Alphabetic equivalent of PHP is_numeric

Question

I am looking for a function that will be the literal equivalent of is_numeric. It will return true if the string contains only letters, and false otherwise. Is there a built-in function in PHP?

Answer 1

Do you want to ctype_alpha()

Answer 2

If you are strictly looking for the opposite is_numeric(), would not do the !is_numeric()job for you? Or do I not understand the question?

Answer 3

I would use preg_match. But that is because I never heard of ctype_alpha().

if(!preg_match("/[^a-zA-Z]/", $teststring)) {
    echo "There are only letters in this string";
} else {
    echo "There are non-letters in this string";
}

Answer 4

!is_numeric((float)$variableToBeChecked); also preg_match('#^[a-z]+$#i',$variableToBeChecked); // for one or more letter character