PHP Ϊʲôfunction
PHP Ϊʲôfunction ÔÚÉùÃ÷ʱûÓÐÉùÃ÷²ÎÊý,¶øµ÷ÓÃʱ¼ÓN¸ö²ÎÊýÈ´ÊÇÔÊÐíµÄ
2008-11-13 20:14:38 ÆäËû | ÆÀÂÛ(7) | ä¯ÀÀ(721)
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//ÉùÃ÷
function test(){};
$a = '';
$b = '';
$c = '';
//µ÷ÓÃ
test($a,$b,$c,1,2,3);
ÏàÐŲ»ÉÙÐֵܽãÃÃÒ²Ôø¾Óöµ½Í¬ÑùµÄÎÊÌâ¡£
why?
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--------------------------------------
PHP supports passing arguments by value (the default), passing by reference, and default argument values. Variable-length argument lists are also supported, see also the function references for func_num_args(), func_get_arg(), and func_get_args() for more information.
---------------------------------------------
ÔÀ´PHPÖ§³Ö±ä³¤²ÎÊýÁÐ±í£¨Variable-length argument lists £©
int func_num_args(void)¿ÉÒԵõ½²ÎÊý³¤¶È
such as:
function test()
{
echo func_num_args();
}
test(0, 1, 2, 3); // ÏÔʾ: 4
mixed func_get_arg(int $arg_num)¿ÉÒԵõ½Ò»¸ö²ÎÊýÖµ
such as:
function test()
{
echo func_get_arg(2);
}
test('a', 'b', 'c'); //ÏÔʾ£ºc
array func_get_args(void) ¿ÉÒԵõ½Ò»×éarray²ÎÊý
such as:
function test()
{
var_dump(func_get_args());
}
test('a', 'b', 'c'); //ÏÔʾ£ºarray(3) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" }
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