探讨Smarty中如何获取数组的长度以及smarty调用php函数的详解
Smarty中如何获取数组的长度
前提假设:
分配了一个数组array给Smarty,假设Smarty的分界符为'{' 和'}'。
在很多资料上都看到,在Smarty中要求数组的长度时,可以用在数组后便加|count的方法调用。即通过{array|count}获得array的长度。但是今天在写模板时,发现这样得不到数组的长度,而只是得到一个返回的字符串Array。也就是说仅仅是返回了{array}的结果,而没有返回其array的长度。
查看smarty\plugins文件夹,发现并没有count的相关方法,也就是说,count是直接调用了php中的方法。
后来通过网络上的资料,发现可以在count前面加@,从而正确的获取数组的长度。再进一步查看Smarty的源码,发现Smarty对属性调节器后边的方法名进行处理时,会对前边加@的进行特殊处理。因此作出判断:在Smarty中的属性调节器中调用php中定义好的函数时,可以通过加@来表示。
1、对类型为数组的方法进行测试时,发现不加@符号都会出错。比如:要对一个数组调用count方法求出数组的长度,就可以这样调用{array|@count},而要对数组调用end方法得出数组的最后一组数据时,则可以通过{array|@end}。
2、在对字符串的相关函数进行测试,发现加不加@都可以正常的调用。
3、其他的尚未认真测试。对于在smarty中调用复杂的php函数不予鼓励,因为Smarty的本意就是要实现代码和模板分离,应该认定模板就是界面设计的人员用的,如果过多地加复杂逻辑,对他们来说就是一种折磨了。

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