Smarty中{if},{elseif},{else}条件用法介绍

时间：2022-06-25 00:59:38 编辑：袖梨来源：一聚教程网

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

Example 7.15. {if} statements

代码如下

复制代码

{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：

代码如下

复制代码

{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

代码如下

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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：

代码如下

复制代码

array(
array('name' => 'wjj','age' => '保密'),

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

)

参考

Qualifier	Alternates	Syntax Example	Meaning	PHP Equivalent
==	eq	$a eq $b	equals	==
!=	ne, neq	$a neq $b	not equals	!=
>	gt	$a gt $b	greater than	>
<	lt	$a lt $b	less than	<
>=	gte, ge	$a ge $b	greater than or equal	>=
<=	lte, le	$a le $b	less than or equal	<=
===		$a === 0	check for identity	===
!	not	not $a	negation (unary)	!
%	mod	$a mod $b	modulous	%
is [not] div by		$a is not div by 4	divisible by	$a % $b == 0
is [not] even		$a is not even	[not] an even number (unary)	$a % 2 == 0
is [not] even by		$a is not even by $b	grouping level [not] even	($a / $b) % 2 == 0
is [not] odd		$a is not odd	[not] an odd number (unary)	$a % 2 != 0
is [not] odd by		$a is not odd by $b	[not] an odd grouping	($a / $b) % 2 != 0

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