How to trim string of all characters except integers in PHP

Question

I have a collection of possible sizes that I would like to trim, see as follows:

quantity_c_size_12_chain

quantity_c_size_12

quantity_size_12_chain

quantity_size_12

quantity_c_size_12_con_c

quantity_c_size_12_con_b

I would like to trim the string of all characters except the integer (in this example, 12)

At the moment I have this:

$size = preg_replace('#\d.*$#', '', $_GET['size']);

Unfortunately this does just the opposite of what I need, it strips the integer from the string and retains the alpha characters i.e. quantity_size_

Can anybody tell me what I need to do to remove everything except the integer?

Thanks,

Is it always string and number seperate with _ (underscore) symbol then try explode() with _ and then find is_numeric () then take it out, And you can use easly @dikesh answer. — Puttu, Apr 15 '14 at 11:03

score 1 · Answer 1 · edited May 23 '17 at 12:21

1

Try below: Reference

$str = 'quantity_size_12_chain';
preg_match_all('!\d+!', $str, $matches);
print_r($matches);

edited May 23 '17 at 12:21

Community

answered Apr 15 '14 at 11:01

Rahul Kaushik

score 1 · Accepted Answer · answered Apr 15 '14 at 11:13

1

$size = preg_replace("/\D+/", '', $_GET['size']);

where \D are non-digits, as opposed to \d

answered Apr 15 '14 at 11:13

mpapec

score 0 · Answer 3 · answered Apr 15 '14 at 11:04

0

$str = 'quantity_c_size_12_chain';
$new_str = preg_replace('/[^0-9]/','',$str);

answered Apr 15 '14 at 11:04

dikesh

Is it so difficult to understand? – dikesh Apr 15 '14 at 12:05
Probably not, but in order to be a quality answer it should be at least minimally explained. – nKn Apr 15 '14 at 12:06

3 Answers3