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<?php class Bar { // protected $compat_fields = array(); public function __construct() { } } class Foo extends Bar { public function __construct() { parent::__construct(); if ( $this->compat_fields && is_array( $this->compat_fields ) ) { array_push( $this->compat_fields, 'all_items' ); } $this->all_items = array(); } } $foo = new Foo(); var_dump( $foo->all_items );
Output for git.master_jit, git.master, rfc.property-hooks
Warning: Undefined property: Foo::$compat_fields in /in/8djK8 on line 15 Deprecated: Creation of dynamic property Foo::$all_items is deprecated in /in/8djK8 on line 19 array(0) { }

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