How to count the number of times a "number" appears in string using php?

Question

I am trying to count how many times number appears in a string. For example, in the string "rt_876_io_542_po_367" there are three numbers and in the string "tr_766_ 756" there are two numbers. How do I do this with PHP?? I tried the following code:

        $str="RT_657_YT_89";
        $key=preg_match_all('!/_[0-9]_/!',$str);
        echo $key;

but it echos "0"!! please help

You tagged this with `preg_match`, so I'm assuming you at least know that you need to use a regex. Have you tried anything? — iainn, May 08 '18 at 10:52
Extract the numbers from string and count the `preg_match`'s result. — Praveen Kumar Purushothaman, May 08 '18 at 10:54
@iainn No need to, people will answer. Which doesn't help them really - teach a person to fish... — James, May 08 '18 at 10:56
@James That's a wrong intention. People spoonfed with answers will never learn. **Edit:** Sorry man. Good one. Didn't know you were writing it. Don't submit a comment without finishing it. — Praveen Kumar Purushothaman, May 08 '18 at 10:56
@PraveenKumar Sometimes, the Enter key is just too close to the other keys. — Mr Lister, May 08 '18 at 11:02
You can `$numbers = count(array_filter(explode('_', $str), function($v){return ctype_digit($v);}));` — MonkeyZeus, May 08 '18 at 13:28

score 1 · Answer 1 · answered May 08 '18 at 10:53

1

This can easily be accomplished with a regular expression.

function countDigits( $str )
{
    return preg_match_all( "/[0-9]/", $str );
}

The function will return the amount of times the pattern was found, which in this case is any digit.

answered May 08 '18 at 10:53

ThomasVdBerge

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@PraveenKumar The return value of `preg_match_all` *is* the count – iainn May 08 '18 at 10:56
@iainn Thanks. `:)` LoL. I forgot. – Praveen Kumar Purushothaman May 08 '18 at 10:59

How to count the number of times a "number" appears in string using php?

1 Answers1