Migrating from C/C++ to PHP - function to determine character type_PHP tutorial

In C/C++, the header file ctype.h defines a set of macros about character types, which can get the type of a given character.
There are no related functions in PHP. A few days ago, I found that the PHP downloaded from www.mm4.de provides an extension library named php_ctype.dll.
After loading, I found that some such functions are provided, and I have compiled them for your reference.
After loading the php_ctype.dll file correctly in PHP, use to see the following information:
ctype
ctype functions enabled (experimental)
Then You can use the functions it provides. The usage of all functions is basically the same as in C/C++. The difference is that in C/C++, the function parameters are
character type (char), while in PHP, the function parameters can be strings (string). For example:

$string="123ADAADAD";
if(isalnum($string))
{
echo "Only uppercase and lowercase letters and numbers!" ;
}

?>

Attachment: Functions supported by php_ctype.dll
bool isalnum(string)
bool isalpha(string)
bool iscntrl( string)
bool isdigit(string)
bool isgraph(string)
bool islower(string)
bool isprint(string)
bool ispunct(string)
bool isspace(string)
bool isupper(string)
bool isxdigit(string)

[The copyright of this article is jointly owned by the author Fancao0515 and Aosuo.com. If you need to reprint, please indicate the author and source]  

http://www.bkjia.com/PHPjc/316621.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/316621.htmlTechArticleIn C/C++, the header file ctype.h defines a set of macros about character types, which can be obtained Specifies the type of character. There are no related functions in PHP. A few days ago, I found that in the PHP downloaded from www.mm4.de...