【转】PHP5.3亲测精髓特性整理

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

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

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

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

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();

        $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");

        gc_enable(); // 允许垃圾回收     var_dump(gc_enabled()); // true      var_dump(gc_collect_cycles()); // 某个元素的清理      gc_disable(); // 禁止垃圾回收

    $fubar = "xxx";      $xbar = <<<ONE         this is HEREDOC $fubar     ONE;      $abar = <<<'TWO'         this is NOWDOC $fubar     TWO;     echo $xbar."|".$abar;

    $ofun = create_function('$a, $b', 'return $a*$b;'); //不要忘了分号，传统方法     echo $ofun(2, 5);      $nfun = function ($a, $b){         return $a*$b;     };//不要忘了分号，现代方法      echo $nfun(3, 5);

    $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();

    namespace xxx; //第一个namespace需要在所有输出之前     function t(){         return __NAMESPACE__;     }      namespace xxx;      function t(){         return __NAMESPACE__;     }      echo \xx\t()."|";     echo \xxx\t();