note 111774 deleted from language.operators.precedence by salathe
| From: | salathe@php.net | Date: | Wed, 27 Mar 2013 12:28:17 +0000 |
| Subject: | note 111774 deleted from language.operators.precedence by salathe | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-194230@lists.php.net to get a copy of this message | ||
Note Submitter: ivegner at yandex dot ru
----
The priority of object member access operator (->) as compared to array member access operator
([]) could be confusing.
<?php
class SomeClass {
public $property = [
'member' => 'expected',
];
public $indirect = 'totally unexpected';
}
$property = [
'member' => 'indirect',
];
$object = new SomeClass;
print $object->$property['member']; // prints 'totally unexpected'
?>
One would expect the last line to be parsed left-to-right, that is,
<?php
($object->$property)['member']
?>
but it is actually parsed as if it were written
<?php
$object->{$property['member']}
?>
which implies brackets ([]) have a higher priority than an arrow (->).
(tested on PHP 5.4.11)