[PHP-NOTES] note 130534 added to function.getopt

While better than previously thanks to the rest_index parameter, be aware that the implementation follows the posix style, and is limited compared to what you might be used to with similar functionality in environments such as bash and python using argpase(). 

argv related variables are not modified, so the options remain and need to be skipped, and options cannot appear after positional parameters. 

Thus after parsing with a spec of "Ex:"

-E -x foo bleh

bleh will appear at $argv[4], not $argv[1] as in typical modern implementations

and 

-x foo bleh -E

would recognise -x but not -E, again unlike modern getopt implementations.

Rather than adding $rest_index, it's a shame that an option to use more flexible and friendly GNU style parsing to be consistent with other systems wasn't added instead, such as taking a $argv array by reference that was modified and enabled GNU behaviour.
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