<?php
$search_array = array('first' => null, 'second' => 4);
// returns false
isset($search_array['first']);
// returns true
array_key_exists('first', $search_array);
?>
// Here's our fruity array
$fruits = ['apple', 'pear', 'banana'];
// Use it in an `if` statement
if (array_key_exists("banana", $fruits)) {
// Do stuff because `banana` exists
}
// Store it for later use
$exists = array_key_exists("peach", $fruits);
// Return it directly
return array_key_exists("pineapple", $fruits);<?php
$search_array = array('first' => 1, 'second' => 4);
if (array_key_exists('first', $search_array)) {
echo "The 'first' element is in the array";
}
?>$array = array(0 => 100, "cor" => "vermelho");
print_r(array_keys($array));
$array = array("azul", "vermelho", "verde", "azul", "azul");
print_r(array_keys($array, "azul"));
$array = array("cor" => array("azul", "vermelho", "verde"),
"tamanho" => array("pequeno", "medio", "grande"));
print_r(array_keys($array));