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为变量设置默认值。 当变量是unset或者empty的字符串时,默认值将显示。 必须要有一个参数。

参数顺序 类型 必选参数 默认值 说明
1 string No 控制 当变量为空时输出的值

Example 5.9. default


$smarty->assign('articleTitle', 'Dealers Will Hear Car Talk at Noon.');
$smarty->assign('email', '');




{$articleTitle|default:'no title'}
{$myTitle|default:'no title'}
{$email|default:'No email address available'}



Dealers Will Hear Car Talk at Noon.
no title
No email address available


参见 默认变量处理空变量处理

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