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Digg  get_declared_classes
Returns an array with the name of the defined classes
(PHP 4, PHP 5)
Example 378. get_declared_classes() example<?phpThe above example will output something similar to: ArrayRelated Examples ( Source code ) » get_declared_classes Examples ( Source code ) » get_declared_classes Code Examples / Notes » get_declared_classessmokey
you cannot remove them. they are "defined", which happens when the class is being loaded from the parser. you just deleted an instance of a class.
ben
To easily check the values, just run: print_r (get_declared_classes()); matt-php
The array returned by this function will be in the order the classes were defined / included / required and this order does not appear to change. For example: <?PHP //define classone class classone { } //define classtwo class classtwo { } //This will show X classes (built-ins, extensions etc) with //classone and classtwo as the last two elements print_r(get_declared_classes()); //define classthree class classthree { } //...and four class classfour { } //Shows the same result as before with class three and four appended print_r(get_declared_classes()); ?> Output: Array ( [0] => stdClass [1] .... other defined classes.... [10] => classone [11] => classtwo ) and... Array ( [0] => stdClass [1] .... other defined classes.... [10] => classone [11] => classtwo [12] => classthree [13] => classfour ) dexen + goofy _ pl
Summary: * in PHP 5.1 class names have case preserved * contrary, in PHP 4.4 class names are downcased, withe exception of a few build-in ones The get_declared_classes() funcition returns the list of names with case preserved, as of PHP 5.1 series (prolly 5.0 too, but i have no way to test it right now). Since PHP generally is caseless in regard to names of classes, this may come at a surprise. Also, this could potentially break older code asssuming downcased list. Take extra care when checking for existence of a class. Following example is, potentially, error prone: <?php in_array( $className, $classget_declared_classes() ) ?> A sure-fire (while slower) way would be to iterate over the array and normalize case to, say, lower: <?php $exists = FALSE; $className = strtolower( $className ); foreach ( get_declared_classes() as $c ) { if ( $className === strtolower( $c ) ) { $exists = TRUE; break; } }?> Optimization of the above snippet is left as a simple excercise to the reader ;) -- dexen deVries 22-mar-2005 05:16
Regarding note of 3-21: <?php class myclass {} $class = 'myclass'; $instance = new $class(); ?> This function could also be used to determine the names of classes defined in a particular file by calling it before and after include. It's hardly a pointless function. leigh purdie
Note that classes remain in the declared list, even when their associated object is undef'd. eg: $object = new MyClass; print_r(get_declared_classes()); undef($object); print_r(get_declared_classes()); - the two print_r's will return the same data. Not sure how to remove a class from the declared list. jazeps basko
In PHP5, you don't get declared interfaces by calling this function!!! To get interfaces you should use get_declared_interfaces(). However, to check if an interface is already defined, you should use class_exists()! This is strange, but PHP team does not think so. matt
classes can't be unloaded. probably not very practical to implement that in a future version. I wouldn't go out of my way to do it if I were zend. you're better off finding a workaround. it's better programming technique to find a way around having to do that anyway. http://www.zend.com/zend/week/week223.php#Heading10 |
