(转载)http://www.cnitblog.com/neatstudio/archive/2006/07/21/13990.html
今天在群里面,有个叫lewis的在问call_user_func_array的用法,因为之前一直没有用过,也不能说什么,于是看一下手册,发现是这么写的:
call_user_func_array
(PHP 4 >= 4.0.4, PHP 5)
call_user_func_array -- Call a user function given with an array of parametersDescription
mixed call_user_func_array ( callback function, array param_arr )Call a user defined function given by function, with the parameters in param_arr.
然后还有一个例子:
相信看了例子之后应该有点明白了吧?
我自己是这么理解这个函数的,如果说的不对,还望各位高手不要耻笑:
该函数真正的用法有点类似于函数重载,因为他的第一个参数是字符型的,也就是函数的名称,第二个参数是数组,我们可以当成该函数的各个参数,而事实上也就是这么用的,如果你看过我的前一篇文章:PHP的伪重载 ,或许你能够理解,正是因为这个函数的存在,我发现函数重载也可以这样运用:
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/**
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* 例子写完后,本来认为完事了,结果遇到有人问call_user_func_array(),看了一下手册
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* 原来,我上面的那个test函数还可以精简成如下的例子,
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*/
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function otest1 ($a)
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{
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echo( '一个参数' );
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}
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function otest2 ( $a, $b)
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{
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echo( '二个参数' );
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}
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function otest3 ( $a ,$b,$c)
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{
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echo( '三个啦' );
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}
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function otest ()
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{
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$args = func_get_args();
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$num = func_num_args();
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call_user_func_array( 'otest'.$num, $args );
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}
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otest(1,2);
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看到不?而我最初的写法,在PHP的伪重载一文中有所提及,仅作参考。。。。
这些只是call_user_func_array的简易用法,在PHP4下测试过,而手册中还有一些将第一个参数当成数组来传入的例子,我在PHP4下是没有办法运行的,也许PHP5可以吧,但我不用PHP5的,也没有办法解释什么。谢谢各位