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Senior Member
Iscritto dal: Aug 2004
Città: Milano
Messaggi: 1310
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Modifica a plugin Wordpress
Ciao a tutti, ho installato questo plugin sul mio blog:
http : // justinsomnia.org/2005/09/random-image-plugin-for-wordpress/
Permette di visualizzare in modo random X immagini di articoli. Il plug-in funziona perfettamente però le immagini vengono scelte tra tutte quelle pubblicate però vorrei far si che visualizzasse solo le immagini principali che sono di un formato preciso: 360x240 oppure 300x200.
Non so se wordpress è in grado di distinguere le immagini principali dalle altre... se non fosse possibile credo che l'unica alternativa sia mettere una condizione dicendo: visualizza l'immagine solo se è di una delle due dimensioni sopraindicate.
Purtroppo non ho idee su come fare questa modifica, qualcuno potrebbe aiutarmi?
Questo è il php del plugin:
Codice PHP:
<?php
// widgetization
function widget_randomimage_init() {
if (!function_exists('register_sidebar_widget')) {
return;
}
function widget_randomimage() {
print '<li>' . "\n";
randomimage();
print '</li>' . "\n";
}
register_sidebar_widget('Random Image', 'widget_randomimage');
}
add_action('plugins_loaded', 'widget_randomimage_init');
// add configuration page to WordPress
function randomimage_add_page()
{
add_options_page('Random Image', 'Random Image', 6, __FILE__, 'randomimage_configuration_page');
}
add_action('admin_menu', 'randomimage_add_page');
// helper function to set randomimage defaults (if necessary)
// and return array of options
function get_randomimage_options()
{
$randomimage_options = get_option('randomimage_options');
if (!isset($randomimage_options["image_template_html"]) || $randomimage_options["image_template_html"] == '') {
if (isset($randomimage_options["show_post_title"]) || isset($randomimage_options["show_alt_caption"])) {
// lets upgrade from v3
$upgraded_template = '';
if ($randomimage_options["show_post_title"] === true) {
$upgraded_template .= "\n<strong>%1</strong><br />\n";
}
$upgraded_template .= "%2";
if ($randomimage_options["show_alt_caption"] === true) {
$upgraded_template .= "<br />\n<em>%3</em>\n";
}
$randomimage_options["image_template_html"] = $upgraded_template;
unset($randomimage_options["show_post_title"]);
unset($randomimage_options["show_alt_caption"]);
} else {
$randomimage_options["image_template_html"] = "\n<strong>%1</strong><br />\n%2<br />\n<em>%3</em>\n";
}
}
// init default options if options aren't set
if (!isset($randomimage_options["show_images_in_posts"])) {
$randomimage_options["show_images_in_posts"] = true;
}
if (!isset($randomimage_options["show_images_in_pages"])) {
$randomimage_options["show_images_in_pages"] = false;
}
if (!isset($randomimage_options["show_images_in_galleries"])) {
$randomimage_options["show_images_in_galleries"] = true;
}
if (!isset($randomimage_options["number_of_images"])) {
$randomimage_options["number_of_images"] = 1;
}
if (!isset($randomimage_options["image_attributes"])) {
$randomimage_options["image_attributes"] = "";
}
if (!isset($randomimage_options["inter_image_html"])) {
$randomimage_options["inter_image_html"] = "<br /><br />";
}
if (!isset($randomimage_options["image_src_regex"])) {
$randomimage_options["image_src_regex"] = "";
}
if (!isset($randomimage_options["category_filter"])) {
$randomimage_options["category_filter"] = array();
}
if (!isset($randomimage_options["sort_images_randomly"])) {
$randomimage_options["sort_images_randomly"] = true;
}
if (!isset($randomimage_options["image_class_match"])) {
$randomimage_options["image_class_match"] = "";
}
add_option('randomimage_options', $randomimage_options);
return $randomimage_options;
}
// generate configuration page
function randomimage_configuration_page()
{
$randomimage_options = get_randomimage_options();
// if form has been submitted, save values
if (isset($_POST['submit'])) {
// booleanize all the checkboxes
isset($_POST['show_images_in_posts']) ? $_POST['show_images_in_posts'] = true : $_POST['show_images_in_posts'] = false;
isset($_POST['show_images_in_pages']) ? $_POST['show_images_in_pages'] = true : $_POST['show_images_in_pages'] = false;
isset($_POST['show_images_in_galleries']) ? $_POST['show_images_in_galleries'] = true : $_POST['show_images_in_galleries'] = false;
isset($_POST['sort_images_randomly']) ? $_POST['sort_images_randomly'] = true : $_POST['sort_images_randomly'] = false;
// correct for empty image number
if ($_POST['number_of_images'] < 1) {
$_POST['number_of_images'] = 1;
}
// correct for posts and pages and galleries being deselected
if (!$_POST['show_images_in_posts'] && !$_POST['show_images_in_pages']) {
$_POST['show_images_in_posts'] = true;
}
if (!is_array($_POST['category_filter'])) {
$_POST['category_filter'] = array();
}
if (trim($_POST['image_template_html']) == '') {
$_POST['image_template_html'] = "\n<strong>%1</strong><br />\n%2<br />\n<em>%3</em>\n";
}
// create array of new options
$randomimage_options = array(
"show_images_in_posts" => $_POST['show_images_in_posts'],
"show_images_in_pages" => $_POST['show_images_in_pages'],
"show_images_in_galleries" => $_POST['show_images_in_galleries'],
"number_of_images" => $_POST['number_of_images'],
"image_attributes" => stripslashes($_POST['image_attributes']),
"inter_image_html" => stripslashes($_POST['inter_image_html']),
"image_src_regex" => stripslashes($_POST['image_src_regex']),
"category_filter" => $_POST['category_filter'],
"sort_images_randomly" => $_POST['sort_images_randomly'],
"image_class_match" => stripslashes(trim($_POST['image_class_match'])),
"image_template_html" => stripslashes($_POST['image_template_html'])
);
update_option('randomimage_options', $randomimage_options);
}
?>
<div class="wrap">
<h2>Random Image Settings</h2>
<form method="post" action="">
<p><strong>Instructions:</strong> Use the following options to configure how you want the plugin to behave. The Sample Output at the bottom of the page will reflect the changes you've made. When you're satisfied, goto <a href="widgets.php">Design > Widgets</a> and add "Random Image" to your sidebar (if your theme is widget-enabled). Otherwise you can manually edit your index.php or sidebar.php template files and add <code style="font-weight:bold;"><?php randomimage(); ?></code> where you want the random image to appear.
<div style="clear: both;padding-top:10px;">
<label style="float:left;width:250px;text-align:right;padding-right:6px;" for="show_images_in_posts">Include images from posts?</label>
<div style="float:left;"><input type="checkbox" id="show_images_in_posts" name="show_images_in_posts" <?php if ($randomimage_options["show_images_in_posts"]) print "checked='on'"; ?>/> <label for="show_images_in_pages">Pages?</label> <input type="checkbox" id="show_images_in_pages" name="show_images_in_pages" <?php if ($randomimage_options["show_images_in_pages"]) print "checked='on'"; ?>/><br /></div>
</div>
<div style="clear: both;padding-top:10px;">
<label style="float:left;width:250px;text-align:right;padding-right:6px;" for="show_images_in_galleries">Include images from galleries?</label>
<div style="float:left;"><input type="checkbox" id="show_images_in_galleries" name="show_images_in_galleries" <?php if ($randomimage_options["show_images_in_galleries"]) print "checked='on'"; ?>/><br /></div>
</div>
<div style="clear: both;padding-top:10px;">
<label style="float:left;width:250px;text-align:right;padding-right:6px;" for="sort_images_randomly">Sort Images Randomly?</label>
<div style="float:left;"><input type="checkbox" id="sort_images_randomly" name="sort_images_randomly" <?php if ($randomimage_options["sort_images_randomly"]) print "checked='on'"; ?>/> Uncheck if you want to show recent images rather than random images<br /></div>
</div>
<div style="clear: both;padding-top:10px;">
<label style="float:left;width:250px;text-align:right;padding-right:6px;padding-top:7px;" for="number_of_images">How many images to display?</label>
<div style="float:left;"><input type="text" id="number_of_images" name="number_of_images" size="1" maxlength="2" <?php if ($randomimage_options["number_of_images"]) print "value='" . $randomimage_options["number_of_images"] . "'"; ?>/></div>
</div>
<div style="clear: both;padding-top:10px;">
<label style="float:left;width:250px;text-align:right;padding-right:6px;padding-top:7px;" for="image_template_html">HTML Template:<br/><code>%1</code> = title<br /><code>%2</code> = image<br /><code>%3</code> = caption<br /><code>%4</code> = excerpt</label>
<div style="float:left;"><textarea id="image_template_html" name="image_template_html" rows="4" cols="24" style="float:left;"><?php if ($randomimage_options["image_template_html"]) print stripslashes(htmlspecialchars($randomimage_options["image_template_html"])); ?></textarea>
e.g. <code style="font-weight:bold;"><strong>%1</strong><br /><br />%2<br /><br /><em>%3</em><code></div>
</div>
<div style="clear: both;padding-top:10px;">
<label style="float:left;width:250px;text-align:right;padding-right:6px;padding-top:7px;" for="inter_image_html">HTML between images:</label>
<div style="float:left;"><input type="text" id="inter_image_html" name="inter_image_html" size="12" <?php if (isset($randomimage_options["inter_image_html"])) print "value='" . stripslashes(htmlspecialchars($randomimage_options["inter_image_html"], ENT_QUOTES)) . "'"; ?>/> e.g. <code style="font-weight:bold;"><br /><br /></code></div>
</div>
<div style="clear: both;padding-top:10px;">
<label style="float:left;width:250px;text-align:right;padding-right:6px;padding-top:7px;" for="image_attributes">Optional attributes for <code><img></code> tags:</label>
<div style="float:left;"><input type="text" id="image_attributes" name="image_attributes" style="width:200px;" <?php if ($randomimage_options["image_attributes"]) print "value='" . stripslashes(htmlspecialchars($randomimage_options["image_attributes"], ENT_QUOTES)) . "'"; ?>/> e.g. <code style="font-weight:bold;">style="width:200px;"</code></div>
</div>
<div style="clear: both;padding-top:10px;">
<label style="float:left;width:250px;text-align:right;padding-right:6px;padding-top:7px;">Limit by categories/tags:<br />(leave unchecked for all)</label>
<div style="float:left;">
<div style='overflow:auto;height:6em;width:200px;background-color:#efefef;border:1px solid #b2b2b2;padding:2px 0 0 3px;'>
<?php
// create WordPress-style category multi-select list
global $wpdb, $wp_version;
if ($wp_version >= '2.3') {
$categories = $wpdb->get_results("SELECT $wpdb->terms.term_id as cat_ID, $wpdb->terms.name as cat_name
FROM $wpdb->terms LEFT JOIN $wpdb->term_taxonomy on $wpdb->terms.term_id = $wpdb->term_taxonomy.term_id
WHERE $wpdb->term_taxonomy.taxonomy IN ('post_tag', 'category')
ORDER BY $wpdb->terms.name");
} else {
$categories = $wpdb->get_results("SELECT cat_ID, cat_name
FROM $wpdb->categories
ORDER BY cat_name");
}
foreach ($categories as $category) {
print "<label style='display:block;' for='category-$category->cat_ID'><input type='checkbox' value='$category->cat_ID' name='category_filter[]' id='category-$category->cat_ID'" . (in_array( $category->cat_ID, $randomimage_options["category_filter"] ) ? ' checked="checked"' : "") . " />" . wp_specialchars($category->cat_name) . "</label>\n";
}
?>
</div>
</div>
</div>
<div style="clear: both;padding-top:10px;">
<label style="float:left;width:250px;text-align:right;padding-right:6px;padding-top:7px;" for="image_class_match">String to match in the <code><img></code> <code>class</code>:</label>
<div style="float:left;"><input type="text" id="image_class_match" name="image_class_match" style="width:200px;" <?php if ($randomimage_options["image_class_match"]) print "value='" . stripslashes(htmlspecialchars($randomimage_options["image_class_match"], ENT_QUOTES)) . "'"; ?>/> e.g. <code style="font-weight:bold;">randomimage</code></div>
</div>
<div style="clear: both;padding-top:10px;">
<label style="float:left;width:250px;text-align:right;padding-right:6px;padding-top:7px;" for="image_src_regex">Regex to match against the <code><img></code> <code>src</code>:</label>
<div style="float:left;"><input type="text" id="image_src_regex" name="image_src_regex" style="width:200px;" <?php if ($randomimage_options["image_src_regex"]) print "value='" . stripslashes(htmlspecialchars($randomimage_options["image_src_regex"], ENT_QUOTES)) . "'"; ?>/> e.g. <code style="font-weight:bold;">images</code></div>
</div>
<div style="clear: both;padding-top:10px;text-align:center;">
<p class="submit"><input type="submit" name="submit" value="Update Options »" /></p>
</div>
</form>
</div>
<div class="wrap">
<h2>Sample Output</h2>
<?php randomimage(); ?>
</div>
<?php
}
function randomimage($show_post_title = true,
$number_of_images = 1,
$image_attributes = "",
$show_alt_caption = true,
$image_src_regex = "",
$post_type = "posts",
$inter_image_html = "<br /><br />",
$category_filter = "",
$sort_images_randomly = true,
$image_class_match = "",
$image_template_html = "",
$show_images_in_galleries = true)
{
// get access to wordpress' database object
global $wpdb, $wp_version;
$debugging = false;
if ($debugging) print "<strong>Random Image Debugging is On!</strong><br/>";
// if no arguments are specified
// assume we're going with the configuration options
if (!func_get_args()) {
if ($debugging) print "Configuration options (specified via admin interface):<br />";
$randomimage_options = get_randomimage_options();
$number_of_images = $randomimage_options['number_of_images'];
$image_attributes = $randomimage_options['image_attributes'];
$image_src_regex = $randomimage_options['image_src_regex'];
$inter_image_html = $randomimage_options['inter_image_html'];
$sort_images_randomly = $randomimage_options['sort_images_randomly'];
$image_class_match = $randomimage_options['image_class_match'];
$image_template_html = $randomimage_options['image_template_html'];
$show_images_in_galleries = $randomimage_options['show_images_in_galleries'];
// convert category filter array into a comma-separated list
if (!is_array($randomimage_options['category_filter'])) {
$randomimage_options['category_filter'] = array();
}
$category_filter = implode(",", $randomimage_options['category_filter']);
// galleries really only exist in posts
if ($show_images_in_posts == true && $show_images_in_pages == false) {
$post_type = "posts";
} elseif ($show_images_in_posts == false && $show_images_in_pages == true) {
$post_type = "pages";
} else {
$post_type = "both";
}
} else {
if ($debugging) print "Configuration options (specified via function parameters):<br />";
// if config options were specified via a function call, but no template was supplied,
// build a template from the show_post_title and show_alt_caption options.
if ($image_template_html == '') {
if ($show_post_title) {
$image_template_html .= "\n<strong>%1</strong><br />\n";
}
$image_template_html .= "%2";
if ($show_alt_caption) {
$image_template_html .= "<br />\n<em>%3</em>\n";
}
}
}
if ($debugging) {
print "show_post_title: " . htmlspecialchars($show_post_title) . "<br/>";
print "number_of_images: " . htmlspecialchars($number_of_images) . "<br/>";
print "image_attributes: " . htmlspecialchars($image_attributes) . "<br/>";
print "show_alt_caption: " . htmlspecialchars($show_alt_caption) . "<br/>";
print "image_src_regex: " . htmlspecialchars($image_src_regex) . "<br/>";
print "post_type: " . htmlspecialchars($post_type) . "<br/>";
print "inter_image_html: " . htmlspecialchars($inter_image_html) . "<br/>";
print "category_filter: " . htmlspecialchars($category_filter) . "<br/>";
print "sort_images_randomly: " . htmlspecialchars($sort_images_randomly) . "<br/><br/>";
}
// select the post_type sql for both post pages (post_status = 'static')
// and posts (AND post_status = 'publish')
// or for just pages or for just posts (the default)
// by adding this where criteria, we also solve the problem
// of accidentally including images from draft posts.
if ($wp_version < '2.1') {
if ($post_type == "both") {
$post_type_sql = "AND (post_status = 'publish' OR post_status = 'static')";
} else if ($post_type == "pages") {
$post_type_sql = "AND post_status = 'static'";
} else {
$post_type_sql = "AND post_status = 'publish'";
}
} else {
if ($post_type == 'both') {
$post_type_sql = "AND post_status = 'publish' AND post_type in ('post', 'page')";
} elseif ($post_type == 'pages') {
$post_type_sql = "AND post_status = 'publish' AND post_type = 'page'";
} else {
$post_type_sql = "AND post_status = 'publish' AND post_type = 'post'";
}
}
// assuming $category_filter is a comma separated list of category ids,
// modify query to join with post2cat table to select from only the chosen categories
$category_filter_join = "";
$category_filter_sql = "";
$category_filter_group = "";
if ($category_filter != "") {
if ($wp_version >= '2.3') {
$category_filter_join = "LEFT JOIN $wpdb->term_relationships ON $wpdb->posts.ID = $wpdb->term_relationships.object_id LEFT JOIN $wpdb->term_taxonomy ON $wpdb->term_relationships.term_taxonomy_id = $wpdb->term_taxonomy.term_taxonomy_id";
$category_filter_sql = "AND $wpdb->term_taxonomy.term_id IN ($category_filter)";
$category_filter_group = "GROUP BY $wpdb->posts.ID";
} else {
$category_filter_join = "LEFT JOIN $wpdb->post2cat ON $wpdb->posts.ID = $wpdb->post2cat.post_id";
$category_filter_sql = "AND $wpdb->post2cat.category_id IN ($category_filter)";
$category_filter_group = "GROUP BY $wpdb->posts.ID";
}
}
// by default we sort images randomly,
// but we can also sort them in descending date order
if ($sort_images_randomly) {
$order_by_sql = "rand()";
} else {
$order_by_sql = "$wpdb->posts.post_date DESC";
}
// query records that contain img tags, ordered randomly
// do not select images from password protected posts
$sql = "SELECT $wpdb->posts.ID, $wpdb->posts.post_title, $wpdb->posts.post_content, $wpdb->posts.post_excerpt
FROM $wpdb->posts
$category_filter_join
WHERE (post_content LIKE '%<img%' or post_content LIKE '%[gallery]%')
AND post_password = ''
$post_type_sql
$category_filter_sql
$category_filter_group
ORDER BY $order_by_sql";
$resultset = @mysql_query($sql, $wpdb->dbh);
if ($debugging && mysql_error($wpdb->dbh)) print "mysql errors: " . mysql_error($wpdb->dbh) . "<br/> SQL: " . htmlspecialchars($sql) . "<br/>";;
if ($debugging) print "elligible post count: " . @mysql_num_rows($resultset) . "<br/>";
// keep track of multiple images to prevent displaying dups
$image_srcs = array();
// loop through each applicable post from the database
$image_count = 0;
while ($row = mysql_fetch_array($resultset)) {
$post_title = $row['post_title'];
$post_permalink = get_permalink($row['ID']);
$post_content = $row['post_content'];
$post_excerpt = $row['post_excerpt'];
$matches = array();
// find all img tags
preg_match_all("/<img[^>]+>/i", $post_content, $matches);
if ($show_images_in_galleries) {
// find any gallery attachments
if (strpos($post_content, '[gallery]') !== false) {
$sql = "SELECT $wpdb->posts.guid, $wpdb->posts.post_excerpt
FROM $wpdb->posts
WHERE post_parent = '" . $row['ID'] . "'
AND post_type = 'attachment'
AND post_password = ''
AND post_mime_type in ('image/jpeg', 'image/gif', 'image/png')";
$resultset2 = @mysql_query($sql, $wpdb->dbh);
while ($row2 = mysql_fetch_array($resultset2)) {
$matches[0][] = "<img src='" . $row2['guid'] . "' alt='" . htmlspecialchars($row2['post_excerpt'], ENT_QUOTES) . "' />";
}
}
}
// if there are none, try again,
if (count($matches[0]) == 0) {
continue;
}
// randomize the array of images in this post
shuffle($matches[0]);
// loop through each image candidate for this post and try to find a winner
foreach ($matches[0] as $image_element) {
// grab the src attribute and see if it exists, if not try again
preg_match("/src\s*=\s*(\"|')(.*?)\\1/i", $image_element, $image_src);
$image_src = $image_src[2];
// make sure we haven't displayed this image before
if ($image_src == "" || in_array($image_src, $image_srcs)) {
continue;
}
// if a regex is supplied and it doesn't match, try next post
if ($image_src_regex != "" && !preg_match("/" . $image_src_regex . "/i", $image_src)) {
continue;
}
if ($image_class_match != "") {
// grab the class attribute and see if it exists, if not try again
preg_match("/class\s*=\s*(\"|')(.*?)\\1/i", $image_element, $image_classes);
$image_classes = $image_classes[2];
if ($image_classes == '') {
continue;
}
$image_classes = explode(" ", $image_classes);
if (!in_array($image_class_match, $image_classes)) {
continue;
}
}
// add img src to array to check for dups
$image_srcs[] = $image_src;
// grab the alt attribute and see if it exists, if not supply default
preg_match("/alt\s*=\s*(\"|')(.*?)\\1/i", $image_element, $image_alt);
$image_alt = $image_alt[2];
if ($image_alt == "") {
$image_alt = "random image";
}
$image_html = $image_template_html;
$image_html = str_replace("%1", $post_title, $image_html);
$image_html = str_replace("%2", "<a href='$post_permalink'><img src='$image_src' alt='$image_alt' $image_attributes /></a>", $image_html);
if ($image_alt == 'random image') {
$image_html = str_replace("%3", '', $image_html);
} else {
$image_html = str_replace("%3", $image_alt, $image_html);
}
$image_html = str_replace("%4", $post_excerpt, $image_html);
print $image_html;
$image_count++;
if ($image_count == $number_of_images) {
return;
} else {
// print a linebreak between each successive image
print "$inter_image_html\n";
}
// leave the foreach loop and look for images
// in other posts
// TODO: if people wanted to display multiple images per post,
// we would selectively skip this break
break;
}
}
}
?>
Grazie
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01-04-2011, 17:49
