Replace last occurence

[ntbgl]

I have a string like this:

$list="I would like to buy some apples, bannanas, pears, grapes."

What I would like to do is to take this string and replace the last occurance of "," with " and", to make the string look like this:

$list="I would like to buy some apples, bannanas, pears and grapes."

[tbarbedo]

here's a way to look at it...

split the every character in the string into an array.
count up how many ',' array values there are
find the position of the last ',' value and replace with " and"
then merge all the array values back into a string

[cameraman]

You could use a regular expression:
$newlist = preg_replace('#,(?![^,]+,)#',' and',$list);

The regular expression looks for a comma and uses a negative lookahead assertion to look for non-commas followed by a comma. Google "regex lookahead" for a more comprehensive explanation.

[VarX]

check this out is this what you need

<?php
$list="I would like to buy some apples, bannanas, pears, grapes." ;
#check the last occurence and replace the value;
$last=strripos($list,',');
$list_explode=str_split($list);
for ($i = 0; $i<=count($list_explode); $i++){
if ($i == $last){
$list_explode[$i] =' and';
}

}
$sorted = implode($list_explode,'');
echo $sorted;
?>

#echos I would like to buy some apples, bannanas, pears and grapes.

[edited by: VarX at 6:07 am (utc) on Feb. 20, 2009]

[dreamcatcher]

Something like this would also probably work:

$list="I would like to buy some apples, bannanas, pears, grapes.";
echo substr($list,0,strrpos($list,',')).' and '.substr(strrchr($list, ','), 1);

dc

[whoisgregg]

Or something like this:

$list="I would like to buy some apples, bannanas, pears, grapes."; 
$result = strrev(implode(strrev(" and"), explode(",", strrev($list), 2)));

:)