php-Arrays函数-array_diff-计算数组的差集
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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