php web开发中广泛采取mvc的设计模式，controller传递给view层的数据，必须通过模板引擎才能解析出来。实现一个简单的仅仅包含if，foreach标签，解析$foo变量的模板引擎。
编写template模板类和compiler编译类。代码如下：
<?php namespace foo\base; use foo\base\Object; use foo\base\Compiler; /** * */ class Template extends Object { private $_config = [ 'suffix' => '.php',//文件后缀名 'templateDir' => '../views/',//模板所在文件夹 'compileDir' => '../runtime/cache/views/',//编译后存放的目录 'suffixCompile' => '.php',//编译后文件后缀 'isReCacheHtml' => false,//是否需要重新编译成静态html文件 'isSupportPhp' => true,//是否支持php的语法 'cacheTime' => 0,//缓存时间,单位秒 ]; private $_file;//带编译模板文件 private $_valueMap = [];//键值对 private $_compiler;//编译器 public function __construct($compiler, $config = []) { $this->_compiler = $compiler; $this->_config = array_merge($this->_config, $config); } /** * [assign 存储控制器分配的键值] * @param [type] $values [键值对集合] * @return [type] [description] */ public function assign($values) { if (is_array($values)) { $this->_valueMap = $values; } else { throw new \Exception('控制器分配给视图的值必须为数组!'); } return $this; } /** * [show 展现视图] * @param [type] $file [带编译缓存的文件] * @return [type] [description] */ public function show($file) { $this->_file = $file; if (!is_file($this->path())) { throw new \Exception('模板文件'. $file . '不存在!'); } $compileFile = $this->_config['compileDir'] . md5($file) . $this->_config['suffixCompile']; $cacheFile = $this->_config['compileDir'] . md5($file) . '.html'; //编译后文件不存在或者缓存时间已到期,重新编译,重新生成html静态缓存 if (!is_file($compileFile) || $this->isRecompile($compileFile)) { $this->_compiler->compile($this->path(), $compileFile, $this->_valueMap); $this->_config['isReCacheHtml'] = true; if ($this->isSupportPhp()) { extract($this->_valueMap, EXTR_OVERWRITE);//从数组中将变量导入到当前的符号表 } } if ($this->isReCacheHtml()) { ob_start(); ob_clean(); include($compileFile); file_put_contents($cacheFile, ob_get_contents()); ob_end_flush(); } else { readfile($cacheFile); } } /** * [isRecompile 根据缓存时间判断是否需要重新编译] * @param [type] $compileFile [编译后的文件] * @return boolean [description] */ private function isRecompile($compileFile) { return time() - filemtime($compileFile) > $this->_config['cacheTime']; } /** * [isReCacheHtml 是否需要重新缓存静态html文件] * @return boolean [description] */ private function isReCacheHtml() { return $this->_config['isReCacheHtml']; } /** * [isSupportPhp 是否支持php语法] * @return boolean [description] */ private function isSupportPhp() { return $this->_config['isSupportPhp']; } /** * [path 获得模板文件路径] * @return [type] [description] */ private function path() { return $this->_config['templateDir'] . $this->_file . $this->_config['suffix']; } }
<?php namespace foo\base; use foo\base\Object; /** * */ class Compiler extends Object { private $_content; private $_valueMap = []; private $_patten = [ '#\{\\$([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)\}#', '#\{if (.*?)\}#', '#\{(else if|elseif) (.*?)\}#', '#\{else\}#', '#\{foreach \\$([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)}#', '#\{\/(foreach|if)}#', '#\{\\^(k|v)\}#', ]; private $_translation = [ "<?php echo \$this->_valueMap['\\1']; ?>", '<?php if (\\1) {?>', '<?php } else if (\\2) {?>', '<?php }else {?>', "<?php foreach (\$this->_valueMap['\\1'] as \$k => \$v) {?>", '<?php }?>', '<?php echo \$\\1?>' ]; /** * [compile 编译模板文件] * @param [type] $source [模板文件] * @param [type] $destFile [编译后文件] * @param [type] $values [键值对] * @return [type] [description] */ public function compile($source, $destFile, $values) { $this->_content = file_get_contents($source); $this->_valueMap = $values; if (strpos($this->_content, '{$') !== false) { $this->_content = preg_replace($this->_patten, $this->_translation, $this->_content); } file_put_contents($destFile, $this->_content); } }
我们的控制器就可以调用template中的assign方法进行赋值，show方法进行模板编译了。
/** * [render 渲染模板文件] * @param [type] $file [待编译的文件] * @param [type] $values [键值对] * @param array $templateConfig [编译配置] * @return [type] [description] */ protected function render($file, $values, $templateConfig = []) { $di = Container::getInstance(); //依赖注入实例化对象 $di->template = function () use ($di, $templateConfig) { $di->compiler = 'foo\base\Compiler'; $compiler = $di->compiler; return new \foo\base\Template($compiler, $templateConfig); }; $di->template->assign($values)->show($file); }
Container类如下：