Delete an element from an array

If you have a numerically indexed array in which all values are unique (or are not unique but you want to delete all instances of a particular value), you can simply use array_diff() to remove a matching element, like this:

$my_array = array_diff($my_array, array('Remover_valor'));

For example:

my_array = array('Andy', 'Bertha', 'Charles', 'Diana');
echo sizeof($my_array) . "\n";
$my_array = array_diff($my_array, array('Charles'));
echo sizeof($my_array);

This shows the following:

4
3

In this example, the element with the value 'Charles' is deleted as it can be verified by the calls sizeof() that report a size of 4 for the initial matrix and 3 after the deletion.

A. If you want to eliminate all occurrences of the value within the array

You can combine the following PHP functions: array_keys() and unset()

In the example I implemented the function remover() :

See DEMO for solutions A and B

<?php
//Caso A. Inicializando valores de ejemplo para probar la función

$arr= array(0 => 'azul', 1 => 'rojo', 2 => 'verde', 3 => 'rojo');

$arr_norojo=remover("rojo",$arr);
print_r($arr_norojo);

$arr_noazul=remover("azul",$arr);
print_r($arr_noazul);

/*
 * Nuestra función usando array_keys() y unset()
 * Devuelve un $arr sin el $valor pasado en parámetro
 */
function remover ($valor,$arr)
{
    foreach (array_keys($arr, $valor) as $key) 
    {
        unset($arr[$key]);
    }
    echo "Removiendo: ".$valor."\n\n";
    return $arr;
}

Result:

Removiendo: rojo
Array
(
    [0] => azul
    [2] => verde
)


Removiendo: azul
Array
(
    [1] => rojo
    [2] => verde
    [3] => rojo
)

B. If you want to delete only one occurrence:

You can combine unset() quoted above, with array_search() .

Example:

<?php
//Caso B. Inicializando valores de ejemplo para probar la función

$arr= array(0 => 'azul', 1 => 'rojo', 2 => 'verde', 3 => 'rojo');
$arr_norojo=remover_simple("rojo",$arr);
print_r($arr_norojo);

$arr_noazul=remover_simple("azul",$arr);
print_r($arr_noazul);


/*
 * Nuestra función simple usando array_search() y unset()
 * Devuelve un $arr sin la primera ocurrencia del $valor pasado en parámetro
 */

function remover_simple ($valor,$arr)
{
    if (($key = array_search($valor, $arr)) !== false) 
    {
    unset($arr[$key]);
    }
    echo "Removiendo sólo una vez: ".$valor."\n\n";
    return $arr;
}

Result:

Removiendo sólo una vez: rojo
Array
(
    [0] => azul
    [2] => verde
    [3] => rojo
)


Removiendo sólo una vez: azul    
Array
(
    [1] => rojo
    [2] => verde
    [3] => rojo
)

A simple way is using the "unset" function, I suppose you are working with "JSON" format since it is very used nowadays:

The syntax:

unset($nombre_del_array['clave_del_elemento']);