[RESOLVED] How do I show only numbers in a string?

RonB

How do I show only numbers in a string?

I keep getting a string with a vertical tab, new line, and white space. But I don't know how to get rid of it. 🙁

I tried this, but it didn't work either.

$value = rtrim($str, "\t\n\x0B");

Is there a function that will only show numbers?

~Ron

laserlight

[man]preg_replace/man could come in handy here, e.g.,

$value = preg_replace('/\D/', '', $str);

RonB

Yes, thanks! It worked! But what was wrong with my rtrim() function?

ManWithNoName

I do not know exactly where in the text you have those numbers of yours but
This function returns a string with white space stripped from the end of str.

And, the second parameter is in your case superfluous.

And you have separated them wrong, you separate the with .. (double dots)

(http://se2.php.net/manual/en/function.rtrim.php)

laserlight

But what was wrong with my rtrim() function?

As ManWithNoName pointed out, the first thing wrong is that it only removes the characters from the right side of the string. As such, rtrim(), ltrim() and even trim() are unsuitable for your purpose. The next thing wrong is that it removes based on a specific list of characters, but your intention is to only allow another specific list of characters (i.e., the numerals in base 10). As such, you should remove all characters that are not in your specific list of characters.

And you have separated them wrong, you separate the with .. (double dots)

RonB's syntax is "correct" in that it specifies that "\t", "\n" and "\x0B" are to be trimmed. The .. is used to specify a range of characters.

ManWithNoName

The .. is used to specify a range of characters.
Thanks for pointing it out ... I will read the manual more carefully next time.