ctype_alpha
PHP function
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(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
Check for alphabetic character(s)
Description
ctype_alpha(mixed $text): bool
Checks if all of the characters in the provided string, text, are alphabetic. In the standard C locale letters are just [A-Za-z] and ctype_alpha() is equivalent to (ctype_upper($text) || ctype_lower($text)) if $text is just a single character, but other languages have letters that are considered neither upper nor lower case.
Parameters
textThe tested string. Integer Non-string
Return Values
Returns true if every character in text is a letter from the current locale, false otherwise. Empty-string
Examples
A ctype_alpha() example (using the default locale)
php
<?php
$strings = array('KjgWZC', 'arf12');
foreach ($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";
}
}
?>The above example will output:
output
The string KjgWZC consists of all letters.
The string arf12 does not consist of all letters.