how to remove chars into a string?

Question

I have a lot of strings, and I need to delete '0' at start of string, but what is the better way to do it, because this is an example of strings:

0130799.jpg //I need to get 130799
0025460.jpg //I need to get 25460

Now, I'm using substr function, but I think it's more efficient if I'll use Regex no ?

As to the efficiency of a regex over another method see: http://stackoverflow.com/questions/3303355/substring-match-faster-with-regular-expression — Kevin Burton, Jul 13 '11 at 07:22

score 11 · Accepted Answer · answered Jul 13 '11 at 07:17

11

just type cast will do it efficiently

echo (int) $var;

answered Jul 13 '11 at 07:17

Shakti Singh

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Indeed, it was easy ! Thank you so much ! – bahamut100 Jul 13 '11 at 07:21

score 3 · Answer 2 · answered Jul 13 '11 at 07:18

3

If the format is the same for all strings ([numbers].jpg), you could do:

intval('0130799.jpg', 10);

intval() in Manual

answered Jul 13 '11 at 07:18

kapa

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Ray Toal · Answer 3 · 2011-07-13T07:53:24.467

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If you use substr you have to use it in conjunction with strpos because substr needs to know string indexes.

Yes, you are better off with a regex.

If your question is how to extract the digits from a string 00000ddddddd.jpg (for some number of zeros and non-zero digits) anywhere in a string, then you should use preg_match.

Here is a complete example which you can try on http://writecodeonline.com/php/

preg_match('/([1-9][0-9]+)\.jpg/', "I have a file called 0000482080.jpg somewhere", $matches);
echo "I like to call it: {$matches[0]}";

If the entire string is a filename, then use intval or casting as suggested in the other answers.

edited Jul 13 '11 at 07:53

answered Jul 13 '11 at 07:21

Ray Toal

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This way is ok for "000AA00" string ? "AA00" in result ? – bahamut100 Jul 13 '11 at 07:39
Oops! Good catch. I edited my answer so that it does not pick up leading zeros. So sorry. – Ray Toal Jul 13 '11 at 07:42

stema · Answer 4 · 2011-07-13T07:51:39.520

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With a regular expression you can just do

preg_replace('/^0+/m','',$sourcestring);

^ is the start of the string (here with the m modifier the start of a row)

0+ means 1 or more zeros.

This regex will match all leading zeros and replace with an empty string.

See it here on Regexr

edited Jul 13 '11 at 07:51

answered Jul 13 '11 at 07:32

stema

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As say to Ray Toal answer : This way is ok for "000AA00" string ? "AA00" in result ? – bahamut100 Jul 13 '11 at 07:40
@bahamut100 I added a link to a regex test tool where you can see it. Yes it will also remove the leading 0 from "000AA00", is it this what you want? – stema Jul 13 '11 at 07:52

how to remove chars into a string?

4 Answers4