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【smarty】smarty模板中如何生成随机数

Jun 06, 2016 pm 08:09 PM
smarty how template generate random number

如果要在 smarty模板中生成随机数,该如何办呢?在 php文件中生成然后赋值到模板中。这个当然绝对是可行的,但过于复杂,下面作者就如何直接在 smarty模板中生成随机数这个小技巧和大家分享一下。 现在假设在 smarty模板中需要生成一个125-324之间的随机数,

如果要在 smarty模板中生成随机数,该如何办呢?在 php文件中生成然后赋值到模板中。这个当然绝对是可行的,但过于复杂,下面作者就如何直接在 smarty模板中生成随机数这个小技巧和大家分享一下。
现在假设在 smarty模板中需要生成一个125-324之间的随机数,那么可以按如下写法:

{math equation=rand(125,324)}

这样就实现了我们的目的了,怎么样?是不是很简单,其实这里主要用到了smarty模板中的math函数,下面对smarty math函数的作用以及用法做个简要的讲解。

math 允许模板设计者在模板中进行数学表达式运算. 均表达式中可以使用任何数值类型的变量,结果在 math 标签的位置输出. 表达式中使用的变量被当做参数传递给函数,可以是模板变量或静态值. 目前可以使用的运算符有:+, -, /, *, abs, ceil, cos, exp, floor, log, log10, max, min, pi, pow, rand, round, sin, sqrt, srans 和 tan .关于数学函数的详细信息,请查看 PHP 文档。

如果指定了 “assign” 这个特殊属性,该函数的输出值将被赋给由 assign 指定的模板变量,而不是直接输出。

不过需要注意的是: 由于使用了 php 的 eval() 函数,math 函数的执行效率不高. 在 PHP 中做数学运算效率会更高一些,因此要尽可能在 PHP 中做数学运算,将结果赋给模板变量。

smarty math 函数演示

{* $height=4, $width=5 *}

{math equation=”x + y” x=$height y=$width}

输出结果:9

{* $row_height = 10, $row_width = 20, #col_div# = 2, assigned in template *}

{math equation=”height * width / division”
height=$row_height
width=$row_width
division=#col_div#}

输出结果:100

{math equation=”(( x + y ) / z )” x=2 y=10 z=2}

输出结果:6

{math equation=”x + y” x=4.4444 y=5.0000 format=”%.2f”}

输出结果:9.44

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