Check string is all uppercase

What's the best way to check if a string is all uppercase? I tried ctype_upper but it returns false if there is any whitespace in the string. I need to insert the string into a database if it is not all uppercase. I was doing this:

if (!ctype_upper($title) {
// insert into db
} else {
// do nothing
}

PHP:

Any ideas?

 

How about this?

if($title == strtoupper($title)){
//do something
} else{
//do something else
}

 

if (preg_match('~^[A-Z\s]$~', $title))

PHP:

 

I tried both methods but a 'STRING LIKE THIS' still slips through to the db. I currently have this:

if (preg_match('~^[A-Z\s]$~', $title[i])) {
$title[$i] = false;
} else {
//Insert into DB
}

PHP:

It's $title because it's going through a loop checking 10 titles. Any more ideas?

 

why not just strtolower()?

 

clarify, do you need to check or do you need to change it before inserting..

 

Basically if the string is all UPPERCASE I want to discard it and not insert it into the db. I know I could modify it so it's not all uppercase but then some strings that have some capitals in the string eg: 'Title Of DVD' would also be modified. Hope that makes sense. Thanks.

 

function is_uppercase($string, $result = false) {
	$len = strlen($string) - 1;
	for ($i = 0; $i <= $len; $i++) {
		if (ctype_alpha($string{$i}) && ctype_upper($string{$i}) === false) {
			$result = true;
		}
	}
	return $result;
}

// eg
$tests = array('asfasf3', 'asfHF', 'asf asf', 'AF AS F', 'ASGAHSG', 'AGHh');
foreach ($tests as $k) {
	echo $k , ': ' , (is_uppercase($k)) ? 'allow it, not all uppercase' : 'all uppercase', "<br />";
}

PHP:

If it returns 'true', then insert it, otherwise discard.

 

why not just strtolower and then ucfirst ?

 

Try checking after removing all whitespaces.

 

I forgot a plus sign here.

if (preg_match('~^[A-Z\s]+$~', $title))

PHP:

 

The below version is faster and safer, because it will work if $title[$i] has other characters like numbers or punctuations as well.

if ($title[$i] != strtoupper($title[$i])) {
   // insert to db
}

PHP:

 

Thanks to everyone for your help.

phper, I ended up using your solution. It appears to be working well. I could have sworn I tried something like that before and it didn't work. Ah well, thanks!