模板引擎(smarty)知识点总结三

  阔别了几个月,小杨又来分享php知识。话不多说,言归正传,今天继续带来smarty的知识点。

-----------------smarty  assign append 详解

  对于这两个的区别和联系需要分析smarty的源码-smarty.Class.php

  

     public function assign($tpl_var, $value = null, $nocache = false)
    {
        if (is_array($tpl_var)) {
            foreach ($tpl_var as $_key => $_val) {
                $this->assign($_key, $_val, $nocache);
            }
        } else {
            if ($tpl_var != '') {
                if ($this->_objType == 2) {
                    $this->_assignInScope($tpl_var, $value, $nocache);
                } else {
                    $this->tpl_vars[ $tpl_var ] = new Smarty_Variable($value, $nocache);
                }
            }
        }
        return $this;
    }

 /*
    通过源码的分析得到:如果只传入一个数组,那么数组会循环赋值,等同于 $smarty->assign('lang','php')$smarty->assign('like','yes')
 */

    public function append(Smarty_Internal_Data $data, $tpl_var, $value = null, $merge = false, $nocache = false)
    {
        if (is_array($tpl_var)) {
            // $tpl_var is an array, ignore $value
            foreach ($tpl_var as $_key => $_val) {
                if ($_key != '') {
                    $this->append($data, $_key, $_val, $merge, $nocache);
                }
            }
        } else {
            if ($tpl_var != '' && isset($value)) {
                if (!isset($data->tpl_vars[ $tpl_var ])) {
                    $tpl_var_inst = $data->ext->getTemplateVars->_getVariable($data, $tpl_var, null, true, false);
                    if ($tpl_var_inst instanceof Smarty_Undefined_Variable) {
                        $data->tpl_vars[ $tpl_var ] = new Smarty_Variable(null, $nocache);
                    } else {
                        $data->tpl_vars[ $tpl_var ] = clone $tpl_var_inst;
                    }
                }
                if (!(is_array($data->tpl_vars[ $tpl_var ]->value) ||
                      $data->tpl_vars[ $tpl_var ]->value instanceof ArrayAccess)
                ) {
                    settype($data->tpl_vars[ $tpl_var ]->value, 'array');
                }
                if ($merge && is_array($value)) {
                    foreach ($value as $_mkey => $_mval) {
                        $data->tpl_vars[ $tpl_var ]->value[ $_mkey ] = $_mval;
                    }
                } else {
                    $data->tpl_vars[ $tpl_var ]->value[] = $value;
                }
            }
            if ($data->_objType == 2 && $data->scope) {
                $data->ext->_updateScope->_updateScope($data, $tpl_var);
            }
        }
        return $data;
    }

 

/*
    分析得到:当参数一相同的时候,会产生覆盖,后一个覆盖前一个  解决知道 append 追加
*/
$smarty->append('teacher','冯老师');
$smarty->append('teacher','曾老师');
$smarty->append('teacher','许老师');

/*
        分析源码:可以得出:如果 参数一相同 那么 会组建一个数组(
            $this->tpl_val['teacher'][] = '冯老师' $this->tpl_val['teacher'][] = '曾老师' $this->tpl_val['teacher'][] = '许老师'
        )
*/

posted @ 2017-04-04 17:06  yangboom  阅读(598)  评论(0编辑  收藏  举报
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