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

{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 *}

{$k}:{$col}

{/foreach}

{foreachelse}

没有数据啊

{/foreach}

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')

)