ctype_xdigit
(PHP 4 >= 4.0.4, PHP 5)
ctype_xdigit --
Check for character(s) representing a hexadecimal digit
说明
bool
ctype_xdigit
( string text )
Checks if all of the characters in the provided string,
text
, are hexadecimal 'digits'.
返回值
Returns
TRUE
if every character in
text
is
a hexadecimal 'digit', that is a decimal digit or a character from
[A-Fa-f]
,
FALSE
otherwise.
范例
例子 1. A
ctype_xdigit()
example
<?php
$strings
= array(
'AB10BC99'
,
'AR1012'
,
'ab12bc99'
);
foreach (
$strings
as
$testcase
) {
if (
ctype_xdigit
(
$testcase
)) {
echo
"The string $testcase consists of all hexadecimal digits.
\n
"
;
} else {
echo
"The string $testcase does not consist of all hexadecimal digits.
\n
"
;
}
}
?>
|
上例将输出：
The string AB10BC99 consists of all hexadecimal digits.
The string AR1012 does not consist of all hexadecimal digits.
The string ab12bc99 consists of all hexadecimal digits.
|
|