How to calculate the product of a two-dimensional array in PHP

Qualification steps: 1. Define a variable and assign a value of 1, the syntax "$cj=1;"; 2. Use a foreach loop to traverse the outer array elements, the syntax "foreach($arr as $v) {//Loop body code}"; 3. In the loop body, use is_array(), array_product() and "*=" operator to calculate the product, the syntax is "if(is_array($v)){$cj*= array_product($v);}else{$cj*=$v;}".

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

In PHP, you can use the foreach statement and is_array (), array_product() function to find the product of all elements in a two-dimensional array.

Implementation steps:

Step 1: Define a variable and assign a value of 1 to store the quadrature result

$cj=1;

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, and in each loop, The current value of the outer array is assigned to $v.

Step 3. In the loop body, use the is_array() function to determine whether the outer element is an array type, and use array_product() and the "*=" operator to calculate the product

• If it is not an array type, use the "*=" operator to multiply the outer elements that are not arrays

• If it is an array type, use the array_product() function to calculate the product of all elements in the inner array and multiply it with the sum of the outer elements.

if(is_array($v)){
	$cj*=array_product($v);
}else{
	$cj*=$v;
}

Complete sample code:

<?php  
header("content-type:text/html;charset=utf-8");
$arr = array(1,array(2,4),6); 
var_dump($arr);
$cj=1;
foreach($arr as $v){
	if(is_array($v)){
		$cj*=array_product($v);
	}else{
		$cj*=$v;
	}
}
echo "二维数组的积为：".$cj;
?>

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