PHP function variable number of parameter lists

This article introduces you to the variable number of parameter lists of PHP functions. Friends in need can refer to

PHP5.5 and earlier versions

Use the following Function:

• func_num_args Returns the total number of parameters

• ##func_get_arg Returns a certain number in the parameter list One item

• func_get_args Returns an array containing the function argument list

function test()
{
    echo '参数总数；', func_num_args(), "\n";
    echo '第一个参数：', func_get_arg(0), "\n";
    echo '全部参数；';
    print_r(func_get_args());
}

test(1, 2, 3, 4);

/*
参数总数；4
第一个参数：1
全部参数；Array
(
   [0] => 1
   [1] => 2
   [2] => 3
   [3] => 4
)
*/

PHP5.6 and above

Use

... syntax implementation

function test(...$params)
{
    print_r($params);
}

test(1, 2, 3, 4);

/*
Array         
(             
    [0] => 1  
    [1] => 2  
    [2] => 3  
    [3] => 4  
)
*/

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