PHP website instance analysis

<? Php
If (version_compare (PHP_VERSION, 5.0.0, <) {// version earlier than 5.0.0
Die (ThinkPHP 1. * require_once PHP> 5.0 !); // Prompt and terminate
}
// Record start time bkJia comments
$ GLOBALS [_ beginTime] = microtime (TRUE );

// The global variable TRUE indicates the addition of seconds and microseconds.

 

// ThinkPHP system directory Definition
If (! Defined (THINK_PATH) define (THINK_PATH, dirname (_ FILE __));

// The value of THINK_PATH is d: www_4000Think_path.

 

// Dirname (_ FILE _); the directory name on the top of the FILE is obtained.
// Dirname (_ FILE _); the directory name of the FILE layer is obtained.

 

If (! Defined (APP_NAME) define (APP_NAME, md5 (THINK_PATH ));
// Encrypt the application name without the constant APP_NAME (bkJia)

 

If (! Defined (APP_PATH) define (APP_PATH, dirname (THINK_PATH)./. APP_NAME );

If (! Defined (RUNTIME_PATH) define (RUNTIME_PATH, APP_PATH./Temp /);

// Runtime path

 

If (file_exists (RUNTIME_PATH .~ Runtime. php )){
// This file is included in the runtime path, and the core cache file of the Framework is loaded.
// If the core file is modified, delete the cache (bkjia.com)
Require_once RUNTIME_PATH .~ Runtime. php;
} Else {
// Load the system definition file
Require_once THINK_PATH. "/Common/defines. php ";
// System function library
Require_once THINK_PATH. "/Common/functions. php ";
// Load the function file required for compilation
Require_once THINK_PATH. "/Common/runtime. php ";
// The project directory structure is automatically created if it does not exist during the first run check.
If (! File_exists (RUNTIME_PATH )){
// Create a project directory structure
BuildAppDir ();
}

// Load the ThinkPHP base class
Import ("Think. Core. Base ");

// Load exception handling class
Import ("Think. Exception. ThinkException ");

// Load the log class
Import ("Think. Util. Log ");

// Load the Think core class
Import ("Think. Core. App ");

Import ("Think. Core. Action ");

Import ("Think. Core. Model ");

Import ("Think. Core. View ");

// Whether to generate the core Cache
$ Cache = (! Defined (CACHE_RUNTIME) | CACHE_RUNTIME = true );
If ($ cache ){
If (defined (STRIP_RUNTIME_SPACE) & STRIP_RUNTIME_SPACE = false ){
$ Fun = file_get_contents;
} Else {
$ Fun = php_strip_whitespace;
}
// Generate the cache of the core file and remove the file blank to reduce the size
$ Content = $ fun (THINK_PATH./Common/defines. php );
$ Content. = $ fun (THINK_PATH./Common/functions. php );
$ Content. = $ fun (THINK_PATH./Lib/Think/Core/Base. class. php );
$ Content. = $ fun (THINK_PATH./Lib/Think/Exception/ThinkException. class. php );
$ Content. = $ fun (THINK_PATH./Lib/Think/Util/Log. class. php );
$ Content. = $ fun (THINK_PATH./Lib/Think/Core/App. class. php );
$ Content. = $ fun (THINK_PATH./Lib/Think/Core/Action. class. php );
$ Content. = $ fun (THINK_PATH./Lib/Think/Core/Model. class. php );
$ Content. = $ fun (THINK_PATH./Lib/Think/Core/View. class. php );
}
If (version_compare (PHP_VERSION, 5.2.0, <)){
// Load compatible Functions
Require_once THINK_PATH./Common/compat. php;
If ($ cache ){
$ Content. = $ fun (THINK_PATH./Common/compat. php );
}
}
If ($ cache ){
File_put_contents (RUNTIME_PATH .~ Runtime. php, $ content); // write a string to a file
Unset ($ content); // destroy $ content
}
}
// Record the file loading time
$ GLOBALS [_ loadTime] = microtime (TRUE );
?>