PHP |向上或向下移动（键、值）对的程序-yiteyi-C++库

给定一个包含键、值对的数组，我们需要使用键向上或向下移动特定值。

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例如：

Input : $continents = array(
                      'First' => 'Asia',
                      'Second' => 'Europe',
                      'Third' => 'North America',
                      'Fourth' => 'South America',
                            );
        move_to_up($continents, 'Third');
Output : Array
(
    [Third] => North America
    [First] => Asia
    [Second] => Europe
    [Fourth] => South America
)

Input :$continents = array(
                      'First' => 'Asia',
                      'Second' => 'Europe',
                      'Third' => 'North America',
                      'Fourth' => 'South America',
                            );
       move_to_bottom($continents, 'Second');
Output : Array
(
    [First] => Asia
    [Third] => North America
    [Fourth] => South America
    [Second] => Europe
)

使用下面描述的PHP函数可以解决上述问题： 取消设置（）： 函数将销毁指定的变量。

方法： 我们准备了一个带有指定键的临时数组（要向上移动或在底部移动的值），然后根据是向上移动还是在底部移动的目的，取消设置最后附加的键。

下面是该方法的实现 代码1： 移动关键点，值在顶部

                     <?php                   
                             
                                         $continents                               =                               array                               (                   
                                         'First'                               =>                               'Asia'                               ,                   
                                         'Second'                               =>                               'Europe'                               ,                   
                                         'Third'                               =>                               'North America'                               ,                   
                                         'Fourth'                               =>                               'South America'                               ,                   
                                         );                   
                             
                                         move_to_up(                               $continents                               ,                               'Third'                               );                   
                                         print_r (                               $continents                               );                   
                             
                     function                               move_to_up(&                               $continents                               ,                               $string                               )                   
                                         {                   
                                         $var                               =                               array                               (                               $string                               =>                               $continents                               [                               $string                               ]);                   
                                         unset(                               $continents                               [                               $string                               ]);                   
                                         $continents                               =                               $var                               +                               $continents                               ;                   
                                         }                   
                     ?>                   

输出：

Array
(
    [Third] => North America
    [First] => Asia
    [Second] => Europe
    [Fourth] => South America
)

代码2： 移动关键点，值位于底部

                     <?php                   
                             
                                         $continents                               =                               array                               (                   
                                         'First'                               =>                               'Asia'                               ,                   
                                         'Second'                               =>                               'Europe'                               ,                   
                                         'Third'                               =>                               'North America'                               ,                   
                                         'Fourth'                               =>                               'South America'                               ,                   
                                         );                   
                                         move_to_bottom(                               $continents                               ,                               'Second'                               );                   
                                         print_r (                               $continents                               );                   
                             
                                         function                               move_to_bottom(&                               $continents                               ,                               $string                               )                   
                                         {                   
                                         $var                               =                               array                               (                               $string                               =>                               $continents                               [                               $string                               ]);                   
                                         unset(                               $continents                               [                               $string                               ]);                   
                                         $continents                               =                               $continents                               +                               $var                               ;                   
                                         }                   
                             
                     ?>                   

输出：

Array
(
    [First] => Asia
    [Third] => North America
    [Fourth] => South America
    [Second] => Europe
)

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