Php isset tableau

<?php

$a = array ('test' => 1, 'hello' => NULL, 'pie' => array('a' => 'apple'));

var_dump(isset($a['test']));            // TRUE
var_dump(isset($a['foo']));             // FALSE
var_dump(isset($a['hello']));           // FALSE

// The key 'hello' equals NULL so is considered unset
// If you want to check for NULL key values then try: 
var_dump(array_key_exists('hello', $a)); // TRUE

// Checking deeper array values
var_dump(isset($a['pie']['a']));        // TRUE
var_dump(isset($a['pie']['b']));        // FALSE
var_dump(isset($a['cake']['a']['b']));  // FALSE

?>

Source: php.net

Similar codes

0 vote218 views1 answer
Laravel create new file if not exists
PHP Laravel
0 vote172 views1 answer
Eager load relationships on an existing model in route laravel
PHP
0 vote165 views1 answer
Return redirect to another url in controller laravel
PHP
0 vote166 views1 answer
Wordpress add to cart redirect php
PHP
2 votes176 views2 answers
Eloquent with select
PHP
0 vote232 views1 answer
Laravel map the output of the api
PHP
0 vote178 views2 answers
Laravel required_if fileld has value
PHP
2 votes211 views3 answers
Laravel get auth user in constructor
PHP
8 votes294 views5 answers
Wherebetween laravel
PHP Laravel
3 votes178 views2 answers
Php mysql search database and display results
PHP