ctype_xdigit Check for character(s) representing a hexadecimal digit


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

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

以上例程会输出:

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.

注释

Note:

If an integer between -128 and 255 inclusive is provided, it is interpreted as the ASCII value of a single character (negative values have 256 added in order to allow characters in the Extended ASCII range). Any other integer is interpreted as a string containing the decimal digits of the integer.

参见


«  ctype_upper
» curl_close
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