Manual

36.7
Variables

The following options pertain to variable binding.

Variable options
Figure 36.34:  Variable options
3.0+When binding variables, expand values immediately (System)
Server script name: OPT_VARIABLE_IMMEDIATE_BINDING

When a set of variable bindings is pushed onto a variable stack, any additional variable references in the values of these variables can either be expanded immediately, or the values can be left unchanged to be expanded lazily as needed. This is explained in detail in section 7.7.

For immediate expansion turn this option on, for lazy expansion turn it off.

3.0+Fall back to lazy binding if immediate binding fails (System)
Server script name: OPT_VARIABLE_LAZY_FALLBACK

Old tests that rely on lazy variable binding may fail with the new default of immediate binding. If this option is activated, variables that cannot be bound immediately due to references to not-yet-defined variables are bound lazily instead and a warning is issued. To get rid of the warning simply change the value of the respective variable to use explicit lazy binding with '$_'. Please see section 7.7 for further information.

Furthermore, various kinds of variables can be defined here. These are explained in chapter 7.