// Prevent duplicate post titles with more than 80% similarity
function prevent_duplicate_titles($data, $postarr) {
// Check if post title is empty or not a post
if (empty($data['post_title']) || $data['post_type'] != 'post') {
return $data;
}
// Normalize the title for comparison
$current_title = strtolower(trim($data['post_title']));
$normalized_title = preg_replace('/\b(the|and|of|a|an|is|in|on|at|to|for)\b/i', '', $current_title);
// Query all existing posts
global $wpdb;
$query = $wpdb->prepare("
SELECT post_title
FROM {$wpdb->posts}
WHERE post_status IN ('publish', 'draft', 'pending')
AND post_type = %s
AND ID != %d
", $data['post_type'], isset($postarr['ID']) ? $postarr['ID'] : 0);
$posts = $wpdb->get_results($query);
// Compare current title with existing ones
foreach ($posts as $post) {
$existing_title = strtolower(trim($post->post_title));
$normalized_existing_title = preg_replace('/\b(the|and|of|a|an|is|in|on|at|to|for)\b/i', '', $existing_title);
// Check similarity
similar_text($normalized_title, $normalized_existing_title, $percent);
if ($percent > 90) {
// Set an error message
wp_die(
'Error: This title is too similar to an existing post title. Please use a different title.',
'Duplicate Title Detected',
array('back_link' => true)
);
}
}
return $data;
}
add_filter('wp_insert_post_data', 'prevent_duplicate_titles', 10, 2);
function add_whatsapp_button_after_content($content) {
if (is_single()) {
// WhatsApp page link
$pdf_page_link = "https://professorofurdu.com/get-your-pdf/";
// Button HTML
$whatsapp_button = '
وٹسپ پر اس فائل کا پی ڈی ایف یہاں سے حاصل کریں
';
return $content . $whatsapp_button;
}
return $content;
}
add_filter('the_content', 'add_whatsapp_button_after_content');
