Output a string to error_log.

Output a string to local error_log.

Delete a variable.

Dump all variables.

Generate an error and stop execution.

Check if a class exist

Check if a function exist

Check if a method exist in a class

Check if a user function exist

Set return status code and stop.

Finish execution.

Return an array of all class currently defined.

Return an array of all system functions

Return an array of all method currently defined.

Return an array of all user functions

Push an existing pool or create a new one

Return the value of a variable

Replace current execution file.

Set current filename to process.

Sleep for a while

Stop execution.

Utility and exception functions