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--TEST-- ZE2 An interface is inherited --SKIPIF-- <?php if (version_compare(zend_version(), '2.0.0-dev', '<')) die('skip ZendEngine 2 needed'); ?> --FILE-- <?php interface if_a { function f_a(); } interface if_b extends if_a { function f_b(); } class base { function _is_a($sub) { echo 'is_a('.get_class($this).', '.$sub.') = '.(($this instanceof $sub) ? 'yes' : 'no')."\n"; } function test() { echo $this->_is_a('base'); echo $this->_is_a('derived_a'); echo $this->_is_a('derived_b'); echo $this->_is_a('derived_c'); echo $this->_is_a('derived_d'); echo $this->_is_a('if_a'); echo $this->_is_a('if_b'); echo "\n"; } } class derived_a extends base implements if_a { function f_a() {} } class derived_b extends base implements if_a, if_b { function f_a() {} function f_b() {} } class derived_c extends derived_a implements if_b { function f_b() {} } class derived_d extends derived_c { } $t = new base(); $t->test(); $t = new derived_a(); $t->test(); $t = new derived_b(); $t->test(); $t = new derived_c(); $t->test(); $t = new derived_d(); $t->test(); ?> --EXPECTF-- is_a(base, base) = yes is_a(base, derived_a) = no is_a(base, derived_b) = no is_a(base, derived_c) = no is_a(base, derived_d) = no is_a(base, if_a) = no is_a(base, if_b) = no is_a(derived_a, base) = yes is_a(derived_a, derived_a) = yes is_a(derived_a, derived_b) = no is_a(derived_a, derived_c) = no is_a(derived_a, derived_d) = no is_a(derived_a, if_a) = yes is_a(derived_a, if_b) = no is_a(derived_b, base) = yes is_a(derived_b, derived_a) = no is_a(derived_b, derived_b) = yes is_a(derived_b, derived_c) = no is_a(derived_b, derived_d) = no is_a(derived_b, if_a) = yes is_a(derived_b, if_b) = yes is_a(derived_c, base) = yes is_a(derived_c, derived_a) = yes is_a(derived_c, derived_b) = no is_a(derived_c, derived_c) = yes is_a(derived_c, derived_d) = no is_a(derived_c, if_a) = yes is_a(derived_c, if_b) = yes is_a(derived_d, base) = yes is_a(derived_d, derived_a) = yes is_a(derived_d, derived_b) = no is_a(derived_d, derived_c) = yes is_a(derived_d, derived_d) = yes is_a(derived_d, if_a) = yes is_a(derived_d, if_b) = yes