The latest, and last, release of the Zend Framework 1.x series is just around the corner as ZF 1.12.0RC1 was announced this week. As I still have projects running ZF1 I thought about giving the most interesting new feature (for me) a spin - the new autoloaders which are backported from ZF2.
Note: the code below was updated to work with ZF 1.12.0RC2. Should still work with RC1, too.
I decided using the classmap autoloader as the main autoloader, and the good ol’ standard autoloader as the fallback autoloader. For the classmap autoloader to work we need to create a classmap. ZF1.12 comes with a tool, located in the
bin directory, called
classmap_generator.php, which will generate the classmap for us:
$ cd /path/to/project/library $ php /path/to/zf1.12/bin/classmap_generator.php
This will generate a PHP file called
autoload_classmap.php in the
library directory and it will have classname - filename mappings of the classes/files from that directory.
Next, need to change the
index.php a bit to tell ZF to use the new autoloaders:
<?php // normal setting up of APPLICATION_PATH and other constants here ... // Ensure library/ is on include_path set_include_path(implode(PATH_SEPARATOR, array( realpath(APPLICATION_PATH . '/../library'), get_include_path(), ))); require_once '../library/Zend/Loader/AutoloaderFactory.php'; // As of ZF1.12.0RC2 the Zend prefix is not autoregistered // with the standard autoloader, so we need to require explicitly // the ClassMapAutoloader.php require_once '../library/Zend/Loader/ClassMapAutoloader.php'; Zend_Loader_AutoloaderFactory::factory( array( 'Zend_Loader_ClassMapAutoloader' => array( __DIR__ . '/../library/autoload_classmap.php', __DIR__ . '/../application/autoload_classmap.php' ), 'Zend_Loader_StandardAutoloader' => array( 'prefixes' => array( 'Zend' => __DIR__ . '/../library/Zend' ), 'fallback_autoloader' => true ) ) ); // set up Zend_Application as normal here ...
and that’s about it - the autoloader will load classes from the classmaps, but if it fails to do so, it will fall back to the standard autoloader.
Stripping out require_once calls
The Zend Framework manual has a section on how to improve performance of the framework itself, and one of the suggestion is to strip out the
require_once calls from the library. I had to alter that find/sed command combination a bit in order to make it work with the classmaps:
$ find . -name '*.php' \ -not -wholename '*/Application.php' \ -not -wholename '*/Loader*' \ -print0 | xargs -0 \ sed --regexp-extended \ --in-place 's/(require_once)/\/\/ \1/g'
If I’m not wrong in reading my “debugging” echo statements, the standard autoloader gets called only once - to load the classmap autoloader itself - everything else is loaded via the classmaps. Pretty cool.