PHP5.3 collation of the essence of the test-php Tutorial

[Switch] PHP5.3 test the essence of features finishing 1. introduce _ DIR _ magic constant to locate the script directory echo _ DIR __. |. dirname (_ FILE _); 2. allow orand expressions with two values to quickly obtain a non-empty value echo (1? : 0). | .(? : 0). |. var_export (array ()? : [Switch] PHP5.3 test the essence of features
1. introduce the _ DIR _ magic constant to locate the script directory.

    echo __DIR__."|".dirname(__FILE__);

2. allow the or/and expression with two values to quickly obtain a non-null value.

    echo (1 ?: 0) ."|". ("" ?: 0)."|". var_export(array() ?: array(1), true);

3. add the _ callStatic method to the class. it is equivalent to _ call (), but it is prepared to call the static method. The following is an example:

    class xxx{         function __call($func, $args){             echo "function name:".$func;             echo "
";             echo "args:".var_export($args, true);         }         static function __callStatic($func, $args){             echo "static function name:".$func;             echo "
";             echo "static args:".var_export($args, true);         }     }     $x = new xxx();     $x->testfunc("oo");     echo "
";     xxx::teststatic("xx");

4. Dynamic Call of static methods

    class xx{         static function test(){             echo __METHOD__;         }     }     $c = "xx";     $m = "test";     $c::$m();

5. delayed static binding (when static processing delays execution from compilation)

class A{     static function whoami(){         echo __CLASS__;     }      static function say1(){         self::whoami();     }      static function say2(){         static::whoami();     } }  class B extends A{     static function whoami(){         echo __CLASS__;     } }  class C extends A{     static function whoami(){         echo __CLASS__;     } }  B::say1(); C::say2();

6. MySQLInd (high-speed MySQL call library interface specially designed for PHP)
7. INI Magic
8. extended OpenSSL functions
9. SPL (Standard PHP Library) optimization
10. time processing is extended and added

        $date = strtotime("11-05-17 00:00:00");     echo date("Y-m-d", $date)."|";      $date = date_create_from_format("y-m-d", "11-05-17");     echo $date->format("Y-m-d");

11. garbage collector (cleaning of memory released for the execution end cycle of complex and long-running scripts)

Gc_enable (); // permit garbage collection var_dump (gc_enabled (); // true var_dump (gc_collect_cycles (); // clear gc_disable () for an element (); // prohibit garbage collection

12. NOWDOC (do not translate HEREDOC)

$ Fubar = "xxx"; $ xbar = <
 
  

  
13. Anonymous function experience
  

  

  
$ Ofun = create_function ('$ a, $ B', 'return $ a * $ B; '); // do not forget the semicolon. echo $ ofun (2, 5); $ nfun = function ($ a, $ B) {return $ a * $ B;}; // do not forget the semicolon, modern method echo $ nfun (3, 5 );
  

  
14. closure experience
  

  

  
    $arr = array(1, 2, 3, 5, 6, 7);     $res = array_filter($arr, function($v) { return $v >4; });     var_dump($res);      function countnum(){         $num = 0;         $testt = function() use(&$num){             ++$num;             echo $num;         };         return $testt;     }      $t = countnum();     $t();     $t();
  

  
15. namespace
  

  

  
Namespace xxx; // before the first namespace is output, function t () {return _ NAMESPACE __;} namespace xxx; function t () {return _ NAMESPACE __;} echo \ xx \ t (). "|"; echo \ xxx \ t ();