How to detect the existence of subarray elements in php two-dimensional array

Detection steps: 1. Use the foreach statement to loop through 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 is_array() to determine whether the outer element "$v" is an array type. If so, use in_array() to determine whether the specified element is in the subarray. The syntax is "if(is_array($v)) {if(in_array(specified element,$v)){//Existence operation}}".

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 is_array () and in_array() functions to detect the existence of subarray elements.

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, use the is_array() function and the in_array() function to determine whether the subarray element exists

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

• If so, use the in_array() function to determine whether the specified element is in the subarray

if(is_array($v)){
		if(in_array(指定元素,$v)){
			echo "指定子数组元素存在";
			break;
		}
}

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);
foreach($arr as $k => $v){
	if(is_array($v)){
		if(in_array("9",$v)){
			echo "指定子数组元素存在";
			break;
		}
		
	}
}
?>

<?php
header("content-type:text/html;charset=utf-8");
function f($arr,$s){
	$c=0;
	foreach($arr as $k => $v){
		if(is_array($v)){
			if(in_array($s,$v)){
				$c=1;
				break;
			}
		}
	}
	if($c==1){
		echo "指定子数组元素 $s 存在<br>";
	}else{
		echo "指定子数组元素 $s 不存在<br>";
	}
}


$arr = array(1,2,3,array(4,5,6),7,8,array(9,10)); 
var_dump($arr);
f($arr,9);
f($arr,11);
?>

Description:

in_array ( $search , $array ,$strict)

Recommended study: "

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