PHP Classes

File: class.AbsTemplate.php

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File: class.AbsTemplate.php
Role: Class source
Content type: text/plain
Description: The base class
Class: AbsTemplate
Template engine based PHP script templates
Author: By
Last change: I have updated the class to accept a global expiry time to set when you cache templates. This setting can still be overridden when getting a template.
Date: 15 years ago
Size: 13,689 bytes
 

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<?php /* * ChangeLog: * :: Date Tue Apr 28, 2009 * =========================================== * :: The new property ($defaultCacheExpiryTime) has been added and represent the default expiry time to set * when caching templates. * :: A new parameter ($defaultExpiryTime) has been added to the constructor * :: A new public method (SetDefaultExpiryTime) has been added to this class and will set the default expiry time * * */ /** * class AbsTemplate * * The Template Engine's base class. * * Features: * - set your own custom delimiters for variables to use inside template files, * - use any type of templates you want, that is, the template files can have any extension you want(be it .php, .inc, .tpl, etc...), * - display multiple templates per page, * - cache templates, * - assign the content of a template to a variable and, when appropriate, just display its content. * * @package AbsTemplate * @category Cache, Templates * @author Costin Trifan <costintrifan@yahoo.com> * @copyright 2009 Costin Trifan * @licence MIT License http://en.wikipedia.org/wiki/MIT_License * @version 1.0 * * Copyright (c) 2009 Costin Trifan <http://june-js.com/> * * Permission is hereby granted, free of charge, to any person * obtaining a copy of this software and associated documentation * files (the "Software"), to deal in the Software without * restriction, including without limitation the rights to use, * copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following * conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. */ class AbsTemplate { private function __clone(){} # PROTECTED PROPERTIES #====================== protected $tpl_dir = '', # The name of the folder where the template files are supposed to be stored. $cache_dir = '', # The name of the folder where the cached template files are supposed to be stored. $left_delimiter = '{', # The left delimiter to use in the templates files to mark a template variable. $right_delimiter = '}', # The right delimiter to use in the templates files to mark a template variable. $vars = array(), # The class's variables array. $defaultCacheExpiryTime = 1; # Set the default templates' cache expiry time to 1 hour # PUBLIC METHODS #====================== /** * Constructor. Setup class's variables. * * @param string $tplDir The path to the templates folder. * @param string $cacheDir The path to the folder that stores the cached files * @param string $lDelim The left delimiter to use in the templates files to mark a template variable. * @param string $rDelim The right delimiter to use in the templates files to mark a template variable. * @param int $defaultExpiryTime The default templates' cache expiry time. * @return void */ public function __construct( $tplDir, $cacheDir, $lDelim='', $rDelim='', $defaultExpiryTime = NULL ) { if (is_null($tplDir) or strlen($tplDir) < 1) exit('Error in <strong>'.__CLASS__.'::'.__FUNCTION__.'</strong> function. The path to the templates\' directory is missing!'); if (is_null($cacheDir) or strlen($cacheDir) < 1) exit('Error in <strong>'.__CLASS__.'::'.__FUNCTION__.'</strong> function. The path to the templates\' cache directory is missing!'); $this->SetTemplatesDirectory($tplDir); $this->SetCacheDirectory($cacheDir); $this->SetLeftDelimiter($lDelim); $this->SetRightDelimiter($rDelim); $this->SetDefaultExpiryTime($defaultExpiryTime); } public function SetDefaultExpiryTime( $defaultCacheExpiryTime = NULL ) { if ( !is_null($defaultCacheExpiryTime) and is_int($defaultCacheExpiryTime) and $defaultCacheExpiryTime > 0) $this->defaultCacheExpiryTime = $defaultCacheExpiryTime; } /** * Set the path to the templates directory. * * @param string $tplDir The path to the templates folder. * @return void */ public function SetTemplatesDirectory( $tplDir ) { $this->tpl_dir = $tplDir; if (is_null($this->tpl_dir) or strlen($this->tpl_dir) < 1) exit('Error in <strong>'.__CLASS__.'::'.__FUNCTION__.'</strong> function. The path to the templates\' directory is missing!'); if ( ! @is_dir($this->tpl_dir)) { exit('The specified template directory <strong>'.$this->tpl_dir.'</strong> was not found!'); $this->tplDir = NULL; } } /** * Set the path to the templates' cache directory. * * @param string $cacheDir The path to the templates' cache directory. * @return void */ public function SetCacheDirectory( $cacheDir ) { $this->cache_dir = $cacheDir; if (is_null($this->cache_dir) or strlen($this->cache_dir) < 1) exit('Error in <strong>'.__CLASS__.'::'.__FUNCTION__.'</strong> function. The path to the templates\' cache directory is missing!'); if ( ! @is_dir($this->cache_dir)) { exit('The specified cache directory <strong>'.$this->cache_dir.'</strong> was not found!'); $this->cache_dir = NULL; } } /** * Set the left delimiter to use in the templates files to mark a template variable. * * @param string $delim The left delimiter to use in the templates files to mark a template variable. * @return void */ public function SetLeftDelimiter( $delim ) { if ( ! empty($delim)) $this->left_delimiter = $delim; } /** * Set the right delimiter to use in the templates files to mark a template variable. * * @param string $delim The right delimiter to use in the templates files to mark a template variable. * @return void */ public function SetRightDelimiter( $delim ) { if ( ! empty($delim)) $this->right_delimiter = $delim; } /** * Add a variable to the vars array. This variable will be replaced in a template. * * @param string $name The name of the variable to store in the vars array. * @param mixed $value The value of the variable. * @return void */ public function SetVar( $name, $value ) { $this->vars[$name] = $value; } /** * Get a variable from the vars array. * * @param string $name The name of the variable to retrieve from the vars array. * @return mixed */ public function GetVar( $name ) { if (isset($this->vars[$name]) and !empty($this->vars[$name])) return $this->vars[$name]; else return ''; } /** * Delete all variables from the vars array. * * @return void */ public function ClearVars() { $this->vars = array(); } /** * Get all variables from the vars array. * * @return array */ public function GetAllVars() { return $this->vars; } /** * Retrieve the content of a template. * * @param string $template The name of the template file to load. * @param int $expires The length of time, in hours, a file should be cached. * Set to 'nocache' when you don't want to cache a template, * @return string The template's html content. */ public function GetTemplate( $template, $expires=NULL ) { // if $expires == 'nocache' the template's content will not be cached if ( !is_null($expires) and $expires == 'nocache') { return $this->Parse($template); } // if $expires > 0 , it will override the default expiry time // if $expires == null , the template's content will be cached using the default expiry time else { if ($expires > 0) // overide the default expiry time $_expires = ($expires *60*60) + time(); else // use default expiry time $_expires = ($this->defaultCacheExpiryTime *60*60) + time(); if ($this->IsCached($template)) { if ($this->HasCacheExpired($template)) { // cache the template again $content = $this->Parse($template); $this->CacheTemplate($template,$content,$_expires); return $content; } // get cached template else return $this->GetCachedFile($template); } else { // cache template $content = $this->Parse($template); $this->CacheTemplate($template,$content,$_expires); return $content; } } } /** * Outputs the template's html content. * * @param string $template The name of the template file to load. * @return string The template file's content. */ public function Display( $template ) { echo $this->GetTemplate($template,'nocache'); } # CACHING METHODS #====================== /** * Delete all templates from the cache directory. * * @return void */ public function EmptyCacheDirectory() { $files = $this->GetCachedFiles(); if (count($files) > 0) { foreach ($files as $file) @unlink($this->cache_dir.DIRECTORY_SEPARATOR.$file); } } /** * Delete a cached template. * * @param string $fileNames The name(s) of the file(s) to delete. * @return void */ public function DeleteCached(/*$fileName, $fileName,...*/) { $files = func_get_args(); if (count($files) > 1) { foreach ($files as $file) { $_file = $this->cache_dir.DIRECTORY_SEPARATOR.$this->SetCacheFileName($file); if (@file_exists($_file)) @unlink($_file); } } } /** * Check to see if the specified file exists in the cache directory. * * @param string $fileName The name of the file to check for existance. * @return boolean */ public function IsCached( $fileName ) { if (empty($fileName)) return FALSE; $file = $this->cache_dir.DIRECTORY_SEPARATOR.$this->SetCacheFileName($fileName); return (file_exists($file) ? TRUE : FALSE); } /** * Get the specified cached file's expire time. * <code> * echo date("l F,Y h:i:s", $tpl->GetCacheExpireTime('header.php')); * </code> * @param string $fileName The name of the file. * @return string */ public function GetCacheExpireTime( $fileName ) { $content = ''; $lines = file($this->cache_dir.DIRECTORY_SEPARATOR.$this->SetCacheFileName($fileName)); $expire_date = trim($lines[0]); $expire_date = substr($expire_date,1,-1); return $expire_date; } # PROTECTED METHODS #====================== /** * Replaces the variables from the specified template file. * * @access protected * @param string $template The name of the template file to load. * @return string The template file's content. */ protected function Parse( $template ) { ob_start(); @include_once $this->tpl_dir.'/'.$template; $content = ob_get_contents(); ob_end_clean(); if (count($this->vars) > 0) { foreach($this->vars as $name=>$value) { if (is_string($value)) { $var = $this->left_delimiter.$name.$this->right_delimiter; $content = str_ireplace($var, $value, $content); } } } return $content; } /** * Cache a template. * * @access protected * @param string $fileName The name of the template to cache. * @param string $fileContent The html/text content of the template file. * @param integer $expires In hours, the length of time the cached template should be kept in the cache folder. * @return void */ protected function CacheTemplate( $fileName, $fileContent, $expires ) { // Create a new cache $name = $this->SetCacheFileName($fileName); $_expires = '['.$expires.']'."\n"; $html_content = htmlentities($fileContent, ENT_QUOTES, 'UTF-8'); $h = fopen($this->cache_dir.DIRECTORY_SEPARATOR.$name,'w'); fwrite($h,$_expires.$html_content,strlen($_expires.$html_content)); fclose($h); } /** * Check to see whether or not a specified cached file has expired. * * @access protected * @param string $fileName The name of the file. * @return boolean */ protected function HasCacheExpired( $fileName ) { $file_expire_date = (int) $this->GetCacheExpireTime($fileName); return ($file_expire_date >= time()) ? FALSE : TRUE; } /** * Set the name for the file to be cached. * * @access protected * @param string $file The name of the template. * @return string */ protected function SetCacheFileName( $file ) { return md5($file); } /** * Get all files from the cache directory. * @access protected * @return array */ protected function GetCachedFiles() { $fileList = array(); $fileCount = 0; if ($dir = @opendir($this->cache_dir)) { while ($file = @readdir($dir)) { array_push($fileList, $file); $fileCount++; } @closedir($dir); } return $fileList; } /** * Get the content of a cached file * * @access protected * @param string $file The name of the template. * @return string */ protected function GetCachedFile( $file ) { $content = ''; $lines = file($this->cache_dir.DIRECTORY_SEPARATOR.$this->SetCacheFileName($file)); $all_lines = count($lines); for ($i=1; $i < $all_lines; $i++) // << except the first line that holds the file's expire time { $content .= html_entity_decode($lines[$i],ENT_QUOTES,'UTF-8'); } return $content; } } // >> END class ?>