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--TEST-- Test srand() function : usage variations - different data types as $seed argument --FILE-- <?php /* Prototype : void srand ([ int $seed ] ) * Description: Seed the random number generator. * Source code: ext/standard/rand.c */ echo "*** Testing srand() : usage variations ***\n"; //get an unset variable $unset_var = 10; unset ($unset_var); // heredoc string $heredoc = <<<EOT abc xyz EOT; // get a class class classA { } // get a resource variable $fp = fopen(__FILE__, "r"); $inputs = array( // int data /*1*/ 0, 1, 12345, -2345, 2147483647, // float data /*6*/ 10.5, -10.5, 12.3456789000e10, 12.3456789000E-10, .5, // null data /*11*/ NULL, null, // boolean data /*13*/ true, false, TRUE, FALSE, // empty data /*17*/ "", '', array(), // string data /*20*/ "abcxyz", 'abcxyz', $heredoc, // object data /*23*/ new classA(), // undefined data /*24*/ @$undefined_var, // unset data /*25*/ @$unset_var, // resource variable /*26*/ $fp ); // loop through each element of $inputs to check the behaviour of srand() $iterator = 1; foreach($inputs as $input) { echo "\n-- Iteration $iterator --\n"; var_dump(srand($input)); $iterator++; }; fclose($fp); ?> ===Done=== --EXPECTF-- *** Testing srand() : usage variations *** -- Iteration 1 -- NULL -- Iteration 2 -- NULL -- Iteration 3 -- NULL -- Iteration 4 -- NULL -- Iteration 5 -- NULL -- Iteration 6 -- NULL -- Iteration 7 -- NULL -- Iteration 8 -- NULL -- Iteration 9 -- NULL -- Iteration 10 -- NULL -- Iteration 11 -- NULL -- Iteration 12 -- NULL -- Iteration 13 -- NULL -- Iteration 14 -- NULL -- Iteration 15 -- NULL -- Iteration 16 -- NULL -- Iteration 17 -- Warning: srand() expects parameter 1 to be long, string given in %s on line %d NULL -- Iteration 18 -- Warning: srand() expects parameter 1 to be long, string given in %s on line %d NULL -- Iteration 19 -- Warning: srand() expects parameter 1 to be long, array given in %s on line %d NULL -- Iteration 20 -- Warning: srand() expects parameter 1 to be long, string given in %s on line %d NULL -- Iteration 21 -- Warning: srand() expects parameter 1 to be long, string given in %s on line %d NULL -- Iteration 22 -- Warning: srand() expects parameter 1 to be long, string given in %s on line %d NULL -- Iteration 23 -- Warning: srand() expects parameter 1 to be long, object given in %s on line %d NULL -- Iteration 24 -- NULL -- Iteration 25 -- NULL -- Iteration 26 -- Warning: srand() expects parameter 1 to be long, resource given in %s on line %d NULL ===Done===