标签：des c style class blog code
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function &m($model_name, $params
= array(), $is_new = false){ <span style="background-color: rgb(255, 0, 0);">static
$models = array();</span> $model_hash = md5($model_name . var_export($params, true)); if
($is_new || !isset($models[$model_hash])) { $model_file = ROOT_PATH . ‘/includes/models/‘
. $model_name . ‘.model.php‘; if
(!is_file($model_file)) { /* 不存在该文件，则无法获取模型 */ return
false; } include_once($model_file); $model_name = ucfirst($model_name) . ‘Model‘; if
($is_new) { return
new $model_name($params, db()); } $models[$model_hash] = new
$model_name($params, db()); } print_r($models[$model_hash]); return
$models[$model_hash];}/** * 获取一个业务模型 * * @param string $model_name * @param array $params * @param bool $is_new * @return object */function &bm($model_name, $params
= array(), $is_new = false){ <span style="background-color: rgb(255, 0, 0);">static
$models = array();</span> $model_hash = md5($model_name . var_export($params, true)); if
($is_new || !isset($models[$model_hash])) { $model_file = ROOT_PATH . ‘/includes/models/‘
. $model_name . ‘.model.php‘; if
(!is_file($model_file)) { /* 不存在该文件，则无法获取模型 */ return
false; } include_once($model_file); $model_name = ucfirst($model_name) . ‘BModel‘; if
($is_new) { return
new $model_name($params, db()); } $models[$model_hash] = new
$model_name($params, db()); } return
$models[$model_hash];} |
使用static变量，当程序退出这段代码的时候，$model并不消失。这样减少了对象建时内存的消耗，有点类似单例模式。
比如这一段代码：
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class
Model{ function __construct() { echo ‘construct‘.‘<br>‘; }}function &m($model_name, $params
= array(), $is_new = false){ static
$models = array(); $model_hash = md5($model_name . var_export($params, true)); if
($is_new || !isset($models[$model_hash])) { $model_name = ucfirst($model_name) . ‘Model‘; if
($is_new) { return
new Model(); } $models[$model_hash] = new
Model(); } return
$models[$model_hash];}$s = m(‘db‘, array(‘name‘));$s1 = m(‘db‘, array(‘name‘)); |
只执行了一次新建过程。
ecmall中static变量的使用-model模型代码设计,布布扣,bubuko.com
ecmall中static变量的使用-model模型代码设计
标签：des c style class blog code
原文地址：http://www.cnblogs.com/z497688734/p/3767411.html
