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PHP: ctype_xdigit - Manual
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ctypectype_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.\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.
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