String minus plus etc

String minus plus

[bono]

Hi guys, Im lookin at some interesting string manipulation.. and im new to this so havnt really a clue.. does this look right?

function edit_firmness($itemid,$firmness)
{ //changes an items firmness rating
$itemidlength = strlen($itemid);
$curfirmlength = strlen($itemfirmness[$itemid]);
$finstringlength = $itemidlength - $curfirmlength -1;
$newitemid =substr($itemid, 0, $finstringlength);
$this->itemid = $newitemid;

}

[mcibor]

First of all you don't have
$itemfirmness
defined, therefore
$curfirmlength = strlen($itemfirmness[$itemid]);
equals 0
Therefore you get $itemid without last letter.

To do that I recommend using to full extent function substr:

function edit_firmness($itemid,$firmness)
{ //changes an items firmness rating
$cut = strlen($itemfirmness[$itemid]) * (-1);
$newitemid =substr($itemid, 0, $cut);
$this->itemid = $newitemid;

}

It's not very correct, but a bit shorter.

I still have no idea what your function does
Michal Cibor

[bono]

all it does is change the firmness of a porduct in somebodys basket...eg

KN-STD-KI-1 - Standard King Size 1 £459.00

so my function changes the 1's to say 3's

KN-STD-KI-3 - Standard King Size 3 £459.00

[bono]

still cant get it to work.. anyone else got a clue?

[mcibor]

So you've got a string: 3 words + 1 word to change + some words?

function change_word($str, $to, $which) {
$array = explode(" ", $str);
$array[$which] = $to;
return implode(" ", $array);
}

To change fourth word:
$str = "Standard King Size 1 £459.00";
$str3 = change_word($str, "3", 3);
//$str3 = "Standard King Size 3 £459.00";

Best regards
Michal Cibor