rfc:typehint

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rfc:typehint [2008/04/08 01:33] – BC Break section feliperfc:typehint [2017/09/22 13:28] (current) – external edit 127.0.0.1
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   * Date: 2008-04-07   * Date: 2008-04-07
   * Author: Felipe Pena <felipensp@gmail.com>   * Author: Felipe Pena <felipensp@gmail.com>
-  * Status: Under Discussion+  * Status: [[http://news.php.net/php.internals/37049|Under Discussion]] 
 + 
 + 
 +====== Details of implementation ====== 
 +**Parameter type hint:** 
 +  - The behavior when the default parameter value is ''NULL'' was kept. 
 +**Both:** 
 +  - Binary and unicode string are specified by ''string''. 
 + 
 +===== Return value type hint ===== 
 + 
 +==== BC Break ==== 
 +No BC break using the "(type)" syntax. (Inspirated by Objective-C) 
 + 
 + 
 +==== Examples ==== 
 + 
 +=== Using inside namespaces === 
 +<code php> 
 +namespace foo; 
 + 
 +class test { } 
 + 
 +class bar { 
 + static public function (foo::test) testing($instance) { 
 + return $instance; 
 + } 
 +} 
 + 
 +bar::testing(new test); 
 +bar::testing(new stdClass); // Catchable fatal error: The returned value should be instance of foo::test 
 +</code> 
 + 
 +=== Using inheritance === 
 +<code php> 
 +interface ITest { } 
 +class bar implements ITest { } 
 +class foo extends bar { } 
 + 
 +function (Itest) testing($instance) { 
 + return $instance;  
 +} 
 + 
 +testing(new bar); 
 +testing(new foo); 
 +testing(new stdClass); // Catchable fatal error: The returned value must implement interface Itest 
 +</code> 
 + 
 +=== Interfaces === 
 + 
 +<code php> 
 +interface ITest { 
 + public function (int) foo();  
 +} 
 + 
 +class foo implements ITest { 
 + public function (int) foo() { 
 + return 'a'; 
 + }  
 +} 
 + 
 +$test = new foo; 
 +$test->foo(); // Catchable fatal error: The returned value must be of the type integer 
 +</code> 
 + 
 +<code php> 
 +interface ITest { 
 + public function (int) foo();  
 +} 
 + 
 +class foo implements ITest { 
 + public function foo() { 
 + return 1; 
 + }  
 +} 
 + 
 +$test = new foo; 
 +$test->foo(); // Fatal error: Declaration of foo::foo() must be compatible with that of ITest::foo() 
 +</code> 
 + 
 +=== Trying use with magic methods === 
 +<code php> 
 +class test { 
 + // Fatal error: Return type hint can't be used with magic methods 
 + public function (int) __toString() { 
 + } 
 +} 
 +</code> 
 + 
 +=== PHP types === 
 +<code php> 
 +function (int) test($value) { 
 + return $value; 
 +} 
 + 
 +test('1337'); // Catchable fatal error: The returned value must be of the type integer 
 +</code> 
 + 
 + 
 +===== Parameter type hint ===== 
 + 
 +==== BC Break ====
  
-===== BC Break ===== 
 == New tokens (new keywords) == == New tokens (new keywords) ==
   - T_INTEGER (Keywords: int, integer)   - T_INTEGER (Keywords: int, integer)
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   - T_STR (Keyword: string)   - T_STR (Keyword: string)
  
 +==== Other changes ====
 +  - Removed ZEND_ARG_ARRAY_INFO()
 +  - Added ZEND_ARG_PHP_TYPE_INFO()
 +<code diff u>
 +-#define ZEND_ARG_ARRAY_INFO(pass_by_ref, name, allow_null) { {#name}, sizeof(#name)-1, {NULL}, 0, 1, allow_null, pass_by_ref, 0, 0 },
 ++#define ZEND_ARG_PHP_TYPE_INFO(pass_by_ref, name, php_type, allow_null) { {#name}, sizeof(#name)-1, {NULL}, 0, php_type, allow_null, pass_by_ref, 0, 0 },
 +</code>
 +  - **Reflection**: ReflectionParameter class:
 +    - Added:
 +      - isInt()
 +      - isDouble()
 +      - isBool()
 +      - isString()
 +      - isObject()
 +      - isResource()
 +
 +
 +
 +==== Examples ====
 +
 +=== With default parameter value ===
 +<code php>
 +function test(integer $value = '1') {
 +}
 +// Fatal error: Default value for parameters with integer type hint can only be the exact type or NULL
 +</code>
  
-===== Parameter type hint - Examples ===== 
 === integer / int === === integer / int ===
 <code php> <code php>
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 test(1); test(1);
-test("1337"); 
 test(-1); test(-1);
-test("1."); // Catchable fatal error: Argument 1 passed to test() must be an integer, string given +test("1.");  
- +// Catchable fatal error: Argument 1 passed to test() must be of the type integer, string given ...
-function test(integer $value = '1') { +
-} +
-// Fatal error: Default value for parameters with integer type hint can only be the exact type or NULL+
 </code> </code>
  
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 test(1.1); test(1.1);
 test(.1); test(.1);
-test("1."); +test("1."); // Catchable fatal error: Argument 1 passed to test() must be of the type double, string given
-test("1337"); // Catchable fatal error: Argument 1 passed to test() must be an double, string given +
- +
-function test(double $value = '1') { +
-} +
-// Fatal error: Default value for parameters with double type hint can only be the exact type or NULL+
 </code> </code>
  
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 test(false); test(false);
-test(0); +test(0); // Catchable fatal error: Argument 1 passed to test() must be of the type boolean, null given
-test(1); +
-test('0'); +
-test('1'); +
-test(''); +
-test(null); // Catchable fatal error: Argument 1 passed to test() must be an boolean, null given+
 </code> </code>
  
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 test(fopen(__FILE__, 'r')); test(fopen(__FILE__, 'r'));
-test(NULL); // Catchable fatal error: Argument 1 passed to test() must be an resource, null given+test(NULL); // Catchable fatal error: Argument 1 passed to test() must be of the type resource, null given
 </code> </code>
  
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 test(new stdclass); test(new stdclass);
-test(NULL); // Catchable fatal error: Argument 1 passed to test() must be an object, null given +test(NULL); // Catchable fatal error: Argument 1 passed to test() must be of the type object, null given
- +
-function test(object $value = 1) { +
-} +
-// Fatal error: Default value for parameters with object type hint can only be the exact type or NULL+
 </code> </code>
  
  
-===== Proposal and Patch ===== 
  
-Parameter type hint: +===== Patches & tests =====
  
 +  - Return value type hint: http://felipe.ath.cx/diff/return_type_hint.diff
 +  - Parameter type hint: http://felipe.ath.cx/diff/param_type_hint.diff
 +  - Tests: http://felipe.ath.cx/diff/tests/
  
rfc/typehint.1207618418.txt.gz · Last modified: 2017/09/22 13:28 (external edit)

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