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array_rand() array to string?
$hex = array("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f");

$random_color = array_rand($hex,6);

echo implode($random_color);

echo $hex[$random_color[0]];
echo $hex[$random_color[1]];
echo $hex[$random_color[2]];
echo $hex[$random_color[3]];
echo $hex[$random_color[4]];
echo $hex[$random_color[5]];

$hex = array("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f");
shuffle($hex);

echo sub_str(implode('',$hex),0,6);

printf('%02x%02x%02x',mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));

printf('%06x',mt_rand(0,16777215));

implode('', array_rand(array_flip($hex), 6));

dechex(mt_rand(0, 0xFFFFFF));

$random_color = array_rand(array_flip($hex), 6);

<?php
$hex = array("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f");
shuffle($hex);
echo implode(array_slice($hex, 0, 6));

substr(md5(time()),-6);

substr(md5(uniqid()),-6);

$result = "";
$random_color = array_rand($hex, 6);
foreach ($random_color as $randomIndex) {
  $result = $result . $hex[$randomIndex];
}

$color = '';
while(strlen($c) < 6) {
    $color .= sprintf("%02X", mt_rand(0, 255));
}

mt_srand((double)microtime()*1000000);