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PHP - Probability By The Thousandths Of Percent
Stupid Question, and it might even be as simple as adding a zero, but I cannot figure it out.
$prob = number_format(mt_rand(1,100)/100, 2) ;
$q = $db->query("SELECT * FROM rpg_monsters
WHERE monster_zone = 1 AND chance >= $prob
ORDER BY chance,rand()
LIMIT 1");
As you can see this works out perfectly. But only one issue. I want that 0.05 to be in the thousandths of percent: 0.005%. So it's a higher probability.
But if I change it to 0.005, it never shows, even with iterations over 5000 in a for loop? I feel like I need to do something with my mt_rand? I need to simply move a decimal over someplace, but not sure where.
Edited by Monkuar, 12 October 2014 - 08:30 PM. Similar TutorialsHere is my code:
//Grab all the monster in Monster zone 1
$q = $db->query('SELECT * from rpg_monsters where monster_zone = 1');
while ($monsterdata = $db->fetch_assoc($q))
{
$monster_chance[] = $monsterdata;
}
and my var_dump:
array (size=4) 0 => array (size=8) 'monster_id' => string '1' (length=1) 'monster_name' => string 'Merman' (length=6) 'monster_level' => string '1' (length=1) 'monster_type' => string 'Normal' (length=6) 'monster_hp' => string '10' (length=2) 'monster_dmg' => string '1' (length=1) 'monster_zone' => string '1' (length=1) 'chance' => string '0.10' (length=4) 1 => array (size=8) 'monster_id' => string '2' (length=1) 'monster_name' => string 'Chris Wilson' (length=12) 'monster_level' => string '2' (length=1) 'monster_type' => string 'Unique' (length=6) 'monster_hp' => string '25' (length=2) 'monster_dmg' => string '3' (length=1) 'monster_zone' => string '1' (length=1) 'chance' => string '0.04' (length=4) 2 => array (size=8) 'monster_id' => string '3' (length=1) 'monster_name' => string 'Seaman Warrior' (length=14) 'monster_level' => string '2' (length=1) 'monster_type' => string 'Magic' (length=5) 'monster_hp' => string '20' (length=2) 'monster_dmg' => string '2' (length=1) 'monster_zone' => string '1' (length=1) 'chance' => string '0.10' (length=4) 3 => array (size=8) 'monster_id' => string '4' (length=1) 'monster_name' => string 'Goblin Attacker' (length=15) 'monster_level' => string '2' (length=1) 'monster_type' => string 'Normal' (length=6) 'monster_hp' => string '15' (length=2) 'monster_dmg' => string '2' (length=1) 'monster_zone' => string '1' (length=1) 'chance' => string '0.10' (length=4)As you can see, the Unique Monster (Chris Wilson) is the lowest chance at only 4%. And all the other mobs at at 10% chance to spawn. Here is my code for probability:
$rate = (double) '0.03'; // 3%
$max = 1 / $rate; // 100
if (mt_rand(0, $max) === 0) {
// chance < $rate
echo "Only 3% probability, holy cow!";
}
My problem is, I'm a bit lost as how to get my probability code inside a loop and having the dynamic $rate correspond to my "chance" row.
Although, I could just use ORDER BY rand() in mysql, it wouldn't let me use any probability and chances... hmmm
Edited by Monkuar, 12 October 2014 - 11:12 AM. Hey, I have a question about doing a % in PHP.. So say a user in my database has a cash amount of $20.00. Their referrer is going to get 20% of that. How would I calculate that in PHP? Hi, Example: echo percent(5, 10, 2)."%"; gives you 50% Instead of this representation, I want to use a bar like this: So what ever percentage it is, it will show on the bar. (out of 100%) anyone help me achieve this please? Thanks Code: [Select] function percent($sub, $total, $dec) { if ($sub) { $perc = $sub / $total * 100; $perc = round($perc, $dec); return $perc; } else return 0; } Hi. I am brand new here... I have a script where I'm trying to parse an email and everything is working fine but it looks like the percent sign (%) is getting stripped out of my message. The percent sign is in the subject message and it gets removed and I also can't use it in any other strings in the script. I've tried just adding a slash in front like \% but that didn't fix it. Is there another way to escape a percent sign when using it in a script? Any help is appreciated. Thanks. -Jeff |
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