ctype_xdigit

说明(参数 返回值)

范例

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'.

参数

text The tested string.

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

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.\";
} else {
echo "The string $testcase does not consist of all hexadecimal digits.\";
}
}
?> 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.