How to reverse array key-value pairs in php

Methods to reverse key names and values: 1. Use array_flip(), the syntax "array_flip($arr)"; 2. Use array_keys() and array_combine(), the syntax "array_combine($arr, array_keys() $arr))".

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

php reverse array Key-value pairs

Method 1: Use the array_flip() function

The array_flip() function can exchange the keys and values ​​in the array

<?php
header("Content-type:text/html;charset=utf-8");
$arr1=array("aaa"=>11,"bbb"=>22,"ccc"=>33);
echo "原数组：";
var_dump($arr1);

$arr2=array_flip($arr1);
echo "反转数组键值对的数组：";
var_dump($arr2);
?>

Method 2: Using the array_keys() and array_combine() functions

array_keys() function returns all the keys in the array A new array of names.

array_combine() function creates a new array by merging two arrays, where the elements of one array are key names and the elements of the other array are key values.

<?php
header("Content-type:text/html;charset=utf-8");
$arr=array("aaa"=>11,"bbb"=>22,"ccc"=>33);
echo "原数组：";
var_dump($arr);

//获取全部键名
$keys=array_keys($arr);
//合并数组
$flip=array_combine($arr,$keys);
echo "反转数组键值对的数组：";
var_dump($flip);
?>

Recommended learning: "PHP Video Tutorial"

The above is the detailed content of How to reverse array key-value pairs in php. For more information, please follow other related articles on the PHP Chinese website!