add characters at certain spot

[docock]

Hi I want to add some characters at a given spot within a string.
Lets say my string is:

$image="images/fruit.jpg";

And I want to add: -2 just before the dot, so it becomes:
$image="images/fruit-2.jpg";

Which command or line do I need for this?
Thanks

[Eran]

if you know exactly where you want to put your string ("-2") then i would use substr_replace

if it isn't and you want it in a different character place then use preg_match

[mlseim]

Will it always be right before the dot?
And what you're adding changes each time?

[docock]

Yes it will allways be right before the dot, and -2 will be added (no other characters or numbers)

[ptmuldoon]

You may want to also consider the use strlen as well.

Is it possibly to have a file/image name that also a dot in it? ie $image="images/my.fruit.jpg";

Perhaps look to count the file name length, and then and a -2 from 4th character from the end?

Example:

$image="images/my.fruit.jpg";

echo $image .'<br/>';

$length = $image;
echo strlen($length) .'<br/>'; //19

$location = $length - 4;

echo substr_replace($image, '-2', $location, 0) . "<br />\n"; 

[Eran]

ptmuldoon:
you don't need the strlen function since you can use - sign.
that mean it counts from the end backwards or in your sample '-4'

Example:

$image="images/my.fruit.jpg";

echo $image .'<br/>';

$length = $image;
echo strlen($length) .'<br/>'; //19

$location = $length - 4;

echo substr_replace($image, '-2', $location, 0) . "<br />\n"; 

echo "we don't need strlen: " . substr_replace($image, '-2', -4, 0) . "<br />\n"; 

// the result for both is "images/my.fruit-2.jpg" 

[ptmuldoon]

Thanks Never crossed my mind to do it that way.

[Eran]

no problem :]