How to reverse array values ​​in php

In PHP, you can use the array_flip function to reverse the key names and corresponding associated key values ​​in the array. The syntax is "array_flip(array);". The parameter array specifies the array that needs to be reversed.

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array_flip() function is used to reverse/exchange elements in an array Key name and corresponding associated key value.

Syntax

array_flip(array);

Parameters

array required. Specifies the array whose key/value pairs need to be reversed.

Technical details

Return value: If the inversion is successful, the reversed array is returned. If the reversal fails, NULL is returned.

PHP version: 4

Example:

<?php
$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$result=array_flip($a1);
print_r($result);
?>

Run result:

Array ( [red] => a [green] => b [blue] => c [yellow] => d )

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