Loop two arrays without duplicate values from the first array

I’m not 100% sure about the title (something is missing), but I’m 100% sure what output I need.

$A = array('0' => '1451', '1' => '1451', '2' => '1452', '3' => '1452', '4' => '1453', '5' => '1453', '6' => '1457', '7' => '1460');
$B = array('0' => '22',   '1' => '23',   '2' => '22',   '3' => '23',   '4' => '22',   '5' => '23',   '6' => '',     '7' => '');
    
          for ($i=0, $n=sizeof($A); $i<$n; $i++) {
               echo $A[$i] . ' = ' . $B[$i] . '<br />';
          }
          echo '<hr></hr>';
          echo 'I need this output, is possible: 
          1451 = 22, 23<br />
          1452 = 22, 23<br />
          1453 = 22, 23<br />
          1457 =<br />
          1460 = ';

You can run the code here: https://extendsclass.com/php-bin/3baf302

Answer

With a for loop, you need a change in your code:

<?php
// Input
$A = array('0' => '1451', '1' => '1451', '2' => '1452', '3' => '1452', '4' => '1453', '5' => '1453', '6' => '1457', '7' => '1460');
$B = array('0' => '22',   '1' => '23',   '2' => '22',   '3' => '23',   '4' => '22',   '5' => '23',   '6' => '',     '7' => '');

// Output array
$O = array();    
for ($i = 0, $n = count($A); $i < $n; $i++) {
    $O[$A[$i]][] = $B[$i];
}

// Print the output
foreach ($O as $key => $items) {
    echo $key." = ".implode(',', $items)."<br>";
}   
?>