php Smarty中if,elseif,else用法详解

php smarty模板条件选择结构if-elseif-else，{if}必须和{/if}成对出现，当然也可以使用{else}和{elseif}子句，{if}中可以使用如下修饰词：

if实例

{if} 实例：

{if $name eq 'Fred'}
    Welcome Sir.
{elseif $name eq 'Wilma'}
    Welcome Ma'am.
{else}
    Welcome, whatever you are.
{/if}
{* an example with "or" logic *}
{if $name eq 'Fred' or $name eq 'Wilma'}
   ...
{/if}
{* same as above *}
{if $name == 'Fred' || $name == 'Wilma'}
   ...
{/if}
{* parenthesis are allowed *}
{if ( $amount < 0 or $amount > 1000 ) and $volume >= #minVolAmt#}
   ...
{/if}
{* you can also embed php function calls *}
{if count($var) gt 0}
   ...
{/if}
{* check for array. *}
{if is_array($foo) }
   .....
{/if}
{* check for not null. *}
{if isset($foo) }
   .....
{/if}
{* test if values are even or odd *}
{if $var is even}
   ...
{/if}
{if $var is odd}
   ...
{/if}
{if $var is not odd}
   ...
{/if}
{* test if var is divisible by 4 *}
{if $var is div by 4}
   ...
{/if}
{*
  test if var is even, grouped by two. i.e.,
  0=even, 1=even, 2=odd, 3=odd, 4=even, 5=even, etc.
*}
{if $var is even by 2}
   ...
{/if}
{* 0=even, 1=even, 2=even, 3=odd, 4=odd, 5=odd, etc. *}
{if $var is even by 3}
   ...
{/if}

if elseif 实例：

{if isset($name) && $name == 'Blog'}
     {* do something *}
{elseif $name == $foo}
    {* do something *}
{/if}
{if is_array($foo) && count($foo) > 0}
    {* do a foreach loop *}
{/if}

实例

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     {foreach from=$users item=row}
          
            {foreach from=$row item=col key=k}
            {* 注意if语句与小括号(不是必须的)之间的空格，有严格的要求 *}
              
            {/foreach}
            
            {foreachelse}
          
      {/foreach}
{$k}:{$col}
没有数据啊

程序为$users变量赋值为如下数组：

array(    
       array('name' => 'wjj','age' => '保密'),
    array('name' => 'qxy','age' => '好像比我小')
)