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+--TEST--
+Test array_diff() function : usage variations - unexpected values for 'arr1' argument
+--FILE--
+<?php
+/* Prototype : array array_diff(array $arr1, array $arr2 [, array ...])
+ * Description: Returns the entries of $arr1 that have values which are not
+ * present in any of the others arguments.
+ * Source code: ext/standard/array.c
+ */
+
+/*
+ * Test array_diff by passing non array values in place of $arr1
+ */
+
+echo "*** Testing array_diff() : usage variations ***\n";
+
+$array = array(1, 2, 3);
+
+//get an unset variable
+$unset_var = 10;
+unset ($unset_var);
+
+// get a class
+class classA
+{
+ public function __toString() {
+ return "Class A object";
+ }
+}
+
+// heredoc string
+$heredoc = <<<EOT
+hello world
+EOT;
+
+// get a resource variable
+$fp = fopen(__FILE__, "r");
+
+// unexpected values to be passed to $input argument
+$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',
+ $heredoc,
+
+ // binary data
+/*21*/ b"binary",
+ (binary)"binary",
+
+ // object data
+/*23*/ new classA(),
+
+ // undefined data
+/*24*/ @$undefined_var,
+
+ // unset data
+/*25*/ @$unset_var,
+
+ // resource variable
+/*26*/ $fp
+);
+
+// loop through each element of $inputs to check the behavior of array_diff
+$iterator = 1;
+foreach($inputs as $input) {
+ echo "\n-- Iteration $iterator --";
+ var_dump( array_diff($input, $array));
+ $iterator++;
+};
+
+fclose($fp);
+echo "Done";
+?>
+--EXPECTF--
+*** Testing array_diff() : usage variations ***
+
+-- Iteration 1 --
+Warning: array_diff(): Argument #1 is not an array in %s on line %d
+NULL
+
+-- Iteration 2 --
+Warning: array_diff(): Argument #1 is not an array in %s on line %d
+NULL
+
+-- Iteration 3 --
+Warning: array_diff(): Argument #1 is not an array in %s on line %d
+NULL
+
+-- Iteration 4 --
+Warning: array_diff(): Argument #1 is not an array in %s on line %d
+NULL
+
+-- Iteration 5 --
+Warning: array_diff(): Argument #1 is not an array in %s on line %d
+NULL
+
+-- Iteration 6 --
+Warning: array_diff(): Argument #1 is not an array in %s on line %d
+NULL
+
+-- Iteration 7 --
+Warning: array_diff(): Argument #1 is not an array in %s on line %d
+NULL
+
+-- Iteration 8 --
+Warning: array_diff(): Argument #1 is not an array in %s on line %d
+NULL
+
+-- Iteration 9 --
+Warning: array_diff(): Argument #1 is not an array in %s on line %d
+NULL
+
+-- Iteration 10 --
+Warning: array_diff(): Argument #1 is not an array in %s on line %d
+NULL
+
+-- Iteration 11 --
+Warning: array_diff(): Argument #1 is not an array in %s on line %d
+NULL
+
+-- Iteration 12 --
+Warning: array_diff(): Argument #1 is not an array in %s on line %d
+NULL
+
+-- Iteration 13 --
+Warning: array_diff(): Argument #1 is not an array in %s on line %d
+NULL
+
+-- Iteration 14 --
+Warning: array_diff(): Argument #1 is not an array in %s on line %d
+NULL
+
+-- Iteration 15 --
+Warning: array_diff(): Argument #1 is not an array in %s on line %d
+NULL
+
+-- Iteration 16 --
+Warning: array_diff(): Argument #1 is not an array in %s on line %d
+NULL
+
+-- Iteration 17 --
+Warning: array_diff(): Argument #1 is not an array in %s on line %d
+NULL
+
+-- Iteration 18 --
+Warning: array_diff(): Argument #1 is not an array in %s on line %d
+NULL
+
+-- Iteration 19 --
+Warning: array_diff(): Argument #1 is not an array in %s on line %d
+NULL
+
+-- Iteration 20 --
+Warning: array_diff(): Argument #1 is not an array in %s on line %d
+NULL
+
+-- Iteration 21 --
+Warning: array_diff(): Argument #1 is not an array in %s on line %d
+NULL
+
+-- Iteration 22 --
+Warning: array_diff(): Argument #1 is not an array in %s on line %d
+NULL
+
+-- Iteration 23 --
+Warning: array_diff(): Argument #1 is not an array in %s on line %d
+NULL
+
+-- Iteration 24 --
+Warning: array_diff(): Argument #1 is not an array in %s on line %d
+NULL
+
+-- Iteration 25 --
+Warning: array_diff(): Argument #1 is not an array in %s on line %d
+NULL
+
+-- Iteration 26 --
+Warning: array_diff(): Argument #1 is not an array in %s on line %d
+NULL
+Done \ No newline at end of file