PHP Update Array Items

0
5 الف

Update Array Item

To update an existing array item, you can refer to the index number for indexed arrays, and the key name for associative arrays.

ExampleGet your own PHP Server

Change the second array item from "BMW" to "Ford":

$cars = array("Volvo", "BMW", "Toyota");
$cars[1] = "Ford";
Try it Yourself »

Note: The first item has index 0.

To update items from an associative array, use the key name:

Example

Update the year to 2024:

$cars = array("brand" => "Ford", "model" => "Mustang", "year" => 1964);
$cars["year"] = 2024;
Try it Yourself »

Update Array Items in a Foreach Loop

There are different techniques to use when changing item values in a foreach loop.

One way is to insert the & character in the assignment to assign the item value by reference, and thereby making sure that any changes done with the array item inside the loop will be done to the original array:

Example

Change ALL item values to "Ford":

$cars = array("Volvo", "BMW", "Toyota");
foreach ($cars as &$x) {
  $x = "Ford";
}
unset($x);
var_dump($cars);
Try it Yourself »

Note: Remember to add the unset() function after the loop.

Without the unset($x) function, the $x variable will remain as a reference to the last array item.

To demonstrate this, see what happens when we change the value of $x after the foreach loop:

Example

Demonstrate the consequence of forgetting the unset() function:

$cars = array("Volvo", "BMW", "Toyota");
foreach ($cars as &$x) {
  $x = "Ford";
}

$x = "ice cream";

var_dump($cars);
Try it Yourself »
البحث
الأقسام
إقرأ المزيد
أخرى
PHP Associative Arrays
PHP Associative Arrays Associative arrays are arrays that use named keys that you assign to...
بواسطة PHP Tutorial 2024-05-17 08:01:14 0 6 الف
أخرى
PHP Access Arrays
Access Array Item To access an array item, you can refer to the index number for indexed arrays,...
بواسطة PHP Tutorial 2024-05-17 08:02:32 0 6 الف
أخرى
PHP foreach Loop
The foreach loop - Loops through a block of code for each element in an array or each...
بواسطة PHP Tutorial 2024-05-17 07:50:19 0 3 الف
أخرى
PHP Variables Scope
PHP Variables Scope In PHP, variables can be declared anywhere in the script. The scope of a...
بواسطة PHP Tutorial 2024-05-17 07:18:52 0 6 الف
أخرى
PHP Break
The break statement can be used to jump out of different kind of loops. Break in For...
بواسطة PHP Tutorial 2024-05-17 07:50:37 0 3 الف