How to delete the first element of an array in php

In PHP, deleting an array element is not a difficult thing. You only need to use the array_shift() function to delete the first array element and return the deleted element.

The syntax of the array_shift() function is as follows:

mixed array_shift ( array &$array )

This function receives an array as a parameter and returns the value of the first element deleted in the array. If the array is empty, NULL is returned.

The following is a sample program to delete the first array element:

<?php
    $languages = array("PHP", "JavaScript", "Java", "C#", "Ruby");
    $firstLanguage = array_shift($languages);
    echo "删除的第一个语言是：" . $firstLanguage . "<br>";
    echo "新的数组内容是：<br>";
    print_r($languages);
?>

The running result is:

删除的第一个语言是：PHP
新的数组内容是：
Array
(
    [0] => JavaScript
    [1] => Java
    [2] => C#
    [3] => Ruby
)

As can be seen from the above code:

• The first element "PHP" in the array is deleted, and the return value is "PHP".
• The array is re-indexed, and the first element in the new array becomes the second element of the original array.
• When the print_r() function is called to print the array, the array no longer contains the deleted element "PHP".

It should be reminded that when using the array_shift() function to delete the first element of the array, you need to pay attention to the following points:

1. The first element of the array is After deletion, the key names of other elements will automatically move forward. If necessary, the array can be re-indexed using the array_values() function.
2. When the array is empty, calling the array_shift() function will return NULL, and the return value cannot be processed at this time.
3. Before using the array_shift() function to delete array elements, you need to ensure that the array already exists.

In short, using the array_shift() function can easily delete the first element of an array, making our PHP code simpler and more efficient.

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