Ctype 函数
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ctype_alpha

(PHP 4 >= 4.0.4, PHP 5)

ctype_alphaCheck 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

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";
    }
}
?>

以上例程会输出:

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

注释

Note:

如果给出一个 -128 到 255 之间(含)的整数, 将会被解释为该值对应的ASCII字符 (负值将加上 256 以支持扩展ASCII字符). 其它整数将会被解释为该值对应的十进制字符串.

参见


Ctype 函数
在线手册:中文  英文

用户评论:

Tyrunur (2009-05-27 02:12:20)

It works if you set the locale correctly:

<?php 

setLocale
(LC_CTYPE'FR_fr.UTF-8');

?>

with this change you will get "yes" "yes"

jerome at yazo dot net (2009-03-14 20:18:54)

worth noticing? It seems that the ctype_alpha family of functions won't handle UTF-8 string (php 5.2.6)

<?php

$texte 
'jér?me';
setLocale(LC_CTYPE'FR_fr');
echo 
'Pure ascii ? ', (ctype_alpha($texte) ) ? 'yes' 'no';
echo 
'<br />';
$texte iconv"UTF-8""ISO-8859-1"$texte) ;
echo  
'Letters only ? ' , (ctype_alpha($texte) ) ? 'yes' 'no';

?>

ouputs :

Pure ascii ? no
Letters only ? yes

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