Detailed explanation of php array_shift() function: delete the first element in the array

What is the function of php array_shift() function?

The array_shift() function in php deletes the first element in the array and returns the value of the deleted element. This article introduces the usage and definition of the php array_shift() function in detail. If you are interested, you can take a look. I hope it will be helpful to everyone.

Definition and usage

array_shift() function deletes the first element in the array and returns the value of the deleted element, or NULL if the array is empty. . If the key name is numeric, all elements will get new key names, starting from 0 and incrementing by 1 (refer to the code in Example 2 below), and the literal key values ​​will remain unchanged.

Syntax

array_shift(array)

The parameter array is a specified array and must be specified.

Example 1

Use the php array_shift() function to delete the first element in the $stack array and return the deleted element. The code is as follows

<?php
$stack = array("orange", "banana", "apple", "raspberry");
$fruit = array_shift($stack);
print_r($stack);
?>

The code execution output is:

After the above code deletes the first element in the $stack array, The element orange is assigned to $fruit.

Example 2

Use the php array_shift() function to delete the array with numeric key names. The code is as follows:

<?php
$a=array(0=>"red",1=>"green",2=>"blue");
echo array_shift($a);
print_r ($a);
?>

The code running output results:

You can see that the key name of the original element "green" is "1", but after using the array_shift() function, all key names will start from 0

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