effiency-test.php

<?php

function elaborateParams($params, $notAllowedKey)
{
    // scorre i parametri dei filtri
    $paramsString = "";
    $paramsStringWithEverything = "";
    
    $i = 0;
    foreach ($params as $key => $param) {
        
        if ($i++ == 0) {
            $startString = '';
        }
        else {
            $startString = '&';
        }

        // completa la stringa, la chiave è il nome del parametro, param è il valore
        $paramsStringWithEverything .= $startString . $key . "=" . $param;

        // non include un determinato parametro
        if ($key != $notAllowedKey) {
            $paramsString .= $startString . $key . "=" . $params;
        }

        // modifica l'array per poi iniettarlo nella view tramite il model
        $params[$key . "Requested"] = $param;

        unset($params[$key]);
    }
    
    echo "Query params: " . $paramsStringWithEverything . "\n";
    echo "Query params (only fruits): " . $paramsString . "\n";
    echo "Requested?: " . (isset($params['appleRequested']) ? 'yes' : 'no') . "\n";
    echo "Count: " . count($params['appleRequested']) . "\n";
}

$params = [
  'apple'   => 'red',
  'ananas'  => 'yellow',
  'kiwi'    => 'brown',
  'unicorn' => 'pink',
];

elaborateParams($params, 'unicorn');

/*
  Expeceted result:
  
  Query params: apple=red&ananas=yellow&kiwi=brown&unicorn=pink
  Query params (only fruits): apple=red&ananas=yellow&kiwi=brown
  Requested?: yes
  Count: 4
*/