How to convert array value to key by php

In this article, Xiaobian introduces in detail "how php converts array value to key" with detailed content, clear steps and proper handling of details. I hope that this article "how php converts array value to key" can help you solve your doubts.

Three methods: 1, use the "array_flip ($arr)" statement; 2, use the "array_combine ($arr,array_keys ($arr))" statement; 3, use the "foreach ($arr1 as $k = > $v) {$arr2 [$v] = $k;}" statement.

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

Php converts the array value to key, that is, converting the keys and values in the array to each other. Here are three methods:

Method 1: use the array_flip () function

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

Method 2: use the array_keys () + array_combine () function

Realize the idea:

Use array_keys () to get the key names in the array and return the array of key names

Use array_combine () to merge the original array as the key name and the key name array as the key value to form a new array

Method 3: use foreach loop and an empty array

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