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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";
}
}
?>
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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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