ecmall中static变量的使用-model模型代码设计

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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];

}

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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‘));