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Sending data from php to javacript in WordPress

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It is often useful to send data from PHP to Javascript and WordPress gives you a method.

You can use the localise script function to send data from php to javascript in WordPress coding

e.g.

and access it in your javascript thus  e.g.

The localisation needs to be called after the script is enqueued. This is useful method to pass static option data through.
However it doesn’t work if you need data from the wordpress loop after the </head> tag is closed
so you need to use this style

 

When working out what is going on in WordPress

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it is sometimes useful to be able to see what globals exist.

This snippet of code shows globals and excludes a couple of the big wordpress objects that probably are not of any use

[php]

foreach ($GLOBALS as $key => $value) {
if (($key!=’GLOBALS’) && ($key!=’wp_object_cache’) && ($key!=’wp_filter’)){
if ((!is_object($value)) && (!is_array($value))) {
echo "key= ".$key. " value= ".$value."<br>";
} else {
echo "key= ".$key." .. array/object <br>";
print_r($value);
echo "<br>… end array/object <br>";
}
}
}

[/php]
The code displays objects and arrays too. just add $ to the key to get the global and use it in your wordpress theme code.
This is advanced investigation into what WordPress is doing, when examining complex plugins and themes. This is not for beginners, but for wordpress developers.

Moving WordPress Server

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This is really just a quick note. Much can be found on WordPress codex describing the steps when moving server, but this one caught me out.

I decided that I would move all my wordpress sites off my shared hosting reseller account to a VPS (Virtual Private Server).

As I had paid for WHM/Cpanel, it was fairly easy. I am actually glad I did, despite having been a professional unix system admin before the days of WHM/Cpanel it doesn’t half make things easy.

Anyway, all my accounts (about 8 sites) moved across easily then their was the inevitable one that ‘white screened’. So I spent a good hour or so,  recopying, checking it worked on the original reseller account, updating wordpress and the plugins to the latest and re-copying.

Then when it still wouldn’t work, I finally resorted to checking the php,ini settings.  And there is was,  memory_limit on my Reseller was set to 64Mb and the default set up on my VPS was only 32Mb. A few seconds to mak ethe change and all was well. memory_limit is there to control badly written scripts from grabbing all the server memory, however 32Mb is sometimes too small for WordPress with premium themes and some bigger plugins.

Moral of the story, check your php.ini settings when moving server.

If you don’t know how, here is a simple way, create a file called phpinfo.php and add the following

[php]

<?php phpinfo(); ?>

[/php]

upload it to you web root and run it e.g. www.mydomain.com/phpinfo.php

This site is proudly powered by WPMU DEV

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Ozh’ Admin Drop Down Menu – CSS fix for WordPress 3.2.2

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Ozh’ Admin Drop Down Menu plugin for wordpress is a great plugin which give you a top menu version for admin navigation.

See http://planetozh.com/blog/my-projects/wordpress-admin-menu-drop-down-css/

However whilst implementing in WordPress 3.2.2  I found an issue with the ability to hide the original wordpress top menu. A fetaure that was previously working.

I worked out these CSS changes to sort that out.  the file to modify is wp-content/plugins/ozh-admin-drop-down-menu/inc/adminmenu.css.php



Around line 308 you will find

[php]
<!–?php if ($minimode) { ?–>
/* Hide all header */
#wphead {display:none;}
<!–?php } ?–>
[/php]

replace that with

[php]
<!–?php if ($minimode) { ?–>
/* Hide all header */
#wpadminbar, #wpadminbar * {display:none;}
body.admin-bar #wpcontent {padding-top: 0px;}
#ozhmenu {padding-top: 7px;}
<!–?php } ?–>
[/php]

That works for me on WordPress 3.2.2 of course future or earlier versions this may not work.
Hope that helps

Adding Breadcrumbs to WordPress

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I came across a very useful bit of code for adding breadcrumbs to WordPress without a plugin at http://dimox.net/wordpress-breadcrumbs-without-a-plugin/

There was a small bug in the code where is search returnd anything but a standard post (e.g. a page or custom post type) the search breadcrumb didn’t work.  The code below is the modification to correct that issue.   For installation instructions (basically put it in your themes functions.php)  and any other issues with the code please refer back to the original blog  here http://dimox.net/wordpress-breadcrumbs-without-a-plugin/

[php]
/* breadcrumbs from http://dimox.net/wordpress-breadcrumbs-without-a-plugin/ */
/* is_search position modified */
function dimox_breadcrumbs() {

$showOnHome = 0; // 1 – show breadcrumbs on the homepage, 0 – don’t show
$delimiter = ‘»’; // delimiter between crumbs
$home = ‘Home’; // text for the ‘Home’ link
$showCurrent = 1; // 1 – show current post/page title in breadcrumbs, 0 – don’t show
$before = ‘<span class="current">’; // tag before the current crumb
$after = ‘</span>’; // tag after the current crumb

global $post;
$homeLink = get_bloginfo(‘url’);

if (is_home() || is_front_page()) {

if ($showOnHome == 1) echo ‘</pre>
<div id="crumbs"><a href="’ . $homeLink . ‘">’ . $home . ‘</a></div>
<pre>’;

} else {

echo ‘</pre>
<div id="crumbs"><a href="’ . $homeLink . ‘">’ . $home . ‘</a> ‘ . $delimiter . ‘ ‘;

if ( is_category() ) {
global $wp_query;
$cat_obj = $wp_query->get_queried_object();
$thisCat = $cat_obj->term_id;
$thisCat = get_category($thisCat);
$parentCat = get_category($thisCat->parent);
if ($thisCat->parent != 0) echo(get_category_parents($parentCat, TRUE, ‘ ‘ . $delimiter . ‘ ‘));
echo $before . ‘Archive by category "’ . single_cat_title(”, false) . ‘"’ . $after;

} elseif ( is_search() ) {
echo $before . ‘Search results for "’ . get_search_query() . ‘"’ . $after;

} elseif ( is_day() ) {
echo ‘<a href="’ . get_year_link(get_the_time(‘Y’)) . ‘">’ . get_the_time(‘Y’) . ‘</a> ‘ . $delimiter . ‘ ‘;
echo ‘<a href="’ . get_month_link(get_the_time(‘Y’),get_the_time(‘m’)) . ‘">’ . get_the_time(‘F’) . ‘</a> ‘ . $delimiter . ‘ ‘;
echo $before . get_the_time(‘d’) . $after;

} elseif ( is_month() ) {
echo ‘<a href="’ . get_year_link(get_the_time(‘Y’)) . ‘">’ . get_the_time(‘Y’) . ‘</a> ‘ . $delimiter . ‘ ‘;
echo $before . get_the_time(‘F’) . $after;

} elseif ( is_year() ) {
echo $before . get_the_time(‘Y’) . $after;

} elseif ( is_single() && !is_attachment() ) {
if ( get_post_type() != ‘post’ ) {
$post_type = get_post_type_object(get_post_type());
$slug = $post_type->rewrite;
echo ‘<a href="’ . $homeLink . ‘/’ . $slug[‘slug’] . ‘/">’ . $post_type->labels->singular_name . ‘</a> ‘ . $delimiter . ‘ ‘;
if ($showCurrent == 1) echo $before . get_the_title() . $after;
} else {
$cat = get_the_category(); $cat = $cat[0];
echo get_category_parents($cat, TRUE, ‘ ‘ . $delimiter . ‘ ‘);
if ($showCurrent == 1) echo $before . get_the_title() . $after;
}

} elseif ( !is_single() && !is_page() && get_post_type() != ‘post’ && !is_404() ) {
$post_type = get_post_type_object(get_post_type());
echo $before . $post_type->labels->singular_name . $after;

} elseif ( is_attachment() ) {
$parent = get_post($post->post_parent);
$cat = get_the_category($parent->ID); $cat = $cat[0];
echo get_category_parents($cat, TRUE, ‘ ‘ . $delimiter . ‘ ‘);
echo ‘<a href="’ . get_permalink($parent) . ‘">’ . $parent->post_title . ‘</a> ‘ . $delimiter . ‘ ‘;
if ($showCurrent == 1) echo $before . get_the_title() . $after;

} elseif ( is_page() && !$post->post_parent ) {
if ($showCurrent == 1) echo $before . get_the_title() . $after;

} elseif ( is_page() && $post->post_parent ) {
$parent_id = $post->post_parent;
$breadcrumbs = array();
while ($parent_id) {
$page = get_page($parent_id);
$breadcrumbs[] = ‘<a href="’ . get_permalink($page->ID) . ‘">’ . get_the_title($page->ID) . ‘</a>’;
$parent_id = $page->post_parent;
}
$breadcrumbs = array_reverse($breadcrumbs);
foreach ($breadcrumbs as $crumb) echo $crumb . ‘ ‘ . $delimiter . ‘ ‘;
if ($showCurrent == 1) echo $before . get_the_title() . $after;

} elseif ( is_tag() ) {
echo $before . ‘Posts tagged "’ . single_tag_title(”, false) . ‘"’ . $after;

} elseif ( is_author() ) {
global $author;
$userdata = get_userdata($author);
echo $before . ‘Articles posted by ‘ . $userdata->display_name . $after;

} elseif ( is_404() ) {
echo $before . ‘Error 404’ . $after;
}

if ( get_query_var(‘paged’) ) {
if ( is_category() || is_day() || is_month() || is_year() || is_search() || is_tag() || is_author() ) echo ‘ (‘;
echo __(‘Page’) . ‘ ‘ . get_query_var(‘paged’);
if ( is_category() || is_day() || is_month() || is_year() || is_search() || is_tag() || is_author() ) echo ‘)’;
}

echo ‘</div>
<pre>’;

}
} // end dimox_breadcrumbs()
[/php]