Hi Rob,
Thanks again, you are a gem. I would spend the rest of
the day going over the breakdown to get a better
understanding of the script. I really appreciate your
help. Have a nice day and a wonderful weekend. Again,
thank you very much.
Robert
--- "Atkinson, Robert" <ratkinson@xxxxxxxxxxxxx>
wrote:
> Breakdown of script :-
>
>
> // We need to know how many rows there are in the
> '$rows' array,
> // so we can loop through each one looking at all of
> the values,
> // which is held in $max_rows
>
> $max_rows = count($rows);
>
> // Firstly, we loop around every instance of $rows,
> using 'foreach'.
> // The key to the $rows array, i.e. 0, 1, 2, 3, etc
> is loaded into
> // $array_key and the value is loaded in
> $array_value.
> //
> // Remember that $array_value is an array itself,
> but PHP
> // is quite happy with this as it is a 'loosely
> typed' language, so
> // you can load any type of value into any variable
> //
> // There are 2 loops going on in the code, one to
> take us through each
> // row as a main loop, and another to go back
> through all the rows at the
> // time, comparing the row to all of the other rows
> //
> // If we were to look inside the loops, we would see
> something like this :-
> //
> // MAIN LOOP SUB-LOOP
> // current row -> compare to
> // 0 1
> // 0 2
> // 0 3
> // 1 0
> // 1 2
> // 1 3
> // 2 0
> // 2 1
> // 2 3
> // 3 0
> // 3 1
> // 3 2
> //
> // Notice that we never compare the current row to
> itself, we simply
> // step over it
> //
>
> foreach ($rows as $array_key => $array_value) {
>
> // lets output a message to say which array row
> we're currently
> working on
> // We know which one it is, because we loaded that
> information in
> // $array_key, i.e. 0, 1, 2, etc
>
> echo "<br>Curr row = " . $array_key . " - <br>\n";
>
> // Now the good bit
> // We have to loop round all of the rows (in $rows)
> independently of
> the loop
> // we're doing in our 'foreach' above, but we must
> not compare the
> row to
> // inself
> //
> // First of all, we set a counter, called $i, to
> zero
> // We keep looping round until we get to the end of
> the rows, by
> looking at
> // the value of $max_rows
>
> for ($i = 0; $i < $max_rows; $i++) {
>
> // In this statement we check to see if the row
> we're
> currently
> // checking in our 'for' loop, is the same row as
> the row
> we're on
> // in our 'foreach' loop. Remember, we must not
> compare a row
> to itself
>
> if ($array_key <> $i) {
>
> // Compare the elements in $array_value, which
> holds
> the current
> // $rows array to the current $rows in our 'for'
> loop, and store the results
> // in $common
>
> $common = array_intersect($array_value,
> $rows[$i]);
>
> // Loop round each of the matching values, in
> $common, and output them
>
> foreach ($common as $key => $value) {
> echo "Key: $key; Value: $value\n";
> }
> echo "<BR>";
> }
> }
> }
>
> -----Original Message-----
> From: php-objects@xxxxxxxxxxxxxxx
> [mailto:php-objects@xxxxxxxxxxxxxxx] On
> Behalf Of Robert Barker
> Sent: 17 January 2008 18:11
> To: php-objects@xxxxxxxxxxxxxxx
> Subject: RE: HOW DO I CREATE A LOOP
> CRAWLER?
>
> EXCELLENT WORK ROB. THANK YOU VERY MUCH.
>
>
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