The example in this article describes the php variable length parameter processing function. Share it with everyone for your reference, the details are as follows:
Like C++, functions containing variable parameters can also be processed in PHP. The principle is the same, and a function is needed to specifically process the parameter list. PHP provides three related functions:
1. func_num_args() -- Returns the number of parameters passed to the function
int func_num_args ( void )
Example:
function open_database($DB, $cache_size_or_values=null, $cache_size=null)
{
switch (function_num_args())
{
case 1:
$r = select_db($DB);
break;
case 2:
$r = select_db($DB, $cache_size_or_values);
break;
case 3:
$r = select_db($DB, $cache_size_or_values, $cache_size);
break;
}
return is_resource($r);
}##2. func_get_arg() -- Return the specified parameter
mixed func_get_arg (int arg_num)
<?php
function some_func($a, $b)
{
for($i = 0; $i<func_num_args(); ++$i)
{
$param = func_get_arg($i);
echo "the param is $param\n"
}
}
some_func(1,3,5,7,9);
?>
3. func_get_args() -- Returns the parameter list in the form of an array
array func_get_args ( void )
<?php
function some_other_func($a, $b)
{
$param = func_get_args();
$param = join(", ", $param); // 分解显示
echo "the arglist is: $param\n";
}
some_other_func(1,3,5,7,9);
?>
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