get_browser
It's possible to use __halt_compiler() with included files.
Only the current file will be affected, so it could be a good way to make plugins which embed a controller and its view in the same file (like Ultimater at gmail dot com did).
Base.php
<?php
echo "Base 1\n";
require 'Included.php';
echo "Base2 \n";
?>
Included.php
<?php
echo "Included 1\n";
__halt_compiler();
echo "Included 2\n";
?>
Calling Base.php will display:
Base 1
Included 1
Base 2
__halt_compiler
(PHP 5)
__halt_compiler — Halts the compiler execution
Описание
void __halt_compiler
( void
)
Halts the execution of the compiler. This can be useful to embed data in PHP scripts, like the installation files.
Byte position of the data start can be determined by the __COMPILER_HALT_OFFSET__ constant which is defined only if there is a __halt_compiler() presented in the file.
Връщани стойности
Няма връщана стойност.
Примери
Example #1 A __halt_compiler() example
<?php
// open this file
$fp = fopen(__FILE__, 'r');
// seek file pointer to data
fseek($fp, __COMPILER_HALT_OFFSET__);
// and output it
var_dump(stream_get_contents($fp));
// the end of the script execution
__halt_compiler(); the installation data (eg. tar, gz, PHP, etc.)
Бележки
Забележка: __halt_compiler() can only be used from the outermost scope.
add a note
User Contributed Notes
__halt_compiler
mael d0t nison 47 epitech d0t net
17-Nov-2010 07:06
ravenswd at gmail dot com
29-Jun-2010 06:16
__halt_compiler is also useful for debugging. If you need to temporarily make a change that will introduce an error later on, use __halt_compiler to prevent syntax errors. For example:
<?php
if ( $something ):
print 'something';
endif; // endif placed here for debugging purposes
__halt_compiler();
endif; // original location of endif -- would produce syntax error if __halt_compiler was not there
?>
Ultimater at gmail dot com
14-May-2009 06:36
Another possible usage, in addition to binary data and installers,
is using it to separate model, view and controller logic from one another:
<?php
class viewhelper{function render(){
eval(file_get_contents(__FILE__,null,null,__COMPILER_HALT_OFFSET__));
}}
//database logic goes here
$row=array(
'loggedin'=>true,
'modcp'=>true,
'admincp'=>false,
'username'=>'Ultimater',
'userid'=>1234
);
//database logic goes here
//controller logic goes here
$view=new viewhelper;
$view->title="Test -> Ultimater's MVC example";
$view->base="http://".$_SERVER['HTTP_HOST'];
$view->username=$row['username'];
$view->userid=$row['userid'];
$view->authbar->loggedin=$row['loggedin'];
$view->authbar->modcp=$row['modcp'];
$view->authbar->admincp=$row['admincp'];
$view->render();
//controller logic goes here
__halt_compiler();?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title><?=htmlentities($this->title)?></title>
<style type="text/css">
a{color:#3333ff;text-decoration:none;}
a:hover{color:#0380fc;}
</style>
</head>
<body>
<?php
if($this->authbar->loggedin){
?>
<table><tr>
<td>Hello <a href="<?=$this->base?>/showuser.php?id=<?=$this->userid?>
"><?=htmlentities($this->username)?></a></td><td>[</td>
<td><a href="<?=$this->base?>/logout.php">Log Out</a></td>
<th><a href="<?=$this->base?>/usercp.php">UserCP</a></th>
<? if($this->authbar->modcp){ ?>
<td>·</td><th><a href="<?=$this->base?>/modcp.php">ModCP</a></th>
<? } ?>
<? if($this->authbar->admincp){ ?>
<td>·</td><th><a href="<?=$this->base?>/admincp.php">AdminCP</a></th>
<? } ?>
<td>]</td>
</tr></table>
<?php
}else{
?>
<table><tr><td>Hello Guest</td><td>[</td>
<td><a href="<?=$this->base?>/login.php">Log In</a></td>
<th><a href="<?=$this->base?>/register.php">Register</a></th>
<td>]</td></tr></table>
<? } ?>
</body>
</html>
gn_shallyNOSPAM at yahoo dot com
03-Jun-2008 07:56
actually, __halt_compiler did something, even in eval function, that things is set the constant __COMPILER_HALT_OFFSET__ to the right value
as all of you might know, PHP will change content of some magic constant like __FUNCTION__, __CLASS__, etc based on the situation. so do the __COMPILER_HALT_OFFSET__ constant, is a file specific constant, just like the __FILE__ constant, the content will be changed based on wich file the __halt_compiler() reside.
try this:
/**** whatever.php ****/
<?php
eval('echo __FILE__."(".__COMPILER_HALT_OFFSET__.")\n"; __halt_compiler();');
echo __FILE__."(".__COMPILER_HALT_OFFSET__.")\n"; __halt_compiler();
if (!isset($whatever))
{
$whatever = 'whatever';
include __FILE__;
}
__halt_compiler();whatever
zsh
12-Oct-2007 04:11
__halt_compiler() is a language construct and therefore cannot be used as a variable function.
Also, it cannot be used in eval() -- it won't throw a syntax error, but it won't do anything either.