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< title > Dividing Drupal' s process and preprocess functions into separate files | Oliver Davies< / title >
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< h1 > Dividing Drupal' s process and preprocess functions into separate files< / h1 >
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< p class = "posted text-light" > 24th May 2012< / p >
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< p > If you use a lot of process and preprocess functions within your Drupal theme, then your template.php can get very long and it can become difficult to find a certain piece of code. Following the example of the < a href = "http://drupal.org/project/omega" title = "The Omega theme on Drupal.org" > Omega theme< / a > , I've started separating my process and preprocess functions into their own files. For example, mytheme_preprocess_node can be placed within a preprocess/node.inc file, and mytheme_process_page can be placed within process/page.inc.< / p >
< p > The first step is to use the default mytheme_process() and mytheme_preprocess() functions to utilise my custom function. So within my template.php file:< / p >
< pre > < code class = "language-php" > < ?php
/**
* Implements hook_preprocess().
*
* Initialises the mytheme_invoke() function for the preprocess hook.
*/
function mytheme_preprocess(& $variables, $hook) {
mytheme_invoke('preprocess', $hook, $variables);
}
/**
* Implements hook_process().
*
* Initialises the mytheme_invoke() function for the process hook.
*/
function mytheme_process(& $variables, $hook) {
mytheme_invoke('process', $hook, $variables);
}
< / code > < / pre >
< p > Now, to write the < code > mytheme_invoke()< / code > function:< / p >
< pre > < code class = "language-php" > < ?php
/**
* Invokes custom process and preprocess functions.
*
* @param string $type
* The type of function we are trying to include (i.e. process or preprocess).
*
* @param array $variables
* The variables array.
*
* @param string $hook
* The name of the hook.
*
* @see mytheme_preprocess()
* @see mytheme_process()
*/
function mytheme_invoke($type, $hook, & $variables) {
global $theme_key;
// The name of the function to look for (e.g. mytheme_process_node).
$function = $theme_key . '_' . $type . '_' . $hook;
// If the function doesn't exist within template.php, look for the
// appropriate include file.
if (!function_exists($function)) {
// The file to search for (e.g. process/node.inc).
$file = drupal_get_path('theme', $theme_key) . '/' . $type . '/' . $type . '-' . str_replace('_', '-', $hook) . '.inc';
// If the file exists, include it.
if (is_file($file)) {
include($file);
}
}
// Try to call the function again.
if (function_exists($function)) {
$function($variables);
}
}
< / code > < / pre >
< p > As < code > mytheme_invoke()< / code > checks to see if the function already exists before searching for checking the include files, I could still add the functions into template.php as normal and this would override any corresponding include file.< / p >
< p class = "tags" >
Tags:
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< a href = "https://www.oliverdavies.uk/blog/tags/drupal" > drupal< / a > , < a href = "https://www.oliverdavies.uk/blog/tags/code" > code< / a > , < a href = "https://www.oliverdavies.uk/blog/tags/theming" > theming< / a > , < a href = "https://www.oliverdavies.uk/blog/tags/preprocessing" > preprocessing< / a > < / p >
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< p > Oliver Davies is a Web Developer, System Administrator and Drupal specialist based in the UK. He is a Senior Developer at < a href = "https://microserve.io" > Microserve< / a > and also provides freelance consultancy services for Drupal websites, PHP applications and Linux servers.< / p >
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