1. The origin of the template
Before the template technology, using PHP to develop programs is usually mixed with php code and html. For example, a news list is likely to be a page with the structure as follows:
<?
//Read the news record to be displayed from the database.
?>
<html>
<head>……..
</head>
<body>
<?
While ($news = mysql_fetch_array($result)) {
?>
<!--Output News Title -- >
<?
}
?>
</body>
</html>
So what's the problem with this? First of all, it is not conducive to division of labor and cooperation. Generally speaking, programmers will write code and artists will design pages. In this way, the programmer must wait for the artist to design the interface before he can start working. In other words, the work of programmers and artists cannot be synchronized. Secondly, it is not conducive to maintenance and poor maintenance. For example, after the program is fixed, if the interface is modified, it must be modified by the artist and the programmer will add it again. Finally, the program structure is chaotic and has poor readability. HTML and PHP are mixed together, and once there are too many programs, it will become very messy.
Understanding the principle of templates—Template technology using PHP tags
Template technology emerged to solve these problems. In order to solve these problems, the earliest template technology that used php tags.
First of all, we need to understand what the purpose of the template is. How many tasks do templates mainly implement? First, the separation of art and procedures. To be more precise, the separation of acquisition data and display data. Second, division of labor. Good division of labor and cooperation.
For example, if you use a template, we can divide the operation of the news list into two parts:
1. Responsible for reading data from the database into the array $news, and not caring about how $news is displayed.
2. Responsible for outputting the $news array into HTML page. And it doesn't need to worry about where $news comes from.
OK, in this way, we have achieved the separation of art and program, achieving our initial goal, but how do we combine these two pages and implement the functions?
This requires another page to connect "Artist (display data)" and "Programmer (get data)". This page is very simple.
The assumed code is as follows:
<?
$news = "News List";//In fact, it should be read from the database.
?>
The code is as follows:
<html>
<head>
<title>Show news</title>
</head>
<body>
<?=$news?>
</body>
</html>
Then, the code for this joint page is very simple
<?
Include('');//Get data
Include('');//Show data
?>
Summarize
Using the PHP tag template system can achieve the separation of artists and programs well, and at the same time facilitate the division of labor and cooperation between programmers and artists. For example, in the above example, the artists are maintained by artists and programmers are maintained by programmers. And it can be maintained by the system designer. Of course, some agreed documents need to be added in the middle.
In fact, this simple example also illustrates the most basic MVC model. Among them, M, the model, is responsible for reading data, which is equivalent to ours. V is to try to display data, which corresponds to it. Finally, controller C, corresponding to ours
Learn interpretive template technology—PHPLIB
Phplib's template system has won the favor of many phpers for its compactness, flexibility, convenience and simplicity, and occupies a certain position in template technology. It and template engines such as fasttemplate are both interpretive template technology.
Before explaining the use of phplib, first explain why the template system using php tags needs to be improved. In fact, this is mainly because PHP tags are inconvenient for artists. They prefer to use this visual tag directly, such as {title}.
First, we modify our previous example to use visual tags to handle it. The first step is to change the php tag inside to a visual tag, the code is as follows:
<html>
<head>
<title>Show news</title>
</head>
<body>
{title}
</body>
</html>
The second step is, how to achieve the effect? Actually, it's very simple. I just need to replace {title} with nothing? Therefore, the modified code is as follows:
<?
Include('');//Get data
echo str_replace('{title}',$news,file_get_contents(''))
?>
In fact, this is the principle of phplib! For example, if we want to use phplib to implement the above function, we only need to modify it. The modified code is as follows:
<?
Include('');//Get data
include('');
$t=new Template();
$t->set_file(‘shownesw,'');
$t->set_var('news',$news);
$t->parse('out', ‘shownesw');
$t->p('out');
?>
In addition, for the phplib area, you can check the corresponding manual.
Compiled samrty, let's continue to talk about it next time
Before the template technology, using PHP to develop programs is usually mixed with php code and html. For example, a news list is likely to be a page with the structure as follows:
<?
//Read the news record to be displayed from the database.
?>
<html>
<head>……..
</head>
<body>
<?
While ($news = mysql_fetch_array($result)) {
?>
<!--Output News Title -- >
<?
}
?>
</body>
</html>
So what's the problem with this? First of all, it is not conducive to division of labor and cooperation. Generally speaking, programmers will write code and artists will design pages. In this way, the programmer must wait for the artist to design the interface before he can start working. In other words, the work of programmers and artists cannot be synchronized. Secondly, it is not conducive to maintenance and poor maintenance. For example, after the program is fixed, if the interface is modified, it must be modified by the artist and the programmer will add it again. Finally, the program structure is chaotic and has poor readability. HTML and PHP are mixed together, and once there are too many programs, it will become very messy.
Understanding the principle of templates—Template technology using PHP tags
Template technology emerged to solve these problems. In order to solve these problems, the earliest template technology that used php tags.
First of all, we need to understand what the purpose of the template is. How many tasks do templates mainly implement? First, the separation of art and procedures. To be more precise, the separation of acquisition data and display data. Second, division of labor. Good division of labor and cooperation.
For example, if you use a template, we can divide the operation of the news list into two parts:
1. Responsible for reading data from the database into the array $news, and not caring about how $news is displayed.
2. Responsible for outputting the $news array into HTML page. And it doesn't need to worry about where $news comes from.
OK, in this way, we have achieved the separation of art and program, achieving our initial goal, but how do we combine these two pages and implement the functions?
This requires another page to connect "Artist (display data)" and "Programmer (get data)". This page is very simple.
The assumed code is as follows:
<?
$news = "News List";//In fact, it should be read from the database.
?>
The code is as follows:
<html>
<head>
<title>Show news</title>
</head>
<body>
<?=$news?>
</body>
</html>
Then, the code for this joint page is very simple
<?
Include('');//Get data
Include('');//Show data
?>
Summarize
Using the PHP tag template system can achieve the separation of artists and programs well, and at the same time facilitate the division of labor and cooperation between programmers and artists. For example, in the above example, the artists are maintained by artists and programmers are maintained by programmers. And it can be maintained by the system designer. Of course, some agreed documents need to be added in the middle.
In fact, this simple example also illustrates the most basic MVC model. Among them, M, the model, is responsible for reading data, which is equivalent to ours. V is to try to display data, which corresponds to it. Finally, controller C, corresponding to ours
Learn interpretive template technology—PHPLIB
Phplib's template system has won the favor of many phpers for its compactness, flexibility, convenience and simplicity, and occupies a certain position in template technology. It and template engines such as fasttemplate are both interpretive template technology.
Before explaining the use of phplib, first explain why the template system using php tags needs to be improved. In fact, this is mainly because PHP tags are inconvenient for artists. They prefer to use this visual tag directly, such as {title}.
First, we modify our previous example to use visual tags to handle it. The first step is to change the php tag inside to a visual tag, the code is as follows:
<html>
<head>
<title>Show news</title>
</head>
<body>
{title}
</body>
</html>
The second step is, how to achieve the effect? Actually, it's very simple. I just need to replace {title} with nothing? Therefore, the modified code is as follows:
<?
Include('');//Get data
echo str_replace('{title}',$news,file_get_contents(''))
?>
In fact, this is the principle of phplib! For example, if we want to use phplib to implement the above function, we only need to modify it. The modified code is as follows:
<?
Include('');//Get data
include('');
$t=new Template();
$t->set_file(‘shownesw,'');
$t->set_var('news',$news);
$t->parse('out', ‘shownesw');
$t->p('out');
?>
In addition, for the phplib area, you can check the corresponding manual.
Compiled samrty, let's continue to talk about it next time