如何学习PHP array_diff_uassoc()
定义和用法
array_diff_uassoc() 函数使用用户自定义的回调函数 (callback) 做索引检查来计算两个或多个数组的差集。返回一个数组，该数组包括了在 array1 中但是不在任何其他参数数组中的值。
注意，与 array_diff() 函数 不同的是，键名也要进行比较。
参数 function 是用户自定义的用来比较两个数组的函数，该函数必须带有两个参数 - 即两个要进行对比的键名。因此与函数array_diff_assoc() 的行为正好相反，后者是用内部函数进行比较的。
返回的数组中键名保持不变。
语法
array_diff_uassoc(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"); $a2=array(3=>"Dog",1=>"Cat",5=>"Horse"); print_r(array_diff_uassoc($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=>"Dog",1=>"Cat",5=>"Horse"); $a3=array(6=>"Bird",0=>"Dog",5=>"Horse"); print_r(array_diff_uassoc($a1,$a2,$a3,"myfunction")); ?>
输出：
Array ( [2] => Horse )
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