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--TEST-- Test strval() function : usage variations - Pass different data types as strval --FILE-- <?php /* Prototype : string strval ( mixed $var ) * Description: Get the string value of a variable. * Source code: ext/standard/string.c */ echo "*** Testing strval() : usage variations ***\n"; error_reporting(E_ALL ^ E_NOTICE); //get an unset variable $unset_var = 10; unset ($unset_var); //getting the resource $file_handle = fopen(__FILE__, "r"); class MyClass { function __toString() { return "MyClass"; } } //array of values to iterate over $values = array( //Decimal values /*1*/ 0, 1, 12345, -12345, //Octal values /*5*/ 02, 010, 030071, -030071, //Hexadecimal values /*9*/ 0x0, 0x1, 0xABCD, -0xABCD, // float data /*13*/ 100.5, -100.5, 100.1234567e10, 100.7654321E-10, .5, // array data /*18*/ array(), array('color' => 'red', 'item' => 'pen'), // null data /*20*/ NULL, null, // boolean data /*22*/ true, false, TRUE, FALSE, // empty data /*26*/ "", '', // object data /*28*/ new MyClass(), // resource /*29*/ $file_handle, // undefined data /*30*/ @$undefined_var, // unset data /*31*/ @$unset_var, ); // loop through each element of the array for strval $iterator = 1; foreach($values as $value) { echo "\n-- Iteration $iterator --\n"; var_dump( strval($value) ); $iterator++; }; ?> ===DONE=== --EXPECTF-- *** Testing strval() : usage variations *** -- Iteration 1 -- string(1) "0" -- Iteration 2 -- string(1) "1" -- Iteration 3 -- string(5) "12345" -- Iteration 4 -- string(6) "-12345" -- Iteration 5 -- string(1) "2" -- Iteration 6 -- string(1) "8" -- Iteration 7 -- string(5) "12345" -- Iteration 8 -- string(6) "-12345" -- Iteration 9 -- string(1) "0" -- Iteration 10 -- string(1) "1" -- Iteration 11 -- string(5) "43981" -- Iteration 12 -- string(6) "-43981" -- Iteration 13 -- string(5) "100.5" -- Iteration 14 -- string(6) "-100.5" -- Iteration 15 -- string(13) "1001234567000" -- Iteration 16 -- string(14) "1.007654321E-8" -- Iteration 17 -- string(3) "0.5" -- Iteration 18 -- string(5) "Array" -- Iteration 19 -- string(5) "Array" -- Iteration 20 -- string(0) "" -- Iteration 21 -- string(0) "" -- Iteration 22 -- string(1) "1" -- Iteration 23 -- string(0) "" -- Iteration 24 -- string(1) "1" -- Iteration 25 -- string(0) "" -- Iteration 26 -- string(0) "" -- Iteration 27 -- string(0) "" -- Iteration 28 -- string(7) "MyClass" -- Iteration 29 -- string(%d) "Resource id #%d" -- Iteration 30 -- string(0) "" -- Iteration 31 -- string(0) "" ===DONE===