如何学习PHP array_diff_ukey()
定义和用法
array_diff_ukey() 返回一个数组,该数组包括了所有出现在 array1 中但是未出现在任何其它参数数组中的键名的值。注意关联关系保留不变。与 array_diff() 不同的是,比较是根据键名而不是值来进行的。
此比较是通过用户提供的回调函数来进行的。如果认为第一个参数小于,等于,或大于第二个参数时必须分别返回一个小于零,等于零,或大于零的整数。
语法
array_diff_ukey(array1,array2,array3...,function)
参数
描述
array1必需。与其他数组进行比较的第一个数组。
array2必需。与第一个数组进行比较的数组。
array3可选。与第一个数组进行比较的数组。可以有多个。
function必需。用户自定义函数的名称。
例子 1
$v2) { return 1; } else { return -1; } } $a1=array(0=>"Dog",1=>"Cat",2=>"Horse"); $a2=array(3=>"Rat",1=>"Bird",5=>"Monkey"); print_r(array_diff_ukey($a1,$a2,"myfunction")); ?>
输出:
Array ( [0] => Dog [2] => Horse )
例子 2
如何为该函数分配多个数组:
$v2) { return 1; } else { return -1; } } $a1=array(0=>"Dog",1=>"Cat",2=>"Horse"); $a2=array(3=>"Rat",1=>"Bird",5=>"Monkey"); $a3=array(6=>"Dog",7=>"Donkey",0=>"Horse"); print_r(array_diff_ukey($a1,$a2,$a3,"myfunction")); ?>
输出:
Array ( [2] => Horse )

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