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Eine logische Erklärung wäre, das die Variablen aus diesem Teil

case 'gender-male':
$sql = "SELECT COUNT(user_id) AS total_male
FROM " . USERS_TABLE . "
WHERE user_gender = '1'";
break;
case 'gender-female':
$sql = "SELECT COUNT(user_id) AS total_female
FROM " . USERS_TABLE ...