func_get_arg() and func_get_args() functions in PHP
By: Marlin in PHP Tutorials on 2011-10-28
You may pass any number of extra parameters to a function, regardless of the prototyping. In addition, the arguments passed to a function will be available via the variable names defined in the function prototype, as well as via the func_get_arg() and func_get_args() functions.
For example:
function printme ($arg) {
for ($ndx = 0; $ndx < $num_args; ++$ndx)
$output .= func_get_arg ($ndx);
print $output;
}
printme ("one ", "two"); # This prints "one two"
This behavior is useful for setting default values for function arguments and for ensuring that a certain number of arguments get passed to a function.
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