Overrides built-in functions by replacing them in the symbol table.
Parameters
function_name
The function to override.
function_args
The function arguments, as a coma separated string.
Usually you will want to pass this parameter, as well as the
function_code
parameter, as a single quote
delimited string. The reason for using single quoted strings, is to
protect the variable names from parsing, otherwise, if you use double
quotes there will be a need to escape the variable names, e.g.
\$your_var.
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