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Returns an array with the name of the defined classes
(PHP 4, PHP 5)
Return ValuesReturns an array of the names of the declared classes in the current script.
Note:
In PHP 4.0.1, three extra classes are returned at the beginning of
the array: Also note that depending on what extensions you have compiled or loaded into PHP, additional classes could be present. This means that you will not be able to define your own classes using these names. There is a list of predefined classes in the Predefined Classes section of the appendices. ExamplesExample 378. get_declared_classes() example<?phpThe above example will output something similar to: Array
See Also
Related 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 |
