在php中区分字母数字和字母

Question

i have two strings in a php i want to make following checks in that

1) 4f74adce2a4d2     - contains ***alphanumerics*** 

2) getAllInfo         - contains ***only alphabetic***  

to check this i wrote a function but whatever value $pk contains among above , results into true only , but i want to differentiate between alphanumeric and alphabetic only

<?php
if (ereg('[A-Za-z^0-9]', $pk)) {
    return true;
} else if (ereg('[A-Za-z0-9]', $pk)) {
    return false;
}
?>

Answer 1

Use the following two functions to detect whether a variable is alhpanumeric or alphabetic:

// Alphabetic
if(ctype_alpha($string)){
    // This is Alphabetic   
}

// Alphanumeric
if(ctype_alnum($string)){
    // This is Alphanumeric 
}

Visit this link for the reference guide: http://php.net/manual/en/book.ctype.php