Thinkphp's C Method usage example

  thinkphp friends know that the C () method is very common throughout the framework, the C method is very simple to implement, but the function is very powerful, the following is the C () method of understanding and using the example

1.C method   A. Load settings user's configuration, save in a C function static variable $_config   B. Read the user's configuration (read from $_congig)   2. Requirements Analysis:   1. Set variable   1. Two d array code as follows: C (' Db_password ' => ' root ', ' db_username ' => ' root '), ' DB ');   C (' DB. User_name ', ' xiaochen);       2. One-dimensional array     code is as follows: C (' user_name ', ' Xiao Chen ');   C (Array (' user_name ' => ' Chen ', ' user_height ' => ' 170 '));       2. Read variables     One dimension:   C (' user_name ');   Two-dimensional:  c (' DB. Db_password ');   3. When debugging, view all configuration information   C ();   3. Storage and why do you store it this way?   First we look at a problem $arr=array (' db ' => ' MySQL ', ' db ' => ' MySQL ', ' db ' => ' MySQL '); From this array we can see that DB is all pointing to MySQL, but it takes up three storage space, the development of the project is not done by one person, each person's writing habits may be different, so in order to avoid this situation, the uniform subscript to lowercase (of course, uppercase is also possible), Because the array in the configuration file is only a maximum of two dimensions, the subscript lowercase of the one-dimensional array is enough   4. How to use in the actual combat?   PHP because the operation of the array is very convenient, so the configuration file is generally written in a configuration file, in the form of an array return   General format is:      code as follows: CONFIG.PHP<?  return Array (' DB ' => ' MySQL ',......);       Write variables to C &NBSP: C (include ' config.php ');     After writing, C (' DB ') can get a value of   5. The author writes   (add dynamically adds two-dimensional configuration function)   code as follows:  c (' name ' => ' mysql ', ' password ' => ') Root '), ' DB ' is executed after array (' DB ' =>array (' name ' => ' mysql ', ' password ' =>root) ')     code example:    code as follows: function C ($name =null, $value =null) {  Static $_config = Array ();    if (!is_null ($name)) {    if ( Is_string ($name)) {     if (Is_null ($value)) {      if (!strpos ($name, '. ')) {        $name = Strtolower ($name);        return isset ($_config[$name))? $_confi g[$name]: null;       }else{        $name = explode ('. ', $name);     &N Bsp   $name [0] = strtolower ($name [0]);        return isset ($_config[$name [0]][$name [1]])? $_config[$name [0]][$name [1]]: null;      }      }else{      if (!strpos ($name, '. ')) {       $_config[strtolower ($name)] = $value;      }else{        $name = explode ('. ', $name);        $_CONFIG[STR ToLower ($name [0])] [$name [1]] = $value;      }       return;     &NBSP}    }elseif (Is_array ($name)) {     if (Is_null ($value))     &NBSP ; $_config = Array_merge ($_config, $name);      else{      $_config[$value] = $name;     &NBSP}      return ;    }    }else{       return empty ($_config)? null: $_config;  }}