How to merge two arrays by its values in PHP? - php

Question

What I need is really simple:
I have two arrays like that:
<?php
$a1 = [1,2,3];
$a2 = [2,3,4];
I need to combine them so that the result is:
$result = [1,2,3,4];
I've tried array_merge but the result was [1,2,3,2,3,4]

Answer 1

You can find an answer to this here: Set Theory Union of arrays in PHP
By expanding on your current method. You can call array_unique and sort on the resulting array.
$a = [1,2,3];
$b = [2,3,4];
$result = array_merge($a, $b);
$result = array_unique($result);
sort($result);
This will result in:
array(4) {
[0] = int(1) 1
[1] = int(1) 2
[2] = int(1) 3
[3] = int(1) 4
}

Answer 2

function merges(/*...*/){
$args=func_get_args();
$ret=array();
foreach($args as $arg){
foreach($arg as $key=>$v)
{
$ret[$key]=$v;
}
}
return $ret;
}
untested, but i guess this would work.. will delete all duplicate keys and return the last key/value pair it found of duplicates

Answer 3

This might be what you are looking for
$result = $a1 + $a2 //union operation
reference
Array Operations
Example
$a = array("a" => "apple", "b" => "banana");
$b = array("a" => "pear", "b" => "strawberry", "c" => "cherry");
$c = $a + $b; // Union of $a and $b
echo "Union of \$a and \$b: \n";
var_dump($c);
Ouput
Union of $a and $b:
array(3) {
["a"]=>
string(5) "apple"
["b"]=>
string(6) "banana"
["c"]=>
string(6) "cherry"
}