Online PHP editor | output for Qag3c

@ 2022-02-20T01:26:00Z

<?php
$items = array(
    array("itemName" => "Hat", "price" => 10.99, "categories" => ["apparel", "head"]),
    array("itemName" => "Scarf", "price" => 7.99, "categories" => ["apparel", "neck"]),
    array("itemName" => "Watch", "price" => 19.99, "categories" => ["jewelry", "electronics"]),
    array("itemName" => "Necklace", "price" => 99.99, "categories" => ["jewelry", "neck"]),
    array("itemName" => "Headphones", "price" => 29.99, "categories" => ["head", "electronics"])
);


foreach (array_unique(array_merge(...array_values(array_column($items, 'categories')))) as $value) {
   foreach ($items as $item) {
      if (in_array($value, $item['categories'])) {
          $categories[$value][] = $item['itemName'];
      } 
   }
}

print_r($categories);

Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0: Array ( [apparel] => Array ( [0] => Hat [1] => Scarf ) [head] => Array ( [0] => Hat [1] => Headphones ) [neck] => Array ( [0] => Scarf [1] => Necklace ) [jewelry] => Array ( [0] => Watch [1] => Necklace ) [electronics] => Array ( [0] => Watch [1] => Headphones ) )
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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