03-06-2011
This code does not look like Tcl. It looks more like Perl to me.
Anyway, the operation shift removes first entry from array, something like:
A[1]=A[2]; A[2]=A[3]; ...
so the code indeed can iterate over whole array, since every element end up as argv[1] at some point. Sh and perl programmers often do it this way.
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RESET(3) 1 RESET(3)
reset - Set the internal pointer of an array to its first element
SYNOPSIS
mixed reset (array &$array)
DESCRIPTION
reset(3) rewinds $array's internal pointer to the first element and returns the value of the first array element.
PARAMETERS
o $array
- The input array.
RETURN VALUES
Returns the value of the first array element, or FALSE if the array is empty.
EXAMPLES
Example #1
reset(3) example
<?php
$array = array('step one', 'step two', 'step three', 'step four');
// by default, the pointer is on the first element
echo current($array) . "<br />
"; // "step one"
// skip two steps
next($array);
next($array);
echo current($array) . "<br />
"; // "step three"
// reset pointer, start again on step one
reset($array);
echo current($array) . "<br />
"; // "step one"
?>
SEE ALSO
current(3), each(3), end(3), next(3), prev(3).
PHP Documentation Group RESET(3)