A ctype_alnum() function in PHP used to check all characters of given string/text are alphanumeric or not. If all characters are alphanumeric then return TRUE, otherwise return FALSE. Syntax:
bool ctype_alnum ($text)
Parameters Used:
- $text : It is a mandatory parameter which specifies the string.
Examples:
Input : Geeks
Output : Yes
Explanation : String "Geeks" is alphanumeric.
Note: Read Standard c local letter.
Input : '%%%Contribute_article on GFG!!!'
Output : No
Explanation : String contains Special characters.
Note: Except string or digit, if we input anything then it will return FALSE.
Below programs illustrate the ctype_alnum() function. Program :1 Drive a code ctype_alnum()() function for better understand.
PHP
<?php// PHP program to check given string is // all characters are alphanumeric$string = 'neveropen'; if ( ctype_alnum($string)) echo "Yes\n"; else echo "No\n";?> |
Output:
Yes
Program: 2 Drive a code of ctype_alnum() function where input will be an array of string integers, string with special symbols.
PHP
<?php// PHP program to check given string is // all characters are alphanumeric$strings = array( 'Geeks', 'geek@gmail.com', '2018', 'GFG2018', 'a b c ', '@!$%^&*()|2018');// Checking above given four strings // by used of ctype_alnum() function .foreach ($strings as $test) { if (ctype_alnum($test)) echo "Yes\n"; else echo "No\n"; }?> |
Output:
Yes No Yes Yes No No
References :http://php.net/manual/en/function.ctype-alnum.php
