PHP 手册
上一页下一页


ctype_alpha

(PHP 4 >= 4.0.4, PHP 5)

ctype_alpha -- Check for alphabetic character(s)

说明

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 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";
    }
}
?>

上例将输出：

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

参见

ctype_upper()
ctype_lower()
setlocale()


add a note add a note User Contributed Notes
lxg
18-Jun-2007 11:18
A little replacement function:

<?php
if ( !function_exists('ctype_alpha') ) {
   function ctype_alpha($string) {
       if ( !preg_match('|[^\pL]|', $string) )
       /* alternative: */ // if ( !preg_match('|[^A-Za-z]|', $string) )
           return true;
       else
           return false;
   }
}
?>
add a note add a note


上一页起始页下一页
ctype_alnum上一级ctype_cntrl