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How can I deturmine if a string contains any letters or numbers?

Posted on 2004-09-09
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Last Modified: 2011-10-03
Hello.

How can I deturmine if a string contains any letters or numbers?


Right now I am using this:

       if ($string != null) { echo "contains text"; }

But if the string has only spaces and new lines in it, the script returns "contains text"
I want it to do this only if there are letters or numbers in the string.

Thanks!
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Question by:hankknight
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4 Comments
 
LVL 48

Expert Comment

by:hernst42
ID: 12016490
You can try:

if (strlen(trim($string)) > 0) { echo "contains text.";}

trim removes any whitespace at the end and beginning of a string.
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LVL 13

Expert Comment

by:cLFlaVA
ID: 12016630
Try this:

if(ereg('[^A-Za-z0-9]', $string)){
    echo "String must contain only letters and numbers.";
}else{
    echo "$string has only letters and numbers.";
}
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LVL 16

Author Comment

by:hankknight
ID: 12017046
Thanks!

       if (strlen(trim($string)) > 0) { echo "contains text.";}

would work exept if my string contains funny characters ( ., ?, *, ©, etc ) it would still pass the test.

The ereg option is closer:

        if(ereg('[^A-Za-z0-9]', $string)){
            echo "String must contain only letters and numbers.";
        }else{
            echo "$string has only letters and numbers.";
        }

But this tells me if the string contains anything other than letters and numbers.  I want to find out if the string contains at least one letter or one number.
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LVL 13

Accepted Solution

by:
cLFlaVA earned 1332 total points
ID: 12017258
if(ereg('[A-Za-z0-9]', $string)){
            echo "Contains at least one letter or number";
        }else{
            echo "Does not contain letters or numbers.";
        }
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