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the temporary directory used for storing files when doing file upload. must be writable by whatever user php is running as. if not specified php will use the system's default.
must be writable by whatever user php is running as.

ifx_byteasvarchar(1): return byte columns as if they were varchar columns, so that you don't need to use blob id's for select queries.
ifx_byteasvarchar( 1): return byte columns as if they were varchar columns, so that you don't need to use blob id's for select queries.

specifies the name of a file that is automatically parsed after the main file. the file is included as if it was called with the include() function, so include_path is used.
the file is included as if it was called with the include() function, so include_path is used.

a very common type of expressions are comparison expressions. these expressions evaluate to either 0 or 1, meaning false or true (respectively). php supports (bigger than), = (bigger than or equal to), == (equal), != (not equal), (smaller than) and = (smaller than or equal to). these expressions are most commonly used inside conditional execution, such as if statements.
post-increment, which is written '$variable++' evaluates to the original value of $variable, before it was incremented (php increments the variable after reading its value, thus the name'post-increment').