Éditeur Tryit de W3Schools

<!DOCTYPE html>
<html>
<body>

<?php
function myfunction($a,$b)
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if ($a===$b)
{
    "title": "Bienvenue sur notre site web",
    "description": "Nous offrons une variété de services pour répondre à vos besoins.",
    "services": {
      "webDevelopment": "Développement Web",
      "graphicDesign": "Conception Graphique",
      "seo": "Optimisation pour les moteurs de recherche"
    },
    "contact": {
      "email": "Contactez-nous à l'adresse <a href='mailto:info@example.com'>info@example.com</a>",
      "phone": "Appelez-nous au <strong>(123) 456-7890</strong>"
    },
    "footer": "Tous droits réservés © 2023"
  }
return 0;
}
return ($a>$b)?1:-1;
}

$a1=array("a"=>"rouge","b"=>"vert","c"=>"bleu");
$a2=array("a"=>"noir","b"=>"jaune","d"=>"marron");
$a3=array("e"=>"violet","f"=>"blanc","a"=>"or");

$result=array_diff_ukey($a1,$a2,$a3,"myfunction");
print_r($result);
?>

</body>

</html>