Disable

To disable is to prevent a feature to perform. For example, using disable_functions=foo prevents the function foo to be available at the start of execution, even if PHP has a definition for it. The function foo is cannot be run anymore, unless defined again.

Another example is memory_limit=-1, which sets the maximum memory used by a PHP application to -1, effectively disabling the control of the maximum amount of used memory.

Putting a piece of code in a comment is a way to disable it: it cannot be run anymore.

To disable implies a permanant state: it is different from a conditional statement.

Related : Enable, Disable Functions