How should I write the following code correctly?

How to write the following code correctly? $ a & nbsp ;=& nbsp; "'000000', '000000', '000000', '000000', '000000 ', '000000', '000000', '000000', '000000', '000000', '000000' "; echo & nbsp; $; srand (float) & nbsp; how should I write the following code correctly?

$a = "'111','222','333','1111','2222','3333','1112','2221','33313','1114','2225','3336'";

echo $a;
srand((float) microtime() * 10000000);
$input = array($a);
$rand_keys = array_rand($input, 10);
echo $input[$rand_keys[0]].','.$input[$rand_keys[1]].','.$input[$rand_keys[2]].','.$input[$rand_keys[2]].','.$input[$rand_keys[4]].','.$input[$rand_keys[5]].','.$input[$rand_keys[6]].','.$input[$rand_keys[7]].','.$input[$rand_keys[8]].','.$input[$rand_keys[9]];

srand((float) microtime() * 10000000);
$input = array('111','222','333','1111','2222','3333','1112','2221','33313','1114','2225','3336');
$rand_keys = array_rand($input, 10);
echo $input[$rand_keys[0]].','.$input[$rand_keys[1]].','.$input[$rand_keys[2]].','.$input[$rand_keys[2]].','.$input[$rand_keys[4]].','.$input[$rand_keys[5]].','.$input[$rand_keys[6]].','.$input[$rand_keys[7]].','.$input[$rand_keys[8]].','.$input[$rand_keys[9]];

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