This class is used to classify the given file using some magic bytes characteristic to a particular file type. The classification information can be a MIME type or just text describing the file.

This method is slower than determining the type by file suffix but on the other hand reduces the risk of fail positives during the test.

The magic file consists of ASCII characters defining the magic numbers for different file types. Each row has 4 to 5 columns, empty and commented lines (those starting with a hash character) are ignored. Columns are described below.

• 1 -- byte number to begin checking from. ">" indicates a dependency upon the previous non-">" line
• 2 -- type of data to match. Can be one of following - byte (single character) - short (machine-order 16-bit integer) - long (machine-order 32-bit integer) - string (arbitrary-length string) - date (long integer date (seconds since Unix epoch/1970)) - beshort (big-endian 16-bit integer) - belong (big-endian 32-bit integer) - bedate (big-endian 32-bit integer date) - leshort (little-endian 16-bit integer) - lelong (little-endian 32-bit integer) - ledate (little-endian 32-bit integer date)
• 3 -- contents of data to match
• 4 -- file description/MIME type if matched
• 5 -- optional MIME encoding if matched and if above was a MIME type

• author: Sven Vollbehr <svollbehr@gmail.com>
• version: $Rev: 73 $
• copyright: Copyright (c) 2006-2008 PHP Reader Project Workgroup
• license: New BSD License

Located in /Magic.php (line 79)