SPL Learning Note (5) Use of---functions

One: AutoLoad function

I: In order to instantiate the class object in PHP, it is necessary to find the definition of the class by some means.

Typically, a class is defined in a separate file.

Now we create a folder libs, build files test.php and Test.class.php

Libs/test.php and libs/test.class.php and index.php

1:libs/test.php's Code

1 <? PHP 2 class test{3      Public function __construct () {4         Echo "Loading class libs/test.php<br>"; 5     }6 }

2:libs/test.class.php's Code

1 <? PHP 2 class test{3      Public function __construct () {4         Echo "Loading class libs/test.class.php<br>"; 5     }6 }

3:index.php's Code

1<?PHP2 //set the Mount extension suffix name of the autoload, which can be multiple, separated by commas, preceded by precedence3Spl_autoload_extensions ('. class.php,.php '));4 //Setting Environment Variables5 Set_include_path(Get_include_path(). Path_separator. " libs/");6 //tell PHP to use the AutoLoad function to automatically load classes7 Spl_autoload_register ();8 //can use9 $obj=NewTest ();Ten //output Loading class libs/test.class.php

II: Other methods

__autoload () function and custom load function

1<?PHP2 //the Magic method automatically loads classes without using Spl_autoload_register3 function__autoload ($classname){4     require_once' libs/'.$classname.". Php;5 }6 //custom load classes, which can be automatically called using Spl_autoload_register ("Load")7 functionLoad$classname){8     require_once' libs/'.$classname.". Php;9 }Ten  One NewTest ();//output: Loading class libs/test.php

The load () function can use the Spl_autoload function without the require_once function

1 function Load ($classname) {2     spl_autoload ("libs/").  $classname); 3 }

Iii:autoload () Run process

Second: Other functions

The Splfileinfo class and the Splfileobject class.

1<?PHP2 $file=NewSplfileinfo ("Demo.txt");3 //File creation Time4 Echo"FILE is CREATE at".Date("Y-m-d h:i:s",$file->getctime ()). " <br> ";5 //File modification Time6 Echo"FILE is Modified".Date("Y-m-d h:i:s",$file->getmtime ()). " <br> ";7 //File Size8 Echo"FILE size is".$file->getsize (). "Bytes<br>";9 //Read File contentsTen $FILEOBJ=$file->openfile ("R"); One  while($FILEOBJ-valid ()) { A     //get a line of files -     Echo $FILEOBJ-fgets(); - } the $FILEOBJ=NULL;//close file, necessary - $file=NULL;//close file, necessary

Three: Course Summary

SPL Learning Note (5) Use of---functions