ctype_alpha

Check for alphabetic character(s) (PHP 4 >= 4.0.4, PHP 5)
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.

参数

text

The tested string.

返回值

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

范例

例 380. 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";
   }
}
?>

上例将输出:

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