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<?php class C implements ArrayAccess { public $data = array( "foo"=>"bar" ); public function offsetExists ( $offset ): bool{ return array_key_exists((string)$offset,$this->data); } public function offsetGet ( $offset ){ return $this->data[$offset]; } public function offsetSet ( $offset , $value ): void { $this->data[$offset]=$value; } public function offsetUnset ( $offset ): void { unset($this->data[$offset]); } } $o=new C(); if(array_key_exists('foo',$o)){ echo "ArrayAccess seems to work"; }else{ echo "ArrayAccess seems broken"; }
based on TcNR4

Shows result from various feature-branches currently under review from the php developers. Contact me to have additional branches featured.

Output for branch master
Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, C given in /in/Woc0R:24 Stack trace: #0 {main} thrown in /in/Woc0R on line 24
Process exited with code 255.
Output for branch master_jit
Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, C given in /in/Woc0R:24 Stack trace: #0 {main} thrown in /in/Woc0R on line 24
Process exited with code 255.

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