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Posted by kurrent on 10/18/06 00:58
Rik wrote:
> kurrent@gmail.com wrote:
> > i'm still new to php and programming and was hoping to get some help
> > on a few questions i haven't had success in answering myself. I
> > successfully created my first very simple script to accomplish a task
> > I wanted, but not completely. see my code below:
> >
> > <?php
> >
> > //my first ever php program simply designed to automatically adjust
> > new prices of my properties
> >
> > //current property prices
> > $prices = array('250000', '250000', '350000');
> >
> > //percentage of how much to add to current prices
> > $increase_rate = '0.015'; // 1.15 %
> >
> > //add new percentage to each price
> > foreach ($prices as &$newprice) {
> > $newprice = $newprice + ($newprice * $increase_rate);
> > }
> >
> > //print out all new prices
> > for ($key = 0; $key < 3; $key++) {
> > print "$prices[$key]<br />";
> > }
> >
> >>
> <pre>
> <?php
> $prices = array('250000', '250000', '350000');
> $increase_rate = '0.015';
>
> function increase_price(&$item,$key,$rate){
> $item = number_format(floatval(str_replace(',','',$item)) * (1 +
> $rate),0,'',',');
> }
> $oldprices = $prices;
> array_walk($prices,'increase_price',$increase_rate);
> $changes = array_map(null,$oldprices,$prices);
> print_r($changes);
> ?>
> </pre>
>
> > e.g. -> echo the following structure:
> > set an array of values, then do a function to
> > manipulate the values, then show the old
> > values in comparison of the new values
> > (basically, show that $253,750 used to be
> > $250,000)
>
> print_r() will show you the arrays, if it's just to check for the
> programmer, for a form/UI offcourse it will be better to give it some sort
> of layout, vprintf() is very handy for this.
>
> > 2.) a) What if i have commas in my prices by default?
> >
> > e.g. = array('349,502' '234,995');
>
> Removed by str_replace();
>
> > b) How would I go about processing comma values
> > received via a form that a user entered or from .CSV
> > file that looked like (132,500, 123,340, 345,959,
> > 244,459)?
>
> str_replace could be used for this, but if you're not absolutely sure about
> your data, I'd use $price = preg_replace('/[^0-9]/','',$price); (on the
> condition you never use decimals, otherwise you might want to use
> '/[^0-9\.]/' instead).
>
> > c) How would I add a comma into my printed outputed values?
>
> number_format(), or maybe in this case money_format();
>
> > 3.) There must be a better way to print out all the values
> > from an array but constructing a loop came to mind and
> > beats doing it one by one. Is there better way?
>
> Why not a foreach() loop there?
> Anyway, print_r() and var_dump() are your friends while building, for a
> form/html-page for other users you almost certainly will have to use a loop
> or a str_repeat()/vprintf() combo.
>
> Grtz,
> --
> Rik Wasmus
Thanks you very much for your detailed response Rik. You're
explanations are going to keep me busy tonight learning them throughly
and help me out a great deal in the process. Much appreciated for you
to take the time to answer these questions!
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