ctype_alnum
(PHP 4 >= 4.0.4, PHP 5)
ctype_alnum -- Check for alphanumeric character(s)
说明
bool
ctype_alnum
( string text )
Checks if all of the characters in the provided string,
text
, are alphanumeric. In the standard
C
locale letters are just
[A-Za-z]
and the function is equivalent to
preg_match('/^[a-z0-9]*$/i', $text)
.
返回值
Returns
TRUE
if every character in
text
is either
a letter or a digit,
FALSE
otherwise.
范例
例子 1. A
ctype_alnum()
example (using the default locale)
<?php
$strings
= array(
'AbCd1zyZ9'
,
'foo!#$bar'
);
foreach (
$strings
as
$testcase
) {
if (
ctype_alnum
(
$testcase
)) {
echo
"The string $testcase consists of all letters or digits.
\n
"
;
} else {
echo
"The string $testcase does not consist of all letters or digits.
\n
"
;
}
}
?>
|
上例将输出：
The string AbCd1zyZ9 consists of all letters or digits.
The string foo!#$bar does not consists of all letters or digits.
|
|