Validating only alphabetic characters by ctype_alpha

By 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.
bool ctype_alpha($text)
Now let us try with some examples.

$var="AbCDef";
if(ctype_alpha($var)){
echo " This is alphabetic ";
}else{ echo "this is not alphabetic";}
By changing the value of $var you can check this function.
We can check user input from a form for presence of alphabets only, here is the sample code.

if(ctype_alpha($_POST['var'])){
echo " This is alphabetic ";
}else{ echo "this is not alphabetic";}
To check only alphanumeric characters we can use ctype_alnum function.

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