How to multiply array elements by 10 in php to change this array

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 multiply all array elements by 10, the syntax is "$value *= 10;".

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

php Lieutenant General Array Method to change this array by multiplying the elements by 10

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

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

Traverse Given the $array array, assign the value of the current array to $value in each loop.

Note:

• Generally, when using the foreach statement to traverse an array, it operates on the backup of the array and generally does not affect the array itself.

• But sometimes it is necessary to change the array through a loop. In this case, a reference loop can be used (add & before $value, In this way, the foreach statement will assign a value by reference instead of copying a value), so operating on the array within the loop body will affect the array itself.

Step 2: In the loop body, use the "*=" operator to multiply all array elements by 10

$value *= 10;

Wait for the end of the loop , the array elements will all change.

Complete sample code:

<?php
header('content-type:text/html;charset=utf-8');   
$arr=array(1,2,3,4,5,6,7,8,9,10);
echo "原数组：";
var_dump($arr);
foreach($arr as &$value){
	$value *= 10;
}
echo "数组元素都乘以10后：";
var_dump($arr);
?>

It can be seen that before the last element, there is a &, that's because the $value reference of the last element of the array will still be retained after the foreach loop. We need to use unset() to destroy it.

unset($value); // 最后取消掉引用

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