PHP array operation method to calculate the product of array elements

In the previous article "PHP Array Operation: Method of Calculating the Sum of All Elements in an Array", we introduced in detail the relevant knowledge on how to calculate the sum of all elements in an array in PHP. In this article we will continue Let’s take a look at the knowledge of arrays in PHP. After reading how to calculate the sum of the elements of an array, let’s look at how to calculate the product of the elements of an array. I hope everyone has to help!

In the previous article we learned that we want to calculate the element sum of array elements, we can use the for loop sum we learned at the beginning foreachLoop, these two methods are a bit complicated. There is a built-in array_sum function in PHP that can calculate the sum of elements in an array.

If you want to calculate the product of array elements, it is very simple. It is similar to calculating the sum of array elements. You can use for loop and foreach loop. The same is true in PHP. There is a built-in function array_product that can calculate the product of array elements. Let’s introduce these three methods separately.

Through for loop

In the previous article "How to use For loop and Foreach in PHP Loop (detailed picture and text) " We have already introduced the for loop in PHP, so we won’t go into too much detail here. Let’s look directly at an example of how to use a for loop. Multiply the array elements. The example is as follows:

<?php
$array= array(&#39;24&#39;,&#39;56&#39;,&#39;180&#39;,8,100,&#39;100.1&#39;,&#39;3.5&#39;);
$sum=1;
for ($i=0; $i < count($array); $i++) {
    $sum*=$array[$i];
}
echo &#39;通过for循环得到：&#39;. $sum;
?>

Output result:

Through the above example we found that among the array elements, not only When there are only numerical values, there are strings like "24" and "56" in the example, which are not numerical values ​​and will be converted into numerical values ​​and added to the multiplication team.

Friends who have read the previous article on summation may have noticed that the difference between the code and the previous article is not only that the summation process has changed, but also that the variable $sum has become 1 , because it is used to calculate multiplication, so it was changed to 1.

Another situation is that the elements in the array are not just numerical values. What will happen if other strings appear? Let’s take a look at an example. The example is as follows:

<?php
$array= array(&#39;24k&#39;,&#39;56kg&#39;,&#39;180cm&#39;,8,100,&#39;100.1&#39;,&#39;3.5&#39;);
$sum=1;
for ($i=0; $i < count($array); $i++) {
    $sum*=$array[$i];
}
echo &#39;通过for循环得到：&#39;. $sum;
?>

Output result:

In the above example, the elements in the array Not just strings, but also strings with numerical elements like "24k" and "56kg". In this case, they will also be automatically converted into numerical values.

The above is the process of performing quadrature of array elements through for loop. Next, let’s take a look at how to perform quadrature through foreach loop.

ThroughforeachLoop

As usual, let’s take a look at the use of foreach through examples. The examples are as follows:

<?php
$array= array(&#39;24k&#39;,&#39;56kg&#39;,&#39;180cm&#39;,8,100,&#39;100.1&#39;,&#39;3.5&#39;);
//通过for循环
$sum=1;
for ($i=0; $i < count($array); $i++) {
    $sum*=$array[$i];
}
echo &#39;通过for循环求得数组内元素的积为：&#39;. $sum;
echo &#39;<br/>&#39;;
//通过foreach循环
$sum1=1;
foreach ($array as $value) {
    $sum1*=$value;
}
echo &#39;通过foreach循环求得数组内元素的积为：&#39;. $sum1;
?>

Output result:

As you can see from the above example, the foreach loop, like the for loop, will convert the string elements in the array. Let's introduce the built-in array_product function in PHP.

Through the array_product function

In PHP, you can use the array_product function to perform array operations For calculation of multiplication, the basic syntax format of the array_product function is as follows:

array_product(array)

It should be noted that the parameter array is the array to be multiplied, and the result returned after the function is run is the array. The product of all elements within. where this element is an integer and a floating point number. If this array is an empty array, the result returned after PHP5.3.6 will be 1.

Let’s take a look at the use of function array_product through an example. The example is as follows:

<?php
$array= array(&#39;24k&#39;,&#39;56kg&#39;,&#39;180cm&#39;,8,100,&#39;100.1&#39;,&#39;3.5&#39;);
//通过for循环
$sum=1;
for ($i=0; $i < count($array); $i++) {
    $sum*=$array[$i];
}
echo &#39;通过for循环求得数组内元素的积为：&#39;. $sum;
echo &#39;<br/>&#39;;
//通过foreach循环
$sum1=1;
foreach ($array as $value) {
    $sum1*=$value;
}
echo &#39;通过foreach循环求得数组内元素的积为：&#39;. $sum1;
echo &#39;<br/>&#39;;
//通过array_product函数
echo &#39;通过array_product函数求得数组内元素的积为：&#39;. array_product($array);
?>

Output result:

From this we calculated the array through three methods: for loop, foreach loop and array_product function Product of elements.

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