(string) requireZendLoader ()
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Detect and return the path to current Zend loader class.
Starting from ZF 0.9.0 autoloading function has been moved
from Zend.php to Zend/Loader.php class.
Starting from ZF 1.0.0 Zend.php class no longer exists.
This function tries to detect whether Zend_Loader exists
and returns its path if yes.
If the first step fails, the class will try to find Zend.php library
available in ZF <= 0.9.0 and returns its path if its exists.
If neither Zend/Loader.php nor Zend.php exists,
then this function will raise a sfConfigurationException exception.
returns Path to default Zend Loader class
throws sfConfigurationException
