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Files and related
Everything related to file manipulation, directories and more is in here.
Miscellaneous
If it doesn't fit in any other category, it will be in here.
Algorithms
There are all kinds of algorithms in PHP. Find some in here!
Strings & Regular Expressions
Regular expressions and string functions can be found in this category.
Date/Time Functions
All the functions that are related to date/time manipulation can be found right here!