crack_opendict
In PHP versions before 4.4.1, ctype functions have a bug handling very large integers.
http://bugs.php.net/bug.php?id=34645
See Crimson's comment under ctype_digit, or this test code from the bug:
<?php
$id = 394829384;
var_dump($id);
ctype_digit($id);
var_dump($id);
?>
Expected result:
----------------
int(394829384)
int(394829384)
Actual result:
--------------
int(394829384)
NULL
The fix is to cast it as a string:
<?php
ctype_digit((string)$id);
?>
... or use a current version of PHP!
Character Type Functions
简介
The functions provided by this extension check whether a character or string falls into a certain character class according to the current locale (see also setlocale()).
When called with an integer argument these functions behave exactly like their C counterparts from ctype.h. It means that if you pass an integer smaller than 256 it will use the ASCII value of it to see if it fits in the specified range (digits are in 0x30-0x39). If the number is between -128 and -1 inclusive then 256 will be added and the check will be done on that.
When called with a string argument they will check every character in the string and will only return TRUE if every character in the string matches the requested criteria. When called with an empty string the result will always be TRUE in PHP < 5.1 and FALSE since 5.1.
Passing anything else but a string or integer will return FALSE immediately.
It should be noted that ctype functions are always preferred over regular expressions, and even to some equivalent str_* and is_* functions. This is because of the fact that ctype uses a native C library and thus processes significantly faster.
需求
None besides functions from the standard C library which are always available.
安装
Beginning with PHP 4.2.0 these functions are enabled by default. For older versions you have to configure and compile PHP with --enable-ctype. You can disable ctype support with --disable-ctype.
PHP 的 Windows 版本已经内置该扩展模块的支持。无需加载任何附加扩展库即可使用这些函数。
Note: Builtin support for ctype is available with PHP 4.3.0.
运行时配置
本扩展模块在 php.ini 中未定义任何配置选项。
资源类型
本扩展模块未定义任何资源类型。
预定义常量
本扩展模块未定义任何常量。
Table of Contents
- ctype_alnum — Check for alphanumeric character(s)
- ctype_alpha — Check for alphabetic character(s)
- ctype_cntrl — Check for control character(s)
- ctype_digit — Check for numeric character(s)
- ctype_graph — Check for any printable character(s) except space
- ctype_lower — Check for lowercase character(s)
- ctype_print — Check for printable character(s)
- ctype_punct — Check for any printable character which is not whitespace or an alphanumeric character
- ctype_space — Check for whitespace character(s)
- ctype_upper — Check for uppercase character(s)
- ctype_xdigit — Check for character(s) representing a hexadecimal digit
add a note
User Contributed Notesctype
14-Oct-2006 07:44
avarab at gmail dot com
03-Jan-2006 12:58
03-Jan-2006 12:58
In case the ctype_*() functions aren't compiled in your PHP and you can't recompile for some reason (e.g. shared host) you can use the compatability functions from the MediaWiki project which use preg_* as a replacement[1], removing lines 2 and 3 in the source should make them suitable for usage elsewhere.
Shameless self-advertisement, but hey, we find them useful;)
1. A tinyurl because the submission script complained about long lines: http://tinyurl.com/7hz4l
1. The real url split up:
http://cvs.sourceforge.net/viewcvs.py/*checkout*/
wikipedia/phase3/includes/compatability/ctype.php