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--TEST-- Test array_merge_recursive() function : usage variations - array with duplicate keys --FILE-- <?php /* Prototype : array array_merge_recursive(array $arr1[, array $...]) * Description: Recursively merges elements from passed arrays into one array * Source code: ext/standard/array.c */ /* * Testing the functionality of array_merge_recursive() by passing * array having duplicate keys. */ echo "*** Testing array_merge_recursive() : array with duplicate keys for \$arr1 argument ***\n"; /* initialize the array having duplicate keys */ // array with numeric keys $arr1_numeric_key = array( 1 => "one", 2 => "two", 2 => array(1, 2), 3 => "three", 1 => array("duplicate", 'strings')); // array with string keys $arr1_string_key = array("str1" => "hello", "str2" => 111, "str1" => "world", "str2" => 111.111); // initialize the second argument $arr2 = array("one", "str1" => "two", array("one", "two")); echo "-- With default argument --\n"; var_dump( array_merge_recursive($arr1_numeric_key) ); var_dump( array_merge_recursive($arr1_string_key) ); echo "-- With more arguments --\n"; var_dump( array_merge_recursive($arr1_numeric_key, $arr2) ); var_dump( array_merge_recursive($arr1_string_key, $arr2) ); echo "Done"; ?> --EXPECTF-- *** Testing array_merge_recursive() : array with duplicate keys for $arr1 argument *** -- With default argument -- array(3) { [0]=> array(2) { [0]=> string(9) "duplicate" [1]=> string(7) "strings" } [1]=> array(2) { [0]=> int(1) [1]=> int(2) } [2]=> string(5) "three" } array(2) { ["str1"]=> string(5) "world" ["str2"]=> float(111.111) } -- With more arguments -- array(6) { [0]=> array(2) { [0]=> string(9) "duplicate" [1]=> string(7) "strings" } [1]=> array(2) { [0]=> int(1) [1]=> int(2) } [2]=> string(5) "three" [3]=> string(3) "one" ["str1"]=> string(3) "two" [4]=> array(2) { [0]=> string(3) "one" [1]=> string(3) "two" } } array(4) { ["str1"]=> array(2) { [0]=> string(5) "world" [1]=> string(3) "two" } ["str2"]=> float(111.111) [0]=> string(3) "one" [1]=> array(2) { [0]=> string(3) "one" [1]=> string(3) "two" } } Done