PHP array operation method to calculate the sum of all elements of an array

In the previous article "How to merge arrays in PHP array operations? "Summary of Common Methods" provides a detailed introduction to the relevant knowledge of common array merging in several PHP array operations. In this article, we will continue to look at the relevant knowledge of PHP array operations. I hope it will be helpful to everyone!

In the previous article we introduced how to merge arrays in PHP, which can be done through the array_merge function, array_merge_recursive Function and the array_combine function are implemented. In PHP array operations, the sum and product of all elements of the array can also be calculated.

In PHP, you can calculate the sum of all elements of an array through for loops, foreach loops, and the built-in function array_sum(). Let's start with the most familiar and simple for loop method and introduce the implementation methods one by one.

Through the for loop

In our previous article "How to use the For loop in PHP and Foreach Loop (Detailed Graphical Explanation) " We introduced the for loop statement. Interested friends can click on the link to view it. Let us directly use an example to see how to calculate the sum of all elements through a for loop. The example is as follows:

<?php
//通过for循环
$array= array(&#39;24k&#39;,&#39;56kg&#39;,&#39;180cm&#39;,8,100,&#39;100.1&#39;,&#39;3.1415926&#39;);
$sum=0;
for ($i=0; $i < count($array); $i++) {
    $sum+=$array[$i];
}
echo &#39;通过for循环得到：&#39;. $sum;
?>

Output result:

In this way, we use the for loop to calculate the sum of the array elements, but what needs to be noted is that , if there is an element with no value in the array calculated in the for loop, although the program will treat it as 0 and the output result will be normal, an error will be displayed in the output result.

Next, let’s take a look at the foreach loop, which is similar to the for loop.

Through foreachLoop

In the article mentioned above, not only the for loop but also the foreach are introduced Loop, we won’t make too many statements below. Let’s take a look at how to calculate the sum of array elements through the use of foreach function. The example is as follows:

<?php
header("Content-type:text/html;charset=utf-8");
//通过for循环
$array= array(&#39;24k&#39;,&#39;56kg&#39;,&#39;180cm&#39;,8,100,&#39;100.1&#39;,&#39;3.1415926&#39;);
$sum=0;
for ($i=0; $i < count($array); $i++) {
    $sum+=$array[$i];
}
echo &#39;通过for循环得到：&#39;. $sum;
echo &#39;<br/>&#39;;
//通过foreach循环
$sum1=0;
foreach ($array as $value) {
    $sum1+=$value;
}
echo &#39;通过foreach循环得到：&#39;. $sum1;
?>

Output result:

In this way, we complete the calculation of the element sum of the array through foreach. Adding array elements through for loops and foreach loops is always a bit complicated. There is a built-in function array_sum function in PHP that can easily solve this problem. Let's take a look at how to calculate it through array_sum.

<strong><span style="max-width:90%">array_sum()</span></strong>Function

Pass The array_sum function can calculate the sum of all elements in the array. The basic syntax format of the array_sum function is as follows:

array_sum(array)

It should be noted that the parameter array needs to calculate the sum of all elements. Array, the returned results are all returned as integers or floating point numbers. If the array is an empty array, the returned result is 0.

If the elements in this array are not all numeric values, the PHP function will try to convert the element into a numeric value. If it cannot be converted, then the value will be regarded as 0, for example, a string "10.1" is not in the form of a numerical value, but in the form of a string. After conversion, the sum of the elements is calculated in the form of the numerical value 10.1.

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

<?php
$a = array(1, 2, 3, 4);
echo array_sum($a);
?>

Output result:

Above In the example, all the array elements are numerical values. In this case, the elements can be added directly without conversion. Let's take a look at how the string is converted. The example is as follows:

<?php
$b = array(100, &#39;1&#39;, "0.01");
echo array_sum($b);
?>

Output Result:

In the above example, the elements of the string are converted. The string "0.01" is directly converted into the value 0.01. There are also some that can be converted and some Array elements that cannot be converted, examples are as follows:

<?php
$c = array(&#39;24k&#39;,&#39;56kg&#39;,&#39;180cm&#39;,&#39;argrg&#39;);
echo array_sum($c);
?>

Output result:

Through the above examples, some strings can be converted, Like "24k" in the example, but "argrg" cannot be converted and can only be regarded as a value of 0. Below we write out all three methods. The examples are as follows:

<?php
header("Content-type:text/html;charset=utf-8");
//通过array_sum函数
$c = array(&#39;24k&#39;,&#39;56kg&#39;,&#39;180cm&#39;,&#39;argrg&#39;,8,100,&#39;100.1&#39;,&#39;3.1415926&#39;);
echo &#39;通过array_sum函数得到：&#39; . array_sum($c);
echo &#39;<br/>&#39;;
//通过for循环
$array= array(&#39;24k&#39;,&#39;56kg&#39;,&#39;180cm&#39;,8,100,&#39;100.1&#39;,&#39;3.1415926&#39;);
$sum=0;
for ($i=0; $i < count($array); $i++) {
    $sum+=$array[$i];
}
echo &#39;通过for循环得到：&#39;. $sum;
echo &#39;<br/>&#39;;
//通过foreach循环
$sum1=0;
foreach ($array as $value) {
    $sum1+=$value;
}
echo &#39;通过foreach循环得到：&#39;. $sum1;
?>

Output results:

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