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--TEST-- Test each() function : usage variations - keys of different data types --FILE-- <?php /* Prototype : array each(array $arr) * Description: Return the currently pointed key..value pair in the passed array, * and advance the pointer to the next element * Source code: Zend/zend_builtin_functions.c */ /* * Pass each() arrays where the keys are different data types to test behaviour */ echo "*** Testing each() : usage variations ***\n"; //get an unset variable $unset_var = 10; unset ($unset_var); // heredoc string $heredoc = <<<EOT hello world EOT; // unexpected values to be passed as $arr $inputs = array( // int data /*1*/ 'int' => array( 0 => 'zero', 1 => 'one', 12345 => 'positive', -2345 => 'negative', ), // float data /*2*/ 'float' => array( 10.5 => 'positive', -10.5 => 'negative', .5 => 'half', ), /*3*/ 'extreme floats' => array( 12.3456789000e6 => 'large', 12.3456789000E-10 => 'small', ), // null data /*4*/ 'null uppercase' => array( NULL => 'null 1', ), /*5*/ 'null lowercase' => array( null => 'null 2', ), // boolean data /*6*/ 'bool lowercase' => array( true => 'lowert', false => 'lowerf', ), /*7*/ 'bool uppercase' => array( TRUE => 'uppert', FALSE => 'upperf', ), // empty data /*8*/ 'empty double quotes' => array( "" => 'emptyd', ), /*9*/ 'empty single quotes' => array( '' => 'emptys', ), // string data /*10*/ 'string' => array( "stringd" => 'stringd', 'strings' => 'strings', $heredoc => 'stringh', ), // undefined data /*11*/ 'undefined' => array( @$undefined_var => 'undefined', ), // unset data /*12*/ 'unset' => array( @$unset_var => 'unset', ), ); // loop through each element of $inputs to check the behavior of each() $iterator = 1; foreach($inputs as $key => $input) { echo "\n-- Iteration $iterator: $key data --\n"; var_dump( each($input) ); $iterator++; }; echo "Done"; ?> --EXPECTF-- *** Testing each() : usage variations *** -- Iteration 1: int data -- array(4) { [1]=> string(4) "zero" ["value"]=> string(4) "zero" [0]=> int(0) ["key"]=> int(0) } -- Iteration 2: float data -- array(4) { [1]=> string(8) "positive" ["value"]=> string(8) "positive" [0]=> int(10) ["key"]=> int(10) } -- Iteration 3: extreme floats data -- array(4) { [1]=> string(5) "large" ["value"]=> string(5) "large" [0]=> int(12345678) ["key"]=> int(12345678) } -- Iteration 4: null uppercase data -- array(4) { [1]=> string(6) "null 1" ["value"]=> string(6) "null 1" [0]=> string(0) "" ["key"]=> string(0) "" } -- Iteration 5: null lowercase data -- array(4) { [1]=> string(6) "null 2" ["value"]=> string(6) "null 2" [0]=> string(0) "" ["key"]=> string(0) "" } -- Iteration 6: bool lowercase data -- array(4) { [1]=> string(6) "lowert" ["value"]=> string(6) "lowert" [0]=> int(1) ["key"]=> int(1) } -- Iteration 7: bool uppercase data -- array(4) { [1]=> string(6) "uppert" ["value"]=> string(6) "uppert" [0]=> int(1) ["key"]=> int(1) } -- Iteration 8: empty double quotes data -- array(4) { [1]=> string(6) "emptyd" ["value"]=> string(6) "emptyd" [0]=> string(0) "" ["key"]=> string(0) "" } -- Iteration 9: empty single quotes data -- array(4) { [1]=> string(6) "emptys" ["value"]=> string(6) "emptys" [0]=> string(0) "" ["key"]=> string(0) "" } -- Iteration 10: string data -- array(4) { [1]=> string(7) "stringd" ["value"]=> string(7) "stringd" [0]=> string(7) "stringd" ["key"]=> string(7) "stringd" } -- Iteration 11: undefined data -- array(4) { [1]=> string(9) "undefined" ["value"]=> string(9) "undefined" [0]=> string(0) "" ["key"]=> string(0) "" } -- Iteration 12: unset data -- array(4) { [1]=> string(5) "unset" ["value"]=> string(5) "unset" [0]=> string(0) "" ["key"]=> string(0) "" } Done