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is [not] odd是否为奇，
$a is not odd by $b即($a / $b) % 2 != 0 示例：
{if $smarty.section.outer.index is odd by 2}
odd英文是奇数的意思，也就是说这个能被2整除：
{section name=outer     loop=$FirstName}                                                                                                                                                 {if $smarty.section.outer.index is odd by 2}             {$smarty.section.outer.rownum} . {$FirstName[outer]} {$LastName[outer]}         {else}             {$smarty.section.outer.rownum} * {$FirstName[outer]} {$LastName[outer]}         {/if}         {sectionelse}         none     {/section}
以上摘自smarty自己的demon。而odd则参考如下：
http://zjsky1989.blog.163.com/blog/static/8158784820134632416404/

{if $smarty.section.outer.index is odd by 1}

0 -1 * John
1 -2 . Mary
2 -3 * James
3 -4 . Henry
4 -5 * Tom
5 -6 . Hello
0/1=0  非奇非偶，执行else项

1/1=1  奇数，执行if项

2/1=2  偶数，执行else项

3/1=3  奇数，执行if项

4/1=4 偶数，执行else项

5/1=5 奇数，执行if项
来自：http://www.ithao123.cn/content-4326244.html
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eq相等，
f7Y"Y f3m @,V+Z }4X0 ne、neq不相等，
7C E z R S8P t,i:@ ^0 gt大于，
4d D H4F,Yg;D X)Y0 lt小于，PHPChina 开源社区门户 T f D |(s P9e
gte、ge大于等于，PHPChina 开源社区门户.L | \8i-C n:Q7]
lte、le 小于等于，PHPChina 开源社区门户 L8^ S \;u5_ ^$n/i"D
not非， mod求模。 PHPChina 开源社区门户 i ^ p a S&a
is [not] div by是否能被某数整除，
,B z M E m I w0 is [not] even是否为偶数，PHPChina 开源社区门户;J K H t"g o { I
$a is [not] even by $b即($a / $b) % 2 == 0，PHPChina 开源社区门户#K g P e!?/k$T e k e3F
is [not] odd是否为奇，PHPChina 开源社区门户 c b1^ F F e p7L
$a is not odd by $b即($a / $b) % 2 != 0 示例：

equal/ not equal/ greater than/ less than/ less than or equal/ great than or equal/后面的就不用说了

Smarty 中的 if 语句和 php 中的 if 语句一样灵活易用，并增加了几个特性以适宜模板引擎. if 必须于 /if 成对出现. 可以使用 else 和 elseif 子句. 可以使用以下条件修饰词：eq、ne、neq、gt、lt、lte、le、gte、ge、is even、is odd、is not even、is not odd、not、mod、div by、even by、odd by、==、!=、>、<、<=、>=. 使用这些修饰词时必须和变量或常量用空格格开.

Example 7-11. if statements
例 7-11. if 语句演示

{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" &#124;&#124; $name == "Wilma"}
...
{/if}

{* the following syntax will NOT work, conditional qualifiers
must be separated from surrounding elements by spaces *}
{if $name=="Fred" &#124;&#124; $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}

{* 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}

作者：jackxiang@向东博客 专注WEB应用 构架之美 --- 构架之美，在于尽态极妍 | 应用之美，在于药到病除
地址：https://jackxiang.com/post/1600/
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