ctype_alpha
(PHP 4 >= 4.0.4, PHP 5)
ctype_alpha -- Check for alphabetic character(s)
Description
bool
ctype_alpha ( string text)
Returns TRUE if every character in text is
a letter from the current locale, FALSE otherwise.
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.
Example 1. A ctype_alpha() example (using the default locale)
<?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";
}
}
?>
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This example will output :
The string KjgWZC consists of all letters.
The string arf12 does not consists of all letters. |
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See also ctype_upper(),
ctype_lower(), and
setlocale().