Ctype
ctype is a set of functions used for character type checking. These functions are primarily designed to determine the type of characters in a string. They are useful for tasks such as input validation, data processing, and character manipulation. The ctype functions are part of PHP’s standard library.
<?php
$strings = ['KjgWZC', 'arf12'];
foreach ($strings as $testcase) {
if (ctype_alpha($testcase)) {
echo "The string $testcase consists of all letters.\n";
} else {
echo "The string $testcase does not consist of all letters.\n";
}
}
?>