How to divide each element in an array by 2 in php

Implementation steps: 1. Use the foreach statement to traverse the array in a reference loop, with the syntax "foreach ($array as &$value){//loop body statement block;}"; 2. In the loop body , use the "/=" operator to divide all array elements by 2, the syntax is "$value /= 2;", so that after the loop ends, each element in the array will change.

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, DELL G3 computer

In PHP, you can use the foreach statement to reference Modify the array elements in a loop by dividing each element in the array by 2.

Implementation steps:

Step 1: Use the foreach statement to traverse the array in a reference loop

foreach ($array as &$value){
    //循环体语句块;
}

Iterate over the given $array array, assigning the value of the current array to $value in each loop.

Use a reference loop (add & before $value, so that the foreach statement will assign a value by reference instead of copying a value), then operating on the array in the loop body will affect the array itself.

Step 2: In the loop body, use the "/=" operator to divide all array elements by 2

$value /= 2;

Wait for the loop to end, then the array The elements will all change.

Operation	Symbol	Example	Expansion form	Meaning
Divide	/=	$a /= 2	$a = $a / 2	Change the left side of the operator The value of the variable divided by the expression on the right is assigned to the variable on the left

Complete example code:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr=array(2,4,6,8,10,12,14,16,18,20);
echo "原数组：";
var_dump($arr);
foreach($arr as &$value){
	$value /= 2;
}
unset($value); // 最后取消掉引用
echo "数组元素都除以2后：";
var_dump($arr);
?>

Description:

Use the foreach statement to traverse the array in a reference loop. The $value reference of the last element of the array will still be retained after the foreach loop, so there will be a # before the last element. ##&

unset($value); The statement cancels the reference.

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