How to remove key (key name) from two-dimensional array in php

Removal steps: 1. Define an empty array to store the array elements with the key removed, with the syntax "$res=[];"; 2. Use the foreach statement to loop through the outer elements of the two-dimensional array, Syntax "foreach($arr as $v){//loop body code}"; 3. In the loop body, remove the key (key name) of the two-dimensional array, syntax "if(is_array($v)){$res []=array_values($v);}else{$res[]=$v;}".

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

In php, you can use foreach statement and the array_values() function to remove the key (key name) of the two-dimensional array.

Implementation steps:

Step 1: Define an empty array to store the array elements with the key (key name) removed

$res=[];

Step 2: Use the foreach statement to loop through the outer array elements of the two-dimensional array

foreach($arr as $v){
//循环体代码
}

Traverse the given $arr array, in each loop Will assign the value of the current array to $v.

Step 3. In the loop body, remove the key (key name) of the outer and inner array elements

Use the is_array() function to determine the outer layer Whether the element is an array type (that is, whether it is the inner array of a two-dimensional array)

• If so, use the array_values() function to remove the key (key name) of the inner array , and assign it to the empty array $res
  

• If not, directly assign the key value of the outer element to the empty array $res

if(is_array($v)){
	$res[]=array_values($v);
}else{
	$res[]=$v;
}

After the loop ends, the $res array is a two-dimensional array with the key (key name) removed.

Complete implementation code:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr = array(
"a"=>1,
"b"=>2,
"c"=>array("c1"=>3,"c2"=>4,"c3"=>5,"c4"=>6),
"d"=>6,
"e"=>array("e1"=>7,"e2"=>8,"e3"=>9,"e4"=>10),
"f"=>10,
"g"=>array("g1"=>11,"g2"=>12,"g3"=>13)
);
echo "原二维数组：";
var_dump($arr);

$res=[];
foreach($arr as $v){
if(is_array($v)){
	$res[]=array_values($v);
}else{
	$res[]=$v;
}
}
echo "去掉key（键名）的二维数组：";
var_dump($res);
?>

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