How to delete the first element of php array

php method to delete the first element in the array: 1. Use the array_shift() function, the syntax "array_shift(array);"; 2. Use the array_splice() function, the syntax "array_splice(array,0, 1);".

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

php delete array The first element

1. Use the array_shift() function

PHP array_shift() function is used to delete the elements at the beginning of the array. The syntax is as follows:

array_shift(array)

The parameter arr represents the array to be processed.

array_shift() function will delete the first element at the beginning of the arr array and return it as the result. The length of the arr array is decremented by 1 and all other elements are moved forward by one. All numeric key names will be changed to start counting from 0, and string key names will remain unchanged.

Return value: Returns the value of the element removed from the array, or NULL if the array is empty.

Example: Delete the first element in the array

<?php
header("Content-type: text/html; charset=utf-8");
$num = array(10, 45, 9, 100, 6);
array_shift($num);  //删除数组开头的第一个元素
print_r($num);

echo "<br>";

$info = array("PHP教程", 4=>"php中文网", "//m.sbmmt.com",);
array_shift($info);
print_r($info);
?>

The result of executing the above program is:

Array ( [0] => 45 [1] => 9 [2] => 100 [3] => 6 )
Array ( [0] => php中文网 [1] => //m.sbmmt.com )

2. Use the array_splice() function

PHP array_splice() function is used to delete part of the elements of the array; you can delete them directly or replace them with other values.

array_splice() syntax is as follows:

array_splice(array1,start,length,array2)

Tip: If the function does not remove any elements (length=0), the replacement array will be inserted from the position of the start parameter.

Return value: Returns the array containing the extracted elements.

Example: Delete the first element in the array

<?php
$arr = array("red", "green", "blue", "yellow");
array_splice($arr, 0,1);
print_r($arr);
?>

Output:

Array ( [0] => green [1] => blue [2] => yellow )

Recommended learning: "PHP Video Tutorial"

The above is the detailed content of How to delete the first element of php array. For more information, please follow other related articles on the PHP Chinese website!