Detailed explanation of php array_unshift() function (example)

array_unshift() function is used to insert new elements into the array and return the number of elements in the new array. The values ​​of the new array will be inserted at the beginning of the array.

(Recommended tutorial: php graphic tutorial)

Tip: You can insert one or more values. Numeric key names will start at 0 and increase by 1. String key names will remain unchanged.

Function syntax:

array_unshift(array,value1,value2,value3...)

Parameter description:

• array Required. Specifies an array.

• #value1 Required. Specifies the value to be inserted.

• #value2 Optional. Specifies the value to be inserted.

• #value3 Optional. Specifies the value to be inserted.

(Learning video recommendation: php video tutorial)

Example:

<?php
$a=array("a"=>"red","b"=>"green");
array_unshift($a,"blue");
print_r($a);
?>

Run result:

Array ( [0] => blue [a] => red [b] => green )

The above is the detailed content of Detailed explanation of php array_unshift() function (example). For more information, please follow other related articles on the PHP Chinese website!