PHP | ctype_alpha() (Checks for alphabetic value)

A ctype_alpha() function in PHP used to check all characters of a given string are alphabetic or not. If all characters are alphabetic then return True otherwise return False.

Syntax:

ctype_alpha($text)

Parameters Used:

• $text :- It is a mandatory parameter which specifies the string.

Return Value:
It returns True if all characters of string are alphabets and a False on failure.

Examples:

Input  : GeeksforGeeks
Output : Yes

Explanation : String (GeeksforGeeks) contains only alphabets

Input  : GFG-GCET-2018
Output : No

Explanation : String contains Integer and special characters.
 
Note: Except string ,if you input anything then it will return FALSE.    

Below programs illustrate the ctype_alpha() function.

Program: 1

<?php
// PHP program to check given string is
// all characters -alphabetic

$string = 'GeeksforGeeks';

    if ( ctype_alpha($string))

        echo "Yes\n";
    else
        echo "No\n";
?>

Output:

Yes

Program : 2 Drive a code ctype_alpha() function where input an array of string which contains integers and special characters.

<?php
// PHP program to check given string is
// all characters are alphabetic

$strings = array(
    'GFG',
    'GFG space',
    '@@##-- /',
    '789543',
    '\n'
);

// Checking above given strings
// by used of ctype_alpha() function .
foreach ($strings as $test) {

    if (ctype_alpha($test))
        echo "Yes\n";
    else
        echo "No\n";

}

?>

Output:

Yes
No
No
No
No

Reference:
http://php.net/manual/en/function.ctype-alpha.php