array_has

The array_has() function walks through the given array or ArrayAccess object to check if the specified element or offset exists. You can use dot notation to drill down to the specific key/offset depth that you need to check.

Syntax:

mixed array_add( 
     ArrayAccess|array $subjectArrayOrObject, 
     string $dotNotationKeys
);

Array examples:

$user = array(
	'user_id'   => 504,
	'name'      => 'Bob Jones',
	'social'    => array(
		'twitter' => '@bobjones',
	),
);

if ( array_has( $user, 'social.website' ) ) {}
// returns false

if ( array_has( $user, 'social.true' ) ) {}
// returns true

if ( array_has( $user, 'email' ) ) {}
// returns false

if ( array_has( $user, 'name' ) ) {}
// returns true

ArrayAccess examples, where User implements ArrayAccess in its class blueprint:

$user = new User ( array(
	'user_id'   => 504,
	'name'      => 'Bob Jones',
	'social'    => array(
		'twitter' => '@bobjones',
	),
) );

if ( array_has( $user, 'social.website' ) ) {}
// returns false

if ( array_has( $user, 'social.true' ) ) {}
// returns true

if ( array_has( $user, 'email' ) ) {}
// returns false

if ( array_has( $user, 'name' ) ) {}
// returns true

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