Overwriting Array Elements in PHP
You can also read the current value of an element, perform some operations with it, and write the changed value back into this element:
<?php
$arr = ['a', 'b', 'c'];
$arr[0] = $arr[0] . '!';
$arr[1] = $arr[1] . '!';
$arr[2] = $arr[2] . '!';
var_dump($arr); // will output ['a!', 'b!', 'c!']
?>
The previous code can be rewritten using the
.= operator:
<?php
$arr = ['a', 'b', 'c'];
$arr[0] .= '!';
$arr[1] .= '!';
$arr[2] .= '!';
var_dump($arr); // will output ['a!', 'b!', 'c!']
?>
Given the following array:
<?php
$arr = ['a' => 1, 'b' => 2, 'c' => 3];
?>
Add the number
3 to each element of the array.
Display the modified array on the screen.
