How to remove the first subarray in a two-dimensional array in php

Removal steps: 1. Use foreach to traverse the outer array elements of the two-dimensional array, the syntax is "foreach($arr as $k=>$v){//loop body}"; 2. In the loop body, use the is_array() function to determine whether the outer element is of array type. If so, use unset() to delete the first array type element, and use the break statement to jump out of the entire loop. The syntax "if(is_array($v )){unset($arr[$k]);break;}".

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

php removes 2D Method of the first subarray in the array

##1. Use the foreach statement to loop through the outer array elements of the two-dimensional array

foreach($arr as $k => $v){
//循环体代码
}

2. In the loop body, use the is_array() function to determine whether the outer element is an array type. If so, delete the first sub-array and jump out of the loop.

• If so, use unset() to delete the first array type element, and use the break statement to jump out of the entire loop

if(is_array($v)){
 unset($arr[$k]);
 break;
}

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Complete implementation code:

<?php
header("content-type:text/html;charset=utf-8");
$arr = array(1,2,3,array(4,5,6),7,8,array(9,10)); 
var_dump($arr);
$sum=0;
foreach($arr as $k => $v){
	if(is_array($v)){
		unset($arr[$k]);
		break;
	}
}
var_dump($arr);
?>

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