php ::一个函数做array_unique（array_merge（$ a，$ b））;

I am aware that I can use array_unique(array_merge($a,$b));

to merge two arrays and then remove any duplicates,

but,

is there an individual function that will do this for me?

(I know I could write one myself that just calls these, but I am just wondering).

There is no such function. Programming languages in general give you a certain set of tools (functions) and you can then combine them to get the results you want.

There really is no point in creating a new function for every use case there is, unless it is a very common use case - and yours does not seem to be one.

No, array_unique(array_merge($a,$b)); is the way to do it.

See the list of array functions.

By default no there isn't. You can do it another way (which might not be that smart though)

$array1 = array('abc', 'def');
$array2 = array('zxd', 'asdf');

$newarray = array_unique(array($array1, $array2));

does sort of the same thing. Just wondering why isn't what you posted good enough?

//usage $arr1=array(0=>"value0", 1=>"value1", 2=>"value2"); $arr2=array(0=>"value3", 1=>"value4", 2=>"value0") => $result=mergeArrays($arr1,$arr2); $result=Array ( [0] => value0 [1] => value1 [2] => value2 [3] => value3 [4] => value4 )

function mergeArrays () {
    $result=array();
    $params=func_get_args();
    if ($params) foreach ($params as $param) {
        foreach ($param as $v) $result[]=$v;
    }
    $result=array_unique($result);
    return $result;
}

In php 5.6+ you can also use the new argument unpacking to avoid multiple array_merge calls (which significantly speed up your code): https://3v4l.org/arFvf

<?php

$array = [
    [1 => 'french', 2 => 'dutch'],
    [1 => 'french', 3 => 'english'],
    [1 => 'dutch'],
    [4 => 'swedish'],
];

var_dump(array_unique(array_merge(...$array)));

Outputs:

array(4) {
  [0]=>
  string(6) "french"
  [1]=>
  string(5) "dutch"
  [3]=>
  string(7) "english"
  [5]=>
  string(7) "swedish"
}