How to get a unique union of two arrays in php without using in built php array functions?

Question

$a = ['Ava', 'Emma', 'Olivia']; $b = ['Olivia', 'Sophia', 'Emma'];

I want the output to be ['Emma', 'Olivia', 'Ava', 'Sophia'] in any particular order without using array functions.

This is what i tried

<?php
//function unique_names($a,$b){
$a = ['Ava', 'Emma', 'Olivia'];
$b = ['Olivia', 'Sophia', 'Emma'];
$z= $a;
$c = count($b);
$d = count($a);
//loop for b
    $e = 0;
for($i=0;$i<$c;$i++){ //b
    
    for($j=0;$j<$d;$j++){
            
        if($b[$i] != $a[$j]){
        $z[$d+1] = $b[$i];
        break;
        }else{
            //$z[$e] = $a[$j];
        }
  
    }
    
 
        
    
}
echo"<pre>ans";print_r($z);
die;
//return $z;
//}


//echo"<pre>ans"; print_r(unique_names($a,$b));
?>

Also i made it work using in_array but was later told that even that function is not allowed.

<?php
function unique_names($a,$b){
$z= $a;
$c = count($b);
$d = count($a);
for($i=0;$i<$c;$i++){
    
  if(! in_array($b[$i], $a)){
            $z[$d+1] = $b[$i];
  }
        
    
}
return $z;
}
$a = ['Ava', 'Emma', 'Olivia'];
$b = ['Olivia', 'Sophia', 'Emma'];

print_r(unique_names($a,$b));
?>

Does this answer your question? PHP merge arrays with only NOT DUPLICATED values — nbk
– nbk, Commented May 13, 2021 at 15:26
"...without using array functions" sounds like an assignment. So, what have you tried? Where did you get stuck? Please note that while we're glad to help with any issues you encounter, you are still expected to make an honest effort at solving this task yourself. — El_Vanja
– El_Vanja, Commented May 13, 2021 at 15:28
I have made the changes in question and have added what i tried. Thanks — Parin Nagda
– Parin Nagda, Commented May 13, 2021 at 15:47

Slava Rozhnev · Accepted Answer · 2021-05-13 16:24:34Z

2

You can use next code:

<?php
$a = ['Ava', 'Emma', 'Olivia']; 
$b = ['Olivia', 'Sophia', 'Emma'];

$values = [];

// Add values from first array
foreach($a as $v) {
    $values[$v] = true;
}

// Add values from second array
// all exists names will be overwrited
// new values will be addded
foreach($b as $v) {
    $values[$v] = true;
}

// Transform keys to plain result
foreach($values as $key=>$val) {
    $result[] = $key;
}
var_dump($result);

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answered May 13, 2021 at 16:24

Slava Rozhnev

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