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php-Arrays函数-array_flip-交换数组中键和值

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Release: 2016-06-13 10:49:43
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array_flip() 函数交换数组中的键和值

【功能】
         该函数将返回一个反转后的数组,
         即原数组的值变成了新数组的键值,原数组的键值变成了新数组的值
         如果数组中有相同的值,则只有最后的一个具有同样值的才会被反转到新数组
【使用范围】
         php4、php5.
【使用】
         array array_flip( array trans  )
         trans/必需/进行反转的数组
【示例】
[php]
$array1 = array( "blue" => 6, "red" => 2, "green" => 3, "purple" => 4 ); 
$array2 = array( "blue" => 6, "red" => 4, "green" => 6, "purple" => 4 ); 
$array3 = array( "blue" => 6, "red" => 4, "green" => 6, "purple" => '' ); 
 
print_r( array_flip( $array1 ) ); 
print_r( array_flip( $array2 ) ); 
print_r( array_flip( $array3 ) ); 
 
/*
Array
(
    [6] => blue
    [2] => red
    [3] => green
    [4] => purple
)
Array
(
    [6] => green
    [4] => purple
)
Array
(
    [6] => green
    [4] => red
    [] => purple
)
*/ 

 


摘自 zuodefeng的笔记

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