Function array_diff_ukey() for user-defined function comparison key names in php

Example

Compare the key names of two arrays (use user custom function to compare key names), and return the difference set:

<?php
function myfunction($a,$b)
{
if ($a===$b)
{
return 0;
}
return ($a>$b)?1:-1;
}

$a1=array("a"=>"red","b"=>"green","c"=>"blue");
$a2=array("a"=>"blue","b"=>"black","e"=>"blue");

$result=array_diff_ukey($a1,$a2,"myfunction");
print_r($result);
?>

Definition and usage

array_diff_ukey() function is used to compare the key names of two (or more) arrays and return the difference set.

Note: This function uses a user-defined function to compare key names!

This function compares the key names of two (or more) arrays and returns a difference array that includes everything in the compared array (array1) but not in any other parameter array (array2 or array3, etc.).

Syntax

array_diff_ukey(array1,array2,array3...,myfunction);

Technical details

更多实例

实例 1

比较三个数组的键名（使用用户自定义函数比较键名），并返回差集：

<?php
function myfunction($a,$b)
{
if ($a===$b)
{
return 0;
}
return ($a>$b)?1:-1;
}

$a1=array("a"=>"red","b"=>"green","c"=>"blue");
$a2=array("a"=>"black","b"=>"yellow","d"=>"brown");
$a3=array("e"=>"purple","f"=>"white","a"=>"gold");

$result=array_diff_ukey($a1,$a2,$a3,"myfunction");
print_r($result);
?>

1.函数的作用：使用调用者自定义的函数，根据键值，返回数组的差集；

2.函数的参数：

　　@params array $array1 被比较的数组

　　@params array $array2 比较的数组

　　@params array $array3 比较的数组

　　...

3.注意点：

　　1）自定义的函数根据第一个参数小于、等于、大于分别返回小于0、等于0、大于0；

4.例子：

<?php
$array1 = [&#39;A&#39; => 1,&#39;B&#39; => 2,&#39;c&#39; => 3,0 => 4];
$array2 = [&#39;A&#39; => 1,&#39;b&#39; => 2,&#39;C&#39; => 3,&#39;0&#39; => 4];
print_r(array_diff_ukey($array1,$array2,function($a,$b){
    if($a === $b)
    {
        return 0;
    }
    return $a < $b ? -1 : 1;
}));

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