Php不支持的操作数类型

Question

I got this:

$newcw = array_rand( range( 1, 52 ), 15 ) ;
shuffle($newcw);
$year = date("Y");
$time = mktime(0,0,0,1,1,$year) + ($newcw * 7 * 24 * 60 * 60);
$time = $time - ((date('N', $time) - 1) * 24 * 60 * 60);

$startWeek = date('D d-M-Y', $time);
$endWeek = date('D d-M-Y', $time + (6 * 24 * 60 * 60));

So basically I get a random integer which stands for calender week.

I calculate the starting day (monday) and ending day(sunday) of that calender week.

But I get following error:

Fatal error: Unsupported operand types in 88

line 88 would be this line:

$time = mktime(0,0,0,1,1,$year) + ($newcw * 7 * 24 * 60 * 60);

EDIT: I want a random integer which shall not repeats itself, that it why I am trying this method.

Answer 1

If you just want a single value, use regular rand function:

//$newcw = array_rand( range( 1, 52 ), 15 ) ;
//shuffle($newcw);

$newcw = rand(1,52);

http://php.net/manual/en/function.rand.php

If however you actually need to use the other 14 values somewhere later in the script, you can just select the 1st element in the suffled array for this calculation:

$newcw = array_rand( range( 1, 52 ), 15 ) ;
shuffle($newcw);
$year = date("Y");
$time = mktime(0,0,0,1,1,$year) + ($newcw[0] * 7 * 24 * 60 * 60); //<-- note [0]

Then use the other values as required, by incrementing the key each time, eg:

some_func($newcw[1]); 

$val = $newcs[2] + 100; 
//....
another_func($newcw[14];

Answer 2

$newcw是数组，你尝试使用整数$newcw数组，这就是你在这一行得到错误的原因