<?php

​

// The unset method allows you to remove a key from an array in php.

$mascots = [

  'ElePHPant' => 'php',

  'Geeko' => 'openSUSE',

  'Gopher' => 'Go'

];

​

unset($mascots['Gopher']);

​

print_r($mascots);

// Array

// (

//     [ElePHPant] => php

//     [Geeko] => openSUSE

// )

$array = array(

    "name" => "John",

    "age" => 30,

    "city" => "New York",

    "country" => "USA"

);

​

$keysToRemove = array("age", "country");

​

foreach ($keysToRemove as $key) {

    if (array_key_exists($key, $array)) {

        unset($array[$key]);

    }

}

​

print_r($array);

<?php

$array = array(

    'key1' => 'value1',

    'key2' => 'value2',

    'key3' => 'value3'

);

​

$keyToRemove = 'key2';

​

if (array_key_exists($keyToRemove, $array)) {

    unset($array[$keyToRemove]);

    echo "Key '$keyToRemove' has been removed from the array.";

} else {

    echo "Key '$keyToRemove' does not exist in the array.";

}

​

// Output: Key 'key2' has been removed from the array.

?>