1, 'two' => 2); // get a resource variable $fp = fopen(__FILE__, "r"); // unexpected values to be passed to <<>> argument $inputs = array( // int data /*1*/ 0, 1, 12345, -2345, // float data /*5*/ 10.5, -10.5, 12.3456789000e10, 12.3456789000E-10, .5, // null data /*10*/ NULL, null, // boolean data /*12*/ true, false, TRUE, FALSE, // empty data /*16*/ "", '', // string data /*18*/ "string", 'string', $heredoc, // array data /*21*/ array(), $index_array, $assoc_array, array('foo', $index_array, $assoc_array), // object data /*25*/ new classA(), // undefined data /*26*/ @$undefined_var, // unset data /*27*/ @$unset_var, // resource variable /*28*/ $fp ); // loop through each element of $inputs to check the behavior of <<>> $iterator = 1; foreach($inputs as $input) { echo "\n-- Iteration $iterator --\n"; var_dump( '<<>>' ); $iterator++; }; fclose($fp); ?>