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php-Arrays函数-array_diff-计算数组的差集

Jun 13, 2016 am 10:49 AM
arraydifffunctiondifference setarrayofcalculate

array_diff() 函数 计算数组的差集

【功能】
         该函数将返回一个数组,
         该数组包含了所有在array1中但是不在其他任何参数数组中的值。
         注意原数组的键名保持不变。
【使用范围】
         php4 > 4.0.1、php5.
【使用】
         array array_diff( array array1, array array2[,array...]  )
         array1/必需/数组1
         array2/必需/比较的数组 最少得有一个
         array.../可选/用来比较的数组
【示例】
[php]
//分别定义两个数组 
$array1 = array( "blue" => 6, "red" => 2, "green" => 3, "purple" => 4 ); 
$array2 = array( "green" => 5, "blue" => 6, "yellow" => 7, "cyan" => 8 ); 
print_r( array_diff( $array1, $array2 ) ); 
/*
Array
(
    [red] => 2
    [green] => 3
    [purple] => 4
)
*/ 

 


摘自 zuodefeng的笔记

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