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Posted by Rik on 10/17/06 23:43
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
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