The ctype_alnum method is used to check if all the characters of the text are alphanumeric.
ctype_alnum(mixed $text): bool
The ctype_alnum method returns a Boolean value.
The alphanumeric characters are
A-Z, a-z, and 0-9.
ctype_alnum returns true if and only if all of the characters in the text are alphanumeric. Otherwise, it returns false.
<?php$str = "abc";printAlphaNumeric($str);$str = "123ABccAAA";printAlphaNumeric($str);$str = "A B";printAlphaNumeric($str);function printAlphaNumeric($str){echo "The string is: ". $str. "\n";echo "Alphanumeric: ";var_dump(ctype_alnum($str));echo "---------\n";}?>
In the code above:
We use the ctype_alnum method to check if the string contains only alphanumeric characters.
For the string abc and 123ABccAAA, ctype_alnum returns true.
For the string A B, the ctype_alnum method returns false because the string contains the space character, which is not an alphanumeric character.