function deletes the first element at the beginning of the $arr array, the length of the arr array is reduced by 1 and all other elements are moved forward one bit. If the key name is numeric, all elements will get the new key name, starting at 0 and incrementing by 1, but the string key name will remain the same.

And after we perform the delete operation, we output the original array to see whether the element is deleted. It is not difficult to find that array_shift () will change the original array.

Method 2: use the array_splice () function

The array_splice () function is used to delete some elements of the array; you can delete it directly or replace it with other values.

Example: delete the first element in the array

Method 3: use the array_slice () function

The array_slice () function is used to intercept an array, that is, to extract a fragment from the array.

Return value: returns the intercepted subarray.

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