How to find the product of an array in php

Two methods for multiplying PHP arrays: 1. Use the foreach statement to loop through the array, and then use the "*" operator in the loop body to multiply the array elements one by one, with the syntax "$f=1; foreach($array as $v){$f*=$v;}". 2. Use the array_product() function to calculate the product of all elements in the array, with the syntax "array_product($array)".

The operating environment of this tutorial: windows7 system, PHP8.1 version, DELL G3 computer

Two ways to multiply arrays in php Method

• Use foreach statement

• Use array_product() function

Method 1: Use foreach statement

1. Use foreach statement to loop through the array

foreach ($array as $value){
    语句块;
}

Traverse the given $array array, in each loop Assign the value of the current array to $value.

2. In the loop body, use the "*" operator to multiply the array elements one by one

$product*=$value;

Full code:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);  
function f($array){
	$product=1;
	foreach ($array as $value) { 
	    $product*=$value;
	}
	echo "数组乘积为：".$product."<br>";
}

$arr1= array(2,3);
var_dump($arr1);
f($arr1);

$arr2= array(2,3,4);
var_dump($arr2);
f($arr2);

$arr3= array(1,2,3,4,5,6,7,8,9,10);
var_dump($arr3);
f($arr3);
?>

Method 2: Use the array_product() function

array_product() is a built-in function in PHP that can return the product of all elements in the array.

Let’s take a look at how array_product() calculates the product of array elements through code examples:

<?php
$array= array(2,3,4);
echo &#39;2 * 3 * 4 = &#39;. array_product($array);

$array= array(3,4,5);
echo &#39;<br>3 * 4 * 5 = &#39;. array_product($array);

$array= array(1,2,3,4,5,6,7,8,9,10);
echo &#39;<br>1 * 2 * 3 *...* 9 * 10 = &#39;. array_product($array);
?>

If there is a non-numeric type in $array elements, then PHP will convert them to a numeric value (implicit data type conversion), and the conversion failure will be treated as a 0 value.

<?php
$array= array(2,"3.1",4);
echo &#39;2 * 3.1 * 4 = &#39;. array_product($array);

$array= array(3,"10.abc",5);
echo &#39;<br>3 * "10.abc" * 5 = 3 * 10 * 5 =&#39;. array_product($array);

$array= array(3,"hello",5);
echo &#39;<br>3 * "hello" * 5 = 3 * 0 * 5 =&#39;. array_product($array);
?>

• The string "3.1" will be converted into a decimal 3.1, so the product of the elements of the first array is 24.8.
  

• #The string "10abc" will be converted to the integer 10, so the product of the elements of the second array is 150.

• The string "hello" cannot be converted to an integer, so as a value of 0, the product of the elements of the third array is 0.

Recommended study: "PHP Video Tutorial"

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