141 lines
3.6 KiB
PHP
141 lines
3.6 KiB
PHP
<?php
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/*
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Plugin Name: Search Hilite
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Plugin URI: http://wordpress.org/#
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Description: When someone is referred from a search engine like Google, Yahoo, or WordPress' own, the terms they search for are highlighted with this plugin. Packaged by <a href="http://photomatt.net/">Matt</a>.
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Version: 1.2
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Author: Ryan Boren
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Author URI: http://rboren.nu
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*/
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/* Highlighting code c/o Ryan Boren */
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function get_search_query_terms($engine = 'google') {
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$search = get_query_var('s');
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$search_terms = get_query_var('search_terms');
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$referer = urldecode($_SERVER['HTTP_REFERER']);
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$query_array = array();
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switch ($engine) {
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case 'google':
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// Google query parsing code adapted from Dean Allen's
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// Google Hilite 0.3. http://textism.com
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$query_terms = preg_replace('/^.*q=([^&]+)&?.*$/i','$1', $referer);
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$query_terms = preg_replace('/\'|"/', '', $query_terms);
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$query_array = preg_split ("/[\s,\+\.]+/", $query_terms);
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break;
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case 'lycos':
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$query_terms = preg_replace('/^.*query=([^&]+)&?.*$/i','$1', $referer);
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$query_terms = preg_replace('/\'|"/', '', $query_terms);
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$query_array = preg_split ("/[\s,\+\.]+/", $query_terms);
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break;
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case 'yahoo':
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$query_terms = preg_replace('/^.*p=([^&]+)&?.*$/i','$1', $referer);
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$query_terms = preg_replace('/\'|"/', '', $query_terms);
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$query_array = preg_split ("/[\s,\+\.]+/", $query_terms);
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break;
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case 'wordpress':
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// Check the search form vars if the search terms
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// aren't in the referer.
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if ( ! preg_match('/^.*s=/i', $referer)) {
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if (!empty($search_terms)) {
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$query_array = $search_terms;
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} else if (isset($search)) {
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$query_array = array($search);
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}
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break;
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}
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$query_terms = preg_replace('/^.*s=([^&]+)&?.*$/i','$1', $referer);
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$query_terms = preg_replace('/\'|"/', '', $query_terms);
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$query_array = preg_split ("/[\s,\+\.]+/", $query_terms);
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break;
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}
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return $query_array;
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}
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function is_referer_search_engine($engine = 'google') {
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$siteurl = get_settings('home');
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if( empty($_SERVER['HTTP_REFERER']) ) {
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return 0;
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}
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$referer = urldecode($_SERVER['HTTP_REFERER']);
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//echo "referer is: $referer<br />";
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if ( ! $engine ) {
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return 0;
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}
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switch ($engine) {
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case 'google':
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if (preg_match('|^http://(www)?\.?google.*|i', $referer)) {
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return 1;
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}
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break;
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case 'lycos':
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if (preg_match('|^http://search\.lycos.*|i', $referer)) {
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return 1;
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}
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break;
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case 'yahoo':
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if (preg_match('|^http://search\.yahoo.*|i', $referer)) {
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return 1;
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}
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break;
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case 'wordpress':
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if (preg_match("#^$siteurl#i", $referer)) {
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return 1;
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}
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break;
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}
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return 0;
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}
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function hilite($text) {
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$search_engines = array('wordpress', 'google', 'lycos', 'yahoo');
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foreach ($search_engines as $engine) {
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if ( is_referer_search_engine($engine)) {
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$query_terms = get_search_query_terms($engine);
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foreach ($query_terms as $term) {
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if (!empty($term) && $term != ' ') {
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$term = preg_quote($term, '/');
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if (!preg_match('/<.+>/',$text)) {
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$text = preg_replace('/(\b'.$term.'\b)/i','<span class="hilite">$1</span>',$text);
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} else {
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$text = preg_replace('/(?<=>)([^<]+)?(\b'.$term.'\b)/i','$1<span class="hilite">$2</span>',$text);
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}
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}
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}
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break;
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}
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}
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return $text;
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}
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function hilite_head() {
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echo "
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<style type='text/css'>
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.hilite {
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color: #fff;
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background-color: #f93;
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}
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</style>
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";
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}
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// Highlight text and comments:
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add_filter('the_content', 'hilite');
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add_filter('comment_text', 'hilite');
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add_action('wp_head', 'hilite_head');
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?>
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