Validating only alphabetic characters by ctype_alphaBy using ctype_alpha function in php we can check or validate alphabetic characters only. Using this function we can check any input coming from insecure ( or any other ) sources. This function is case insensitive so can't differentiate between lower case and upper case alphabetic characters. Here is the syntax of this function.
Now let us try with some examples.
We can check user input from a form for presence of alphabets only, here is the sample code.
To check only alphanumeric characters we can use ctype_alnum function.