'How to find the first 4 digit number in a string?

Let's say I have a string:

 $string = "12, 123, 1234, 12345, 56, 567, 5678";

And I want to return the first 4 digit number in the string only.

I have a few thoughts on how I could do this, for example using:

explode(" ", $string)

And then perhaps

substr_count()

But I am not really sure how to return the first 4 digit number only, I have seen some examples of regex being used, but I don't think that would apply here.

phpstring


Solution 1:[1]

You could explode it with explode(", ",$string), and then loop through the result like this

function first4digit($string){
    $nums=explode(", ",$string);
    foreach($nums as $num){
       if(strlen($num)==4){
           return $num;
       }
    }
}

Here is a demo for it

Sources

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Source: Stack Overflow

Solution Source
Solution 1

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