Simple php template engine technology implementation, php template engine

Simple php template engine technology implementation, php template engine

After using smarty and tp, I want to know how the template technology is implemented. So I wrote a simple template class, it is generally to read the template file-> Replace the content of the template file-> Save or static

Main analysis of tpl. class. php

Assign Method implementation

/*** Template assignment operation ** @ param mixed $ tpl_var if it is a string, it is used as an array index. If it is an array, cyclically assigned a value * @ param mixed $ tpl_value when $ tpl_var is string. The default value is null */public function assign ($ tpl_var, $ tpl_value = null) {if (is_array ($ tpl_var) & count ($ tpl_var)> 0) {foreach ($ tpl_var as $ k => $ v) {$ this-> tpl_vars [$ k] = $ v ;}} elseif ($ tpl_var) {$ this-> tpl_vars [$ tpl_var] = $ tpl_value ;}}

Fetch method implementation

/*** Generate the compilation file * @ param string $ tplFile template path * @ param string $ comFile compilation path * @ return string */private function fetch ($ tplFile, $ comFile) {// determine whether the compilation file needs to be regenerated (whether the compilation file exists or the template file modification time is later than the modification time of the compilation file) if (! File_exists ($ comFile) | filemtime ($ tplFile)> filemtime ($ comFile) {// compile. You can also use ob_start () here () static $ content = $ this-> tplReplace (file_get_contents ($ tplFile); file_put_contents ($ comFile, $ content );}}

Simple compilation method: regular replacement according to rules

/*** Compile the file * @ param string $ content the content to be compiled * @ return string */private function tplReplace ($ content) {// escape the regular expression character $ left = preg_quote ($ this-> left_delimiter, '/'); $ right = preg_quote ($ this-> right_delimiter, '/'); // simulate the compilation variable $ pattern = array (// For example, {$ test }'/'. $ left. '\ $ ([a-zA-Z _ \ x7f-\ xff] [a-zA-Z0-9 _ \ x7f-\ xff] *)'. $ right. '/I'); $ replace = array ('<? Php echo $ this-> tpl_vars [\ '$ {1} \'];?> '); // Return preg_replace ($ pattern, $ replace, $ content );}

Display = fetch + echo

/*** Output content * @ param string $ fileName template file name */public function display ($ fileName) {// template path $ tplFile = $ this-> template_dir. '/'. $ fileName; // determine whether the template exists if (! File_exists ($ tplFile) {$ this-> errorMessage = 'template file does not exist'; return false;} // compiled file $ comFile = $ this-> compile_dir. '/'. md5 ($ fileName ). '. php'; $ this-> fetch ($ tplFile, $ comFile); include $ comFile ;}

Other attributes

// Template file storage location private $ template_dir = 'templates'; // compilation file storage location private $ compile_dir = 'compiles'; // left delimiter private $ left_delimiter = '{'; // private $ right_delimiter = '}'; // internal temporary variable, which stores the user's private $ tpl_vars = array (); // error message private $ errorMessage = ''; /*** modify the value of the Class Attribute * @ param array $ configs the relevant attribute and value to be modified * @ return bool */public function setConfigs (array $ configs) {if (count ($ configs)> 0) {foreach ($ configs as $ k => $ v) {if (isset ($ this-> $ k )) $ this-> $ k = $ v;} return true;} return false ;}

Test

Template File testTpl.html

<! DOCTYPE html> 
Output: waited: 100: this is a demo
Generate the compilation file: 972fa4d270e295005c36c1dbc7e6a56c. php
The above is all the content of this article, hoping to help you learn.
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