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php-Arrays函数-chunk-将一个数组分割成多个数组

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Release: 2016-06-13 10:49:41
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chunk() 函数
【功能】
         该函数将将一个数组分割成多个数组,
         其中每个数组的单元数目有size决定
         最后一个数组的单元数目可能会少几个
         得到的数组是一个多维数组中的单元,其索引从零开始
【使用范围】
         >=4.2.0、php5
【使用】
         array array_chunk(array input ,int size [,bool preserve_keys] )
         input/必需/被分割的数组
         size/必需/分割数来数组的单元数目
         preserve_keys/可选/True保留数组原来的键名,
                  False键名为从零开始的数字索引,默认为False
【示例】
[php]
        $arr = array( "key1" => "val1", "key2" => "val2",  
                      "key3" => "val3", "key4" => "val4"); 
        print_r( array_chunk( $arr, 2 ) ); 
        print_r( array_chunk( $arr, 2, True ) ); 
        print_r( array_chunk( $arr, 3 ) ); 
/*
Array
(
    [0] => Array
        (
            [0] => val1
            [1] => val2
        )
 
    [1] => Array
        (
            [0] => val3
            [1] => val4
        )
 
)
Array
(
    [0] => Array
        (
            [key1] => val1
            [key2] => val2
        )
 
    [1] => Array
        (
            [key3] => val3
            [key4] => val4
        )
 
)
Array
(
    [0] => Array
        (
            [0] => val1
            [1] => val2
            [2] => val3
        )
 
    [1] => Array
        (
            [0] => val4
        )
 
)
*/
 

 

 

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