PHP Template engine Technology simple implementation _php instance

After using the SMARTY,TP, also want to understand how its template technology is implemented, so write a simple template class, is basically read template file-> Replace template file content-> Save or static

tpl.class.php Main Analysis

Assign method implementation

/**
     * Template Assignment Operation
     * @param mixed $TPL _var If it is a string, it is an array index, and if it is an array, the value of the loop assignment
     * @param mixed $tpl _value when $tpl_ Value when Var is string, default is null
     /public
    function Assign ($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 compilation file
      * @param string $tplFile template path
      * @param string $comFile compile path
      * @return string
     /
    Priv Ate function Fetch ($tplFile, $comFile) {

      //Determine whether the compiled file needs to be rebuilt (whether the compiled file exists or the template file is modified more than the compilation file modified)
      if (!file_exists) ($ Comfile) | | Filemtime ($tplFile) > Filemtime ($comFile)) {
        //compilation, where you can also use Ob_start () for static
        $content = $this-> Tplreplace (file_get_contents ($tplFile));
        File_put_contents ($comFile, $content);
      }

      

Simple Compilation Method: regular substitution by rule

 /**
     * Compile
     the file * @param string $content The content to be compiled
     * @return string
    /Private Function Tplreplace ($content {
      ///Escape the left-right delimiter regular expression character
      $left = Preg_quote ($this->left_delimiter, '/');
      $right = Preg_quote ($this->right_delimiter, '/');

      Simple analog 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}\ ';?> '
        );

      Regular process return
      preg_replace ($pattern, $replace, $content);
    

display = Fetch+echo

 /**
     * Output
     * @param string $fileName template file name
     *
    /Public Function display ($fileName) {
      //template path
      $ Tplfile = $this->template_dir. '/'. $fileName;

      Determine if the template exists
      if (!file_exists ($tplFile)) {
        $this->errormessage = ' template file does not exist ';
        return false;
      }

      The compiled file
      $comFile = $this->compile_dir. MD5 ($fileName). PHP ';

      $this->fetch ($tplFile, $comFile);
      
Include $comFile;
    }

Other properties

 Template file storage location
    private $template _dir = ' templates '; 

    Compile file storage location
    private $compile _dir = ' compiles ';

    Left delimiter
    private $left _delimiter = ' {';

    Right delimiter 
    private $right _delimiter = '} '; 

    Internal temporary variable, store user assigned
    private $TPL _vars = Array ();

    Error message
    private $errorMessage = ';

    /**
     * Modify the value of the class attribute
     * @param array $configs related properties and values that need 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

Build compilation file: 972fa4d270e295005c36c1dbc7e6a56c.php

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