How to remove a certain value from a two-dimensional array in php

Removal steps: 1. Loop through the outer array elements of the two-dimensional array, the syntax is "foreach($arr as $k=>$v){loop body code}"; 2. In the loop body , use unset() to remove the specified value, the syntax "if(is_array($v)){$ck=array_search(value,$v);if($ck){unset($arr[$k][$ck] );}}else{if($v===value){unset($arr[$k]);}}".

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, DELL G3 computer

In PHP, you can use the foreach statement and combine it The unset() function deletes a specified value in a two-dimensional array.

Implementation steps:

Step 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
}

Traverse the given $arr array, and in each loop, the value of the current array will be assigned to $v, and the key name will be assigned to $k.

Step 2: In the loop body, remove the specified value in the two-dimensional array

Use the is_array() function to determine whether the outer element is an array type (whether it is Subarray)

• If so, use array_search() to get the key name corresponding to the specified value, and then use the unset() function to delete the element based on the key name

• If not, directly use "===" to determine whether the current element is the specified element, and if so, use the unset() function to delete the element.

if (is_array($v)) {
	$ck = array_search(指定值, $v);
	if ($ck) {
		unset($arr[$k][$ck]);
	}
} else {
	if ($v === 指定值) {
		unset($arr[$k]);
	}
}

Complete implementation code: remove 1 in the two-dimensional array

<?php
header("content-type:text/html;charset=utf-8");
$arr = array(1, 2, 3, array(4, 1, 6), array(7, 8, 9, 10));
echo "原数组：";
var_dump($arr);
foreach ($arr as $k => $v) {
	if (is_array($v)) {
		$ck = array_search(1, $v);
		if ($ck) {
			unset($arr[$k][$ck]);
		}
	} else {
		if ($v === 1) {
			unset($arr[$k]);
		}
	}
}
echo "去除元素1后：";
var_dump($arr);
?>

Recommended study: " PHP video tutorial》

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