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--TEST-- Test strrev() function : usage variations - unexpected inputs --FILE-- <?php /* Prototype : string strrev(string $str); * Description: Reverse a string * Source code: ext/standard/string.c */ /* Testing strrev() function with unexpected inputs for 'str' */ echo "*** Testing strrev() : unexpected inputs for 'str' ***\n"; //class declaration class sample { public function __toString(){ return "object"; } } //get the resource $resource = fopen(__FILE__, "r"); //get an unset variable $unset_var = 10; unset ($unset_var); //array of values to iterate over $values = array( // int data 0, 1, 12345, -2345, // float data 10.5, -10.5, 10.5e10, 10.6E-10, .5, // array data array(), array(0), array(1), array(1, 2), array('color' => 'red', 'item' => 'pen'), // null data NULL, null, // boolean data true, false, TRUE, FALSE, // empty data "", '', // object data new sample(), // resource $resource, // undefined data @$undefined_var, // unset data @$unset_var ); // loop through each element of the array for str $count = 1; foreach($values as $value) { echo "\n-- Iterator $count --\n"; var_dump( strrev($value) ); $count++; }; fclose($resource); //closing the file handle echo "*** Done ***"; ?> --EXPECTF-- *** Testing strrev() : unexpected inputs for 'str' *** -- Iterator 1 -- string(1) "0" -- Iterator 2 -- string(1) "1" -- Iterator 3 -- string(5) "54321" -- Iterator 4 -- string(5) "5432-" -- Iterator 5 -- string(4) "5.01" -- Iterator 6 -- string(5) "5.01-" -- Iterator 7 -- string(12) "000000000501" -- Iterator 8 -- string(7) "9-E60.1" -- Iterator 9 -- string(3) "5.0" -- Iterator 10 -- Warning: strrev() expects parameter 1 to be string, array given in %s on line %d NULL -- Iterator 11 -- Warning: strrev() expects parameter 1 to be string, array given in %s on line %d NULL -- Iterator 12 -- Warning: strrev() expects parameter 1 to be string, array given in %s on line %d NULL -- Iterator 13 -- Warning: strrev() expects parameter 1 to be string, array given in %s on line %d NULL -- Iterator 14 -- Warning: strrev() expects parameter 1 to be string, array given in %s on line %d NULL -- Iterator 15 -- string(0) "" -- Iterator 16 -- string(0) "" -- Iterator 17 -- string(1) "1" -- Iterator 18 -- string(0) "" -- Iterator 19 -- string(1) "1" -- Iterator 20 -- string(0) "" -- Iterator 21 -- string(0) "" -- Iterator 22 -- string(0) "" -- Iterator 23 -- string(6) "tcejbo" -- Iterator 24 -- Warning: strrev() expects parameter 1 to be string, resource given in %s on line %d NULL -- Iterator 25 -- string(0) "" -- Iterator 26 -- string(0) "" *** Done ***