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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.

Further readings
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PHP Form Validation
is_numeric to check numeric numbers
ctype_alnum to check alphanumeric characters data
ctype_alpha to check alphabetic characters data
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