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📜  CodeIgniter-常用功能

📅  最后修改于: 2020-10-26 05:34:23             🧑  作者: Mango

在使用CodeIgniter库函数和帮助器函数之前，需要对其进行初始化，但是有一些常用函数不需要初始化。

这些常用功能及其说明如下。

Syntax is_php($version)
Parameters

$version (string) − Version number
Return TRUE if the running PHP version is at least the one specified or FALSE if not
Return Type void
Description Determines if the PHP version being used is greater than the supplied version number.
Syntax is_really_writable($file)
Parameters

$file (string) − File path
Return TRUE if the path is writable, FALSE if not
Return Type bool
Description checks to see if file is writable or not.
Syntax config_item($key)
Parameters

$key (string) − Config item key
Return Configuration key value or NULL if not found
Return Type mixed
Description This function is used to get the configuration item
Syntax set_status_header($code[, $text = ”])
Parameters

$code (int) − HTTP Response status code

$text (string) − A custom message to set with the status code
Return
Return Type void
Description This function permits you to manually set a server status header.
Syntax remove_invisible_characters($str[, $url_encoded = TRUE])
Parameters

$str (string) − Input string

$url_encoded (bool) − Whether to remove URLencoded characters as well
Return Sanitized string
Return Type string
Description This function prevents inserting NULL characters between ASCII characters
Syntax html_escape($var)
Parameters

$var (mixed) − Variable to escape (string or array)
Return HTML escaped string(s)
Return Type mixed
Description This function acts as a native PHP htmlspecialchars() function.
Syntax get_mimes()
Return An associative array of file types
Return Type array
Description This function returns a reference to the MIMEs array from application/config/mimes.php.
Syntax is_https()
Return TRUE if currently using HTTP-over-SSL, FALSE if not
Return Type bool
Description Returns TRUE if a secure (HTTPS) connection is used and FALSE in any other case (including non-HTTP requests).
Syntax is_cli()
Return TRUE if currently running under CLI, FALSE otherwise
Return Type bool
Description Returns TRUE if the application is run through the command line and FALSE if not.
Syntax function_usable($function_name)
Parameters

$function_name (string) − Function name
Return Type bool
Description Returns TRUE if a function exists and is usable, FALSE otherwise.

下面给出的示例演示了上述所有功能。

例

在这里，我们仅创建了一个将使用上述功能的控制器。复制以下给定的代码，并将其保存在application / controller / CommonFun_Controller.php中。

"; 
         var_dump(is_really_writable('./Form.php')); 
            
         echo config_item('language')."
"; 
         echo remove_invisible_characters('This is a ‌test','UTF8')."
"; 
            
         $str = '< This > is \' a " test & string'; 
         echo html_escape($str)."
"; 
         echo "is_https():".var_dump(is_https())."
"; 
         echo "is_cli():".var_dump(is_cli())."
"; 
            
         var_dump(function_usable('test'))."
"; 
         echo "get_mimes():".print_r(get_mimes())."
"; 
      } 
  
      public function test() { 
         echo "Test function"; 
      } 
        
   } 
?>

更改位于application / config / routes.php的routes.php文件，以为上述控制器添加路由，并在文件末尾添加以下行。

$route['commonfunctions'] = 'CommonFun_Controller';

在浏览器的地址栏中键入以下URL以执行示例。

http://yoursite.com/index.php/commonfunctions