php模板引擎技术容易实现

php模板引擎技术简单实现

用了smarty,tp过后，也想了解了解其模板技术是怎么实现，于是写一个简单的模板类，大致就是读取模板文件->替换模板文件的内容->保存或者静态化

 

tpl.class.php主要解析

　　assign 方法实现

<span style="color: #008000;">        /*</span><span style="color: #008000;">*          * 模板赋值操作          * @param mixed $tpl_var 如果是字符串,就作为数组索引,如果是数组，就循环赋值          * @param mixed $tpl_value 当$tpl_var为string时的值,默认为 null          </span><span style="color: #008000;">*/</span>        <span style="color: #0000ff;">public</span> function assign($tpl_var,$tpl_value=<span style="color: #0000ff;">null</span><span style="color: #000000;">){            </span><span style="color: #0000ff;">if</span>(is_array($tpl_var) && count($tpl_var) > <span style="color: #800080;">0</span><span style="color: #000000;">){                </span><span style="color: #0000ff;">foreach</span> ($tpl_var <span style="color: #0000ff;">as</span> $k =><span style="color: #000000;"> $v) {                    $</span><span style="color: #0000ff;">this</span>->tpl_vars[$k] =<span style="color: #000000;"> $v;                }            }elseif($tpl_var){                $</span><span style="color: #0000ff;">this</span>->tpl_vars[$tpl_var] =<span style="color: #000000;"> $tpl_value;            }        }</span>

fetch 方法实现

         <span style="color: #008000;">/*</span><span style="color: #008000;">*           * 生成编译文件           * @param string $tplFile 模板路径           * @param string $comFile 编译路径           * @return string          </span><span style="color: #008000;">*/</span>        <span style="color: #0000ff;">private</span><span style="color: #000000;"> function fetch($tplFile,$comFile){            </span><span style="color: #008000;">//</span><span style="color: #008000;">判断编译文件是否需要重新生成(编译文件是否存在或者模板文件修改时间大于编译文件的修改时间)</span>            <span style="color: #0000ff;">if</span>(!file_exists($comFile) || filemtime($tplFile) ><span style="color: #000000;"> filemtime($comFile)){                </span><span style="color: #008000;">//</span><span style="color: #008000;">编译,此处也可以使用ob_start()进行静态化</span>                $content = $<span style="color: #0000ff;">this</span>-><span style="color: #000000;">tplReplace(file_get_contents($tplFile));                file_put_contents($comFile, $content);            }        }            </span>

简单编译方法：按照规则进行正则替换

        <span style="color: #008000;">/*</span><span style="color: #008000;">*          * 编译文件          * @param string $content 待编译的内容          * @return string          </span><span style="color: #008000;">*/</span>        <span style="color: #0000ff;">private</span><span style="color: #000000;"> function tplReplace($content){            </span><span style="color: #008000;">//</span><span style="color: #008000;">转义左右定界符 正则表达式字符</span>            $left = preg_quote($<span style="color: #0000ff;">this</span>->left_delimiter,<span style="color: #800000;">'</span><span style="color: #800000;">/</span><span style="color: #800000;">'</span><span style="color: #000000;">);            $right </span>= preg_quote($<span style="color: #0000ff;">this</span>->right_delimiter,<span style="color: #800000;">'</span><span style="color: #800000;">/</span><span style="color: #800000;">'</span><span style="color: #000000;">);            </span><span style="color: #008000;">//</span><span style="color: #008000;">简单模拟编译 变量</span>            $pattern =<span style="color: #000000;"> array(                    </span><span style="color: #008000;">//例如</span><span style="color: #008000;">{$test}</span>                    <span style="color: #800000;">'</span><span style="color: #800000;">/</span><span style="color: #800000;">'</span>.$left.<span style="color: #800000;">'</span><span style="color: #800000;">\$([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)</span><span style="color: #800000;">'</span>.$right.<span style="color: #800000;">'</span><span style="color: #800000;">/i</span><span style="color: #800000;">'</span><span style="color: #000000;">                );            $replace </span>=<span style="color: #000000;"> array(                    </span><span style="color: #800000;">'</span><span style="color: #800000;"><?php echo $this->tpl_vars[\'${1}\']; ?></span><span style="color: #800000;">'</span><span style="color: #000000;">                );            </span><span style="color: #008000;">//</span><span style="color: #008000;">正则处理</span>            <span style="color: #0000ff;">return</span><span style="color: #000000;"> preg_replace($pattern, $replace, $content);        }</span>

display = fetch+echo

        <span style="color: #008000;">/*</span><span style="color: #008000;">*          * 输出内容          * @param string $fileName 模板文件名          </span><span style="color: #008000;">*/</span>        <span style="color: #0000ff;">public</span><span style="color: #000000;"> function display($fileName){            </span><span style="color: #008000;">//</span><span style="color: #008000;">模板路径</span>            $tplFile = $<span style="color: #0000ff;">this</span>->template_dir.<span style="color: #800000;">'</span><span style="color: #800000;">/</span><span style="color: #800000;">'</span><span style="color: #000000;">.$fileName;            </span><span style="color: #008000;">//</span><span style="color: #008000;">判断模板是否存在</span>            <span style="color: #0000ff;">if</span>(!<span style="color: #000000;">file_exists($tplFile)){                $</span><span style="color: #0000ff;">this</span>->errorMessage = <span style="color: #800000;">'</span><span style="color: #800000;">模板文件不存在</span><span style="color: #800000;">'</span><span style="color: #000000;">;                </span><span style="color: #0000ff;">return</span> <span style="color: #0000ff;">false</span><span style="color: #000000;">;            }            </span><span style="color: #008000;">//</span><span style="color: #008000;">编译后的文件</span>            $comFile = $<span style="color: #0000ff;">this</span>->compile_dir.<span style="color: #800000;">'</span><span style="color: #800000;">/</span><span style="color: #800000;">'</span>.md5($fileName).<span style="color: #800000;">'</span><span style="color: #800000;">.php</span><span style="color: #800000;">'</span><span style="color: #000000;">;            $</span><span style="color: #0000ff;">this</span>-><span style="color: #000000;">fetch($tplFile,$comFile);            <br>　　　　　　　include $comFile;        }</span>

 

其他属性

<span style="color: #008000;">        //</span><span style="color: #008000;">模板文件存放位置</span>        <span style="color: #0000ff;">private</span> $template_dir = <span style="color: #800000;">'</span><span style="color: #800000;">templates</span><span style="color: #800000;">'</span><span style="color: #000000;">;         </span><span style="color: #008000;">//</span><span style="color: #008000;">编译文件存放位置</span>        <span style="color: #0000ff;">private</span> $compile_dir = <span style="color: #800000;">'</span><span style="color: #800000;">compiles</span><span style="color: #800000;">'</span><span style="color: #000000;">;        </span><span style="color: #008000;">//</span><span style="color: #008000;">左定界符</span>        <span style="color: #0000ff;">private</span> $left_delimiter = <span style="color: #800000;">'</span><span style="color: #800000;">{</span><span style="color: #800000;">'</span><span style="color: #000000;">;        </span><span style="color: #008000;">//</span><span style="color: #008000;">右定界符 </span>        <span style="color: #0000ff;">private</span> $right_delimiter = <span style="color: #800000;">'</span><span style="color: #800000;">}</span><span style="color: #800000;">'</span><span style="color: #000000;">;         </span><span style="color: #008000;">//</span><span style="color: #008000;">内部临时变量，存储用户赋值</span>        <span style="color: #0000ff;">private</span> $tpl_vars =<span style="color: #000000;"> array();        </span><span style="color: #008000;">//</span><span style="color: #008000;">错误信息</span>        <span style="color: #0000ff;">private</span> $errorMessage = <span style="color: #800000;">''</span><span style="color: #000000;">;        </span><span style="color: #008000;">/*</span><span style="color: #008000;">*          * 修改类属性的值          * @param array $configs 需要修改的相关属性及值          * @return bool          </span><span style="color: #008000;">*/</span>        <span style="color: #0000ff;">public</span><span style="color: #000000;"> function setConfigs(array $configs){            </span><span style="color: #0000ff;">if</span>(count($configs) > <span style="color: #800080;">0</span><span style="color: #000000;">){                </span><span style="color: #0000ff;">foreach</span> ($configs <span style="color: #0000ff;">as</span> $k =><span style="color: #000000;"> $v) {                    </span><span style="color: #0000ff;">if</span>(isset($<span style="color: #0000ff;">this</span>-><span style="color: #000000;">$k))                        $</span><span style="color: #0000ff;">this</span>->$k =<span style="color: #000000;"> $v;                }                </span><span style="color: #0000ff;">return</span> <span style="color: #0000ff;">true</span><span style="color: #000000;">;            }            </span><span style="color: #0000ff;">return</span> <span style="color: #0000ff;">false</span><span style="color: #000000;">;        }</span>

 

 

测试

模板文件 testTpl.html

"<span style="color: #800000;">en</span><span style="color: #800000;">"</span>>    <meta charset="<span" style="color: #800000;">"<span style="color: #800000;">UTF-8</span><span style="color: #800000;">"</span>>    <title>test_tpl_demo</title><span style="color: #000000;">    {$name}:{$age}:{$message}</span>

运行文件 test_tpl.php

<span style="color: #000000;">php    require </span><span style="color: #800000;">'</span><span style="color: #800000;">Tpl.class.php</span><span style="color: #800000;">'</span><span style="color: #000000;">;        $tpl </span>= <span style="color: #0000ff;">new</span><span style="color: #000000;"> Tpl();    $tplarr </span>=<span style="color: #000000;"> array(            </span><span style="color: #800000;">'</span><span style="color: #800000;">name</span><span style="color: #800000;">'</span>=><span style="color: #800000;">'</span><span style="color: #800000;">waited</span><span style="color: #800000;">'</span><span style="color: #000000;">,            </span><span style="color: #800000;">'</span><span style="color: #800000;">age</span><span style="color: #800000;">'</span>=><span style="color: #800000;">'</span><span style="color: #800000;">100</span><span style="color: #800000;">'</span><span style="color: #000000;">        );    $tpl</span>-><span style="color: #000000;">assign($tplarr);    $tpl</span>->assign(<span style="color: #800000;">'</span><span style="color: #800000;">message</span><span style="color: #800000;">'</span>,<span style="color: #800000;">'</span><span style="color: #800000;">this is a demo</span><span style="color: #800000;">'</span><span style="color: #000000;">);    $tpl</span>->display(<span style="color: #800000;">'</span><span style="color: #800000;">testTpl.html</span><span style="color: #800000;">'</span><span style="color: #000000;">);</span>?>

输出：waited:100:this is a demo

生成编译文件：972fa4d270e295005c36c1dbc7e6a56c.php