gistfile1.sh

cmd -a -b -c // Single letter flags

cmd -abc // Same as above

gistfile2.sh

cmd -a foobar.jpg -bc

gistfile3.sh

cmd --some-flag
cmd --another-flag=charlie // You can use an equal sign
cmd --another-flag charlie // Or not. It's up to you.

gistfile4.sh

cmd -ab --bigflag=foo -c bar apricot orange

gistfile5.php

<?PHP
    $args = new Args();

    if($args->flag('a'))
        // -a was set, so do something

    if($args->flag('bigflag') == 'foo')
        // --bigflag was set to 'foo'

    foreach($args->args as $arg)
        // Do something with each argument.
        // Args will be bar, apricot, and orange.