Category Archives: php

Fixing a Problem with WordPress Trackbacks and Pingbacks

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Trackbacks and pingbacks stopped working on several of my blogs. It turned out to be quite time consuming figuring out what was causing the problem. Eventually the following worked:

Installing php-xml

sudo apt-get install php-xml

And commenting out a check for empty $context variable (this doesn’t really make sense as the variable isn’t empty at this point but until it was commented out it just silently didn’t work) in the file wp-includes/class-wp-xmlrpc-server.php.

// if ( empty($context) ) // Link to target not found
// return $this->pingback_error( 17, __( 'The source URL does not contain a link to the target URL, and so cannot be used as a source.' ) );

Anyway if the initial steps you take to deal when trackbacks and pingbacks on your blog stop working you might want to try these steps that worked for me.

Related: Fix for When a WordPress Blog Stops Displaying Images – Compare WordPress Files on Server to Proper WordPress Version – WordPress: Multiple Blog Network on One Server โ€“ Overcoming Conflicts

WordPress error: Image could not be processed. Please go back and try again.

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If you get an error saying

Image could not be processed. Please go back and try again.

when you try to put a new custom header image for WordPress theme 2010 on a server using Ubuntu the following may help:

[bash]apt-get install php5-gd[/bash]
once it installs then
[code]invoke-rc.d apache2 restart[/code]

This will provide php the ability to manipulate images that WordPress is trying to use.

Using Git and Github

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To download a repository hosted on github
[bash]git clone [email protected]:account_name/repo_name.git[/bash]

The [email protected]:account_name/repo_name.git will be shown on the home page for the repository on github.com

To update your code from the master branch of the repo:

[bash]git pull origin master[/bash]

To commit the changes you have made locally:

[bash]git commit -m "the message explaining what these code changes did"[/bash]

To send your changes to the repo at github:
[bash]git push origin master[/bash]

Code to Display text only on WordPress Blog Home Page

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Cut and past php code to determine if it is the wordpress blog home page (and only the home page itself).

[php]<?php if (is_home() && !is_paged()): ?>[/php]

Example, to print john if it is a “homepage” templated page and jill otherwise:

[php]<?php if (is_home(); ?>

<?php
if($name == ‘john’){
echo ‘Hi John’;
}else if($name == ‘jill’){
echo ‘Hi Jill’;
}else{
echo ‘Hi’;
}
?>[/php]