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297 lines
4.8 KiB
PHP
297 lines
4.8 KiB
PHP
--TEST--
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Test is_null() function
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--FILE--
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<?php
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/* Prototype: bool is_null ( mixed $var );
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* Description: Finds whether the given variable is NULL
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*/
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echo "*** Testing is_null() with valid null values ***\n";
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// different valid null vlaues
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$unset_array = array();
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$unset_int = 10;
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$unset_float = 10.5;
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$unset_bool = true;
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$unset_object = new stdclass;
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$unset_resource = fopen(__FILE__, "r");
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// unset them to make it null.
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unset ($unset_array, $unset_int, $unset_float, $unset_bool, $unset_object, $unset_resource);
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$null_var1 = NULL;
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$null_var2 = null;
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$valid_nulls = array(
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NULL,
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null,
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@$null_var1,
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@$null_var2,
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@$unset_array,
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@$unset_int,
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@$unset_float,
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@$unset_bool,
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@$unset_object,
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@$unset_resource,
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@$undefined_var,
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);
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/* loop to check that is_null() recognizes different
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null values, expected output: bool(true) */
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$loop_counter = 1;
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foreach ($valid_nulls as $null_val ) {
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echo "-- Iteration $loop_counter --\n"; $loop_counter++;
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var_dump( is_null($null_val) );
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}
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echo "\n*** Testing is_bool() on non null values ***\n";
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// get a resource type variable
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$fp = fopen (__FILE__, "r");
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$dfp = opendir ( dirname(__FILE__) );
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// other types in a array
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$not_null_types = array (
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/* integers */
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0,
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1,
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-1,
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-0,
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543915,
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-5322,
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0x0,
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0x1,
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0x55F,
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-0xCCF,
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0123,
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-0654,
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00,
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01,
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/* strings */
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"",
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'',
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"0",
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'0',
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"1",
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'1',
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'string',
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"string",
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"true",
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"false",
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"FALSE",
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"TRUE",
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'true',
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'false',
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'FALSE',
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'TRUE',
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"NULL",
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"null",
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/* floats */
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0.0,
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1.0,
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-1.0,
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10.0000000000000000005,
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.5e6,
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-.5E7,
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.5E+8,
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-.5e+90,
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1e5,
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-1e5,
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1E5,
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-1E7,
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/* objects */
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new stdclass,
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/* resources */
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$fp,
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$dfp,
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/* arrays */
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array(),
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array(0),
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array(1),
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array(NULL),
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array(null),
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array("string"),
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array(true),
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array(TRUE),
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array(false),
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array(FALSE),
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array(1,2,3,4),
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array(1 => "One", "two" => 2),
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);
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/* loop through the $not_null_types to see working of
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is_null() on non null types, expected output: bool(false) */
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$loop_counter = 1;
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foreach ($not_null_types as $type ) {
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echo "-- Iteration $loop_counter --\n"; $loop_counter++;
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var_dump( is_null($type) );
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}
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echo "\n*** Testing error conditions ***\n";
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//Zero argument
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var_dump( is_null() );
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//arguments more than expected
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var_dump( is_null(NULL, null) );
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echo "Done\n";
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// close the resources used
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fclose($fp);
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closedir($dfp);
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?>
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--EXPECTF--
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*** Testing is_null() with valid null values ***
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-- Iteration 1 --
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bool(true)
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-- Iteration 2 --
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bool(true)
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-- Iteration 3 --
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bool(true)
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-- Iteration 4 --
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bool(true)
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-- Iteration 5 --
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bool(true)
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-- Iteration 6 --
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bool(true)
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-- Iteration 7 --
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bool(true)
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-- Iteration 8 --
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bool(true)
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-- Iteration 9 --
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bool(true)
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-- Iteration 10 --
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bool(true)
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-- Iteration 11 --
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bool(true)
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*** Testing is_bool() on non null values ***
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-- Iteration 1 --
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bool(false)
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-- Iteration 2 --
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bool(false)
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-- Iteration 3 --
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bool(false)
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-- Iteration 4 --
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bool(false)
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-- Iteration 5 --
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bool(false)
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-- Iteration 6 --
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bool(false)
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-- Iteration 7 --
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bool(false)
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-- Iteration 8 --
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bool(false)
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-- Iteration 9 --
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bool(false)
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-- Iteration 10 --
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bool(false)
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-- Iteration 11 --
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bool(false)
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-- Iteration 12 --
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bool(false)
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-- Iteration 13 --
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bool(false)
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-- Iteration 14 --
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bool(false)
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-- Iteration 15 --
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bool(false)
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-- Iteration 16 --
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bool(false)
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-- Iteration 17 --
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bool(false)
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-- Iteration 18 --
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bool(false)
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-- Iteration 19 --
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bool(false)
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-- Iteration 20 --
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bool(false)
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-- Iteration 21 --
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bool(false)
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-- Iteration 22 --
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bool(false)
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-- Iteration 23 --
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bool(false)
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-- Iteration 24 --
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bool(false)
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-- Iteration 25 --
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bool(false)
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-- Iteration 26 --
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bool(false)
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-- Iteration 27 --
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bool(false)
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-- Iteration 28 --
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bool(false)
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-- Iteration 29 --
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bool(false)
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-- Iteration 30 --
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bool(false)
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-- Iteration 31 --
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bool(false)
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-- Iteration 32 --
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bool(false)
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-- Iteration 33 --
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bool(false)
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-- Iteration 34 --
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bool(false)
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-- Iteration 35 --
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bool(false)
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-- Iteration 36 --
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bool(false)
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-- Iteration 37 --
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bool(false)
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-- Iteration 38 --
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bool(false)
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-- Iteration 39 --
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bool(false)
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-- Iteration 40 --
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bool(false)
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-- Iteration 41 --
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bool(false)
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-- Iteration 42 --
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bool(false)
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-- Iteration 43 --
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bool(false)
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-- Iteration 44 --
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bool(false)
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-- Iteration 45 --
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bool(false)
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-- Iteration 46 --
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bool(false)
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-- Iteration 47 --
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bool(false)
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-- Iteration 48 --
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bool(false)
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-- Iteration 49 --
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bool(false)
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-- Iteration 50 --
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bool(false)
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-- Iteration 51 --
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bool(false)
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-- Iteration 52 --
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bool(false)
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-- Iteration 53 --
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bool(false)
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-- Iteration 54 --
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bool(false)
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-- Iteration 55 --
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bool(false)
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-- Iteration 56 --
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bool(false)
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-- Iteration 57 --
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bool(false)
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-- Iteration 58 --
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bool(false)
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-- Iteration 59 --
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bool(false)
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*** Testing error conditions ***
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Warning: is_null() expects exactly 1 parameter, 0 given in %s on line %d
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bool(false)
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Warning: is_null() expects exactly 1 parameter, 2 given in %s on line %d
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bool(false)
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Done
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