ctype
This is the function in php form if your php is older than 4.0.4
<?php
if(!function_exists("ctype_xdigit")){
function ctype_xdigit($string = ""){
return !strlen( trim( $string, "1234567890abcdefABCDEF" ) );
}/* endfunction ctype_xdigit */
}/* endif not function_exists ctype_xdigit */
?>
ctype_xdigit
(PHP 4 >= 4.0.4, PHP 5)
ctype_xdigit — Skontrolovať znak(y) reprezentujúci(e) hexadecimálnu číslicu
Popis
bool ctype_xdigit
( string $text
)
Vracia TRUE, ak je každý znak v text e hexadecimálnou 'číslicou', t.j. desatinná číslica alebo znak z [A-Fa-f] , inak FALSE.
Tiež pozri ctype_digit().
add a note
User Contributed Notesctype_xdigit
dot dot dot dot dot alexander at gmail dot com
30-Jan-2008 10:41
30-Jan-2008 10:41
tom at hgmail dot com
14-Jan-2006 12:36
14-Jan-2006 12:36
This function shows its usefulness on a web site where a user is asked to entered a hexidecimal color code for a color. To prevent breaking W3C standard and having them enter in "neon-green" or the wrong type of code like 355511235.
In conjunction with strlen() you could create a function like this:
function check_valid_colorhex($colorCode) {
// If user accidentally passed along the # sign, strip it off
$colorCode = ltrim($colorCode, '#');
if (
ctype_xdigit($colorCode) &&
(strlen($colorCode) == 6 || strlen($colorCode) == 3))
return true;
else return false;
}