How to convert array to index array in php

Two conversion methods: 1. Use the array_values() function to convert the array into an index array. The original key name will be converted into a numeric key name starting from 0 and increasing by 1. The syntax "array_values($arr )". 2. Define an empty array, use the foreach statement to loop through the original array, and pass the key values ​​of the original array into the empty array in the loop body. The syntax is "$res=[];foreach($arr as $v){$ res[]=$v;}".

The operating environment of this tutorial: windows7 system, PHP8.1 version, DELL G3 computer

php will convert the array Two methods for indexing arrays

Method 1: Use the array_values() function to convert the array into an index array

array_values() function The function is to return the values ​​​​of all elements in the array

array_values(array)

It is very simple to use. With only one required parameter, you can return an array containing all the values ​​​​in the given array, but do not retain the key name. The returned array will be in the form of an indexed array, with array indices starting at 0 and increasing by 1.

Simply put, you can use this function to reset the array key name and convert the key name with confusing string or numerical value into a numeric key name starting from 0 and increasing by 1.

array_values() function is particularly suitable for arrays with confusing element subscripts (numeric keys can be reset), or for converting associative arrays into indexed arrays.

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);  
$arr=array("Peter"=>65,"Harry"=>80,"John"=>78,"Clark"=>90,2,3,4);
echo "原数组：";
var_dump($arr);
$res=array_values($arr);
echo "转为索引数组后：";
var_dump($res);
?>

Method 2: Use a foreach loop and an empty array to convert the array into an index array

• Use the foreach statement to loop through the original array

• In the loop body, pass the key value of the original array into the empty array

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);  
$arr=array(2,"Peter"=>65,3,"Harry"=>80,4,"John"=>78,"Clark"=>90);
echo "原数组：";
var_dump($arr);
$res=[];
foreach($arr as $v){
    $res[]=$v;
}
echo "转为索引数组后：";
var_dump($res);
?>

Explanation:

The syntax of empty array assignment:

$数组变量名[键名] = 值;

When assigning a value to an empty array, you do not need to specify the specific key name within the square brackets value. At this time, the key name value defaults to a numerical value, and increases sequentially starting from 0.

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