PHP

HOW TO MODIFY ARRAYS

Arrays, just like normal variables, can be changed at any time in your script. For example, you can add or remove elements, rearrange the order of elements or change individual values.

Example: Add Element

Suppose you have an array:

$colors=array('blue', 'red', 'green');

To add element:

$colors[ ]="black";

Now the $colors array will be:

$colors=array('blue', 'red', 'green', 'black');

Example: Remove Element

Suppose you have an array:

$colors=array('blue', 'red', 'green');

The above is equivalent to:

$colors[0]="blue";
$colors[1]="red";
$colors[2]="green";

Say, you want to remove red:

$unset($colors[1]);

Now the $colors array will be:

$colors=array('blue', 'green');

Example: Change Value

Suppose you have an array:

$colors=array('blue', 'red', 'green');

The above is equivalent to:

$colors[0]="blue";
$colors[1]="red";
$colors[2]="green";

Say, you want to change green to yellow, just do:

$colors[2]="yellow";

Now the $colors array will be:

$colors=array('blue', 'red', 'yellow');

Example: Rearrange

Suppose you have an array:

$colors=array('blue', 'red', 'green');

The above is equivalent to:

$colors[0]="blue";
$colors[1]="red";
$colors[2]="green";

Say, you want to swap blue and green around, just do:

$colors[2]="blue";
$colors[0]="green";

Now the $colors array will be:

$colors=array('green', 'red', 'blue');

See also:

What Are Arrays?

How To View Arrays

How To Create Arrays

Array arsort() Function

Array asort() Function

Array rsort() Function

Array sort() Function

Array ksort() Function

Array krsort() Function

Array Echo

Array list() Function

Manual Array Iteration

Array count() & sizeof() Function