Detailed explanation of how to use php Smarty template

1. Comments in the template

Each Smarty template file is developed through Web front-end language (xhtml, css and javascript, etc.) combined with the syntax of the Smarty engine.

The language used for web front-end development is exactly the same as the original one, and the comments have not changed either

Smarty comment syntax is 'left terminator variable value*' and '*right terminator variable value'. The content between these two delimiters is the comment content, which can contain one or more lines, and the user can browse the web page to view it. You will not see comments in the original code, they are just comments inside the template. The following is a small example of comments.

$smarty->left_lelimiter = '<{';

$smarty->right_delimiter = '}>';

Note: <{* this a note *}>

The code is as follows

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$smarty->left_lelimiter = '<{';

$smarty->right_delimiter = '}>';

Note: <{* this a note *}>

2: Variable declaration in template

In Smarty, everything is based on variables, and all presentation logic is controlled by the template itself

There are several different types of variables. The type of a variable depends on what symbol it is prefixed with or surrounded by

Variables can be directly output or parameters of job function attributes and modifiers or used in internal conditional expressions, etc.

<{$name}> <{*Regular type variables, you need to call the assign function in the template to assign the value*}>

;

If you output a variable allocated from PHP in a Smarty template, you need to add a $ symbol in front of the variable and enclose it with a delimiter. The naming method is the same as the variable naming method in PHP, and the delimiter symbol is a bit like in PHP. of (in fact they will be replaced with this)

Three: Output the variables assigned from php in the template

There are two types of variables commonly used in Smarty templates: one is the variable assigned from php; the other is the variable read from the configuration file

Note: The template can only output variables allocated from PHP. These variables cannot be reassigned in the template. The variables are all global and only need to be allocated once. If allocated more than twice, the variable content will be allocated in the last Mainly

The foreach or section statement provided in Smarty is used to iterate through each element in the output array. The way index arrays and associative arrays are output in templates is slightly different. The way index arrays are accessed in templates and referenced in php scripts are Similarly, the way elements in an associative array are specified in the template is accessed using '.'.

Accessing objects in templates is the same as in php scripts, both through the '->' operator.

Four: Mathematical calculation of variables in Smarty template

Variables in templates cannot be directly assigned values, but they can participate in mathematical operations. As long as mathematical operations can be performed in PHP scripts, they can be applied in templates, as shown below:

<{$foo + 1}> <{* Variable plus 1 *}>

<{$foo * $bar}> <{* Multiply two variables *}>

<{$foo->bar - $bar[1] * $foo->bar - 3 * 7}> <{* Composite type variables participate in the operation *}>

<{if($foo + 2 == 10)}> <{* Mathematical operations are applied in program logic *}>

The code is as follows <{$foo + 1}> <{* Variable plus 1 *}>

Variables embedded in double quotes can be recognized in Smarty templates, but some variables must be wrapped in backticks '`' (this symbol is on the same key as '~'), as shown below:

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<{$foo * $bar}> <{* Multiply two variables *}>

<{$foo->bar - $bar[1] * $foo->bar - 3 * 7}> <{* Composite type variables participate in the operation *}>

<{if($foo + 2 == 10)}> <{* Mathematical operations are applied in program logic *}>

The code is as follows

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<{"test $foo test"}> <{* Use variables in double quotes *}>

<{"test `$foo[0]` test"}> <{* array variable enclosed in backticks in double quotes *}>

<{"test `$foo.bar` test"}> <{* Object member variables enclosed in backticks in double quotes *}>

<{"test $foo test"}> <{* Use variables in double quotes *}>

<{"test `$foo[0]` test"}> <{* array variable enclosed in backticks in double quotes *}>

<{"test `$foo.bar` test"}> <{* Object member variables enclosed in backticks in double quotes *}>

Step 1: Load Smarty template engine, such as: require 'libs/Smarty.class.php'

Step 2: Create a Smarty object, such as: $smarty = new Smarty();

Step 3: Modify Smarty’s default behavior, such as enabling caching, template storage path, etc.

Step 4: Assign the data obtained in the program to the corresponding variables in the template through the assign() method of the Smarty object

Step 5: Use the display() method of the Smarty object to output the template content

assign() method

This method is used to assign values to variables in the template, which is easier to use

Prototype: void assign(string varname,mixed var)

This method can assign the type data supported by php to template variables including arrays and objects

There are two ways to use it

//Specify a pair of 'name/value'
$smarty->assign('question','How are you');
$smarty->assign('answer','not so good');

//Specify to include 'name/value'
$smarty->assign(array('question' => 'How are you','answer' => 'Not so good'));//This method is less used
display() method

This method must be used in Smarty-based scripts, and can only be used once in a script. It is responsible for obtaining and displaying the template referenced by the Smarty engine

Prototype: var display(string template[,string cache_id][,string compile_id])

Parameter 1: template is required, specify the type and path of a legal template resource

Parameter two: cache_id specifies the name of a cache identifier

Parameter 3: compile_id is used when maintaining multiple caches for one page

How to use it is as follows
$smarty->display('tpl/template_dir/template.html');

Simple example

1. libs: It is the Smarty class library

2. tpl/cache_dir: store cache templates

3. tpl/compile_dir: stores compiled template files

4. tpl/config_dir: stores special configuration files

5. tpl/template_dir: store template files

Y 6. In the Smarty.php file, a Smarty class object is released and the attribute values of each object are set, as follows

require 'libs/Smarty.class.php';//Load the Smarty.class.php file

define ('SITE_ROOT','./tpl/' – – define a constant

$tpl = new Smarty();

$ TPL- & GT; Template_dir = site_root. 'Template_dir'; //

$tpl->compile_dir = SITE_ROOT . 'compile_dir';//Save the compiled template file

$tpl->config_dir = SITE_ROOT . 'config_dir';//Save special configuration files

$tpl->cache_dir = SITE_ROOT . 'cache_dir';//Save Smarty cache files

$ TPL-& GT; Caching = 1; // Enable cache

$tpl->cache_lifetime = 60*60*24;//Cache time 1 day

$tpl->left_delimiter = '<{';//Left terminator

$tpl->right_delimiter = '}>';//Right terminator

The code is as follows

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require 'libs/Smarty.class.php';//Load the Smarty.class.php file

define ('SITE_ROOT','./tpl/' – – define a constant

$tpl = new Smarty();

$ TPL- & GT; Template_dir = site_root. 'Template_dir'; //

$tpl->compile_dir = SITE_ROOT . 'compile_dir';//Save the compiled template file

$tpl->config_dir = SITE_ROOT . 'config_dir';//Save special configuration files

$tpl->cache_dir = SITE_ROOT . 'cache_dir';//Save Smarty cache files

$ TPL-& GT; Caching = 1; // Enable cache

$tpl->cache_lifetime = 60*60*24;//Cache time 1 day

$tpl->left_delimiter = '<{';//Left terminator

$tpl->right_delimiter = '}>';//Right terminator

7. Index.php file, the homepage code is as follows

require 'smarty.php';

$tpl->assign('title','title test');

$tpl->assign('content','content test');

$tpl->display('template.html');

8. tpl/template_dir/template.html This is a template file. The code is as follows

The code is as follows

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The code is as follows

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require 'smarty.php';

$tpl->assign('title','title test');

$tpl->assign('content','content test');

$tpl->display('template.html');

Detailed explanation of how to use php Smarty template_PHP tutorial