ctype_alpha

(PHP 4 >= 4.0.4, PHP 5)

ctype_alpha -- Check for alphabetic character(s)

Описание

bool ctype_alpha ( string text )

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.

Список параметров

text

The tested string.

Возвращаемые значения

Returns TRUE if every character in text is a letter from the current locale, FALSE otherwise.

Примеры

Пример 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";
   }
}
?>

Результат выполнения данного примера:

The string KjgWZC consists of all letters.
The string arf12 does not consists of all letters.

Смотрите также

ctype_upper()
ctype_lower()
setlocale()



ctype_alpha
egypt at nmt dot edu
21-Nov-2003 05:16
Be careful with all of the ctype_* functions as they return true on the empty string, so the following code will execute forever.

(see also http://bugs.php.net/30945)

<?php
$string = "abc";
// infinite loop!
for($i = 4;ctype_alpha($string[$i]); $i++)
{
   print $i;
}
?>

so always check the length of the string before doing something like that. i.e.:

while($i < strlen($string) && ctype_alpha($string[$i]))

<ctype_alnumctype_cntrl>
 Last updated: Tue, 15 Nov 2005