The generated key_t value is obtained stat-ing the disk file corresponding to pathname in order to get its i-node number and the minor device number of the filesystem on which the disk file resides, then by combining the 8 bit proj value along with the lower 16 bits of the i-node number, along with the 8 bits of the minor device number. The algorithm does not guarantee a unique key value. In fact
Two different names linking to the same file produce same key values.
Using the lower 16 bits of the i-node number, gives some chance (also usually small) to have same key values for file names referring to different i-nodes.
lib/main.php:944: Notice: PageInfo: Cannot find action page