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= Known incompatibilities with Smarty 2 =

== Syntax ==

Smarty 3 API has a new syntax. Much of the Smarty 2 syntax is supported
by a wrapper but deprecated. See the README that comes with Smarty 3 for more
information.

The {$array|@mod} syntax has always been a bit confusing, where an "@" is required
to apply a modifier to an array instead of the individual elements. Normally you
always want the modifier to apply to the variable regardless of its type. In Smarty 3,
{$array|mod} and {$array|@mod} behave identical. It is safe to drop the "@" and the
modifier will still apply to the array. If you really want the modifier to apply to
each array element, you must loop the array in-template, or use a custom modifier that
supports array iteration. Most smarty functions already escape values where necessary
such as {html_options}

== PHP Version ==
Smarty 3 is PHP 5 only. It will not work with PHP 4.

== {php} Tag ==
The {php} tag is disabled by default. The use of {php} tags is
deprecated. It can be enabled with $smarty->allow_php_tag=true.

But if you scatter PHP code which belongs together into several
{php} tags it may not work any longer.

== Delimiters and whitespace ==
Delimiters surrounded by whitespace are no longer treated as Smarty tags.
Therefore, { foo } will not compile as a tag, you must use {foo}. This change
Makes Javascript/CSS easier to work with, eliminating the need for {literal}.
This can be disabled by setting $smarty->auto_literal = false;

== Unquoted Strings ==
Smarty 2 was a bit more forgiving (and ambiguous) when it comes to unquoted strings
in parameters. Smarty3 is more restrictive. You can still pass strings without quotes
so long as they contain no special characters. (anything outside of A-Za-z0-9_)

For example filename strings must be quoted
<source lang="smarty">
{include file='path/foo.tpl'}
</source>

== Extending the Smarty class ==
Smarty 3 makes use of the __construct method for initialization. If you are extending
the Smarty class, its constructor is not called implicitly if the your child class defines
its own constructor. In order to run Smarty's constructor, a call to parent::__construct()
within your child constructor is required.

<source lang="php">
class MySmarty extends Smarty {
function __construct() {
parent::__construct();

// your initialization code goes here

}
}
</source>

== Autoloader ==
Smarty 3 does register its own autoloader with spl_autoload_register. If your code has
an existing __autoload function then this function must be explicitly registered on
the __autoload stack. See http://us3.php.net/manual/en/function.spl-autoload-register.php
for further details.

== Plugin Filenames ==
Smarty 3 optionally supports the PHP spl_autoloader. The autoloader requires filenames
to be lower case. Because of this, Smarty plugin file names must also be lowercase.
In Smarty 2, mixed case file names did work.

== Scope of Special Smarty Variables ==
In Smarty 2 the special Smarty variables $smarty.section... and $smarty.foreach...
had global scope. If you had loops with the same name in subtemplates you could accidentally
overwrite values of parent template.

In Smarty 3 these special Smarty variable have only local scope in the template which
is defining the loop. If you need their value in a subtemplate you have to pass them
as parameter.
<source lang="smarty">
{include file='path/foo.tpl' index=$smarty.section.foo.index}
</source>

== SMARTY_RESOURCE_CHAR_SET ==
Smarty 3 sets the constant SMARTY_RESOURCE_CHAR_SET to utf-8 as default template charset.
This is now used also on modifiers like escape as default charset. If your templates use
other charsets make sure that you define the constant accordingly. Otherwise you may not
get any output.

== newline at {if} tags ==
A \n was added to the compiled code of the {if},{else},{elseif},{/if} tags to get output of newlines as expected by the template source.
If one of the {if} tags is at the line end you will now get a newline in the HTML output.

== trigger_error() ==
The API function trigger_error() has been removed because it did just map to PHP trigger_error.
However it's still included in the Smarty2 API wrapper.

== Smarty constants ==
The constants
SMARTY_PHP_PASSTHRU
SMARTY_PHP_QUOTE
SMARTY_PHP_REMOVE
SMARTY_PHP_ALLOW
have been replaced with class constants
Smarty::PHP_PASSTHRU
Smarty::PHP_QUOTE
Smarty::PHP_REMOVE
Smarty::PHP_ALLOW

Change log

r4423 by monte.ohrt on Oct 19, 2011   Diff
fix text filenames, update changelog
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Older revisions

r4274 by monte.ohrt on Sep 16, 2011   Diff
commit 3.1 into the trunk
r4036 by monte.ohrt on Mar 3, 2011   Diff
do some updates to the text
r3765 by monte.ohrt on Nov 11, 2010   Diff
finish commit, resolve conflict
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