[SOLVED] calculating a percent chance

[kryppienation]

Hi guys I'm having a little bit of trouble figuring out how to calculate a percent chance of something happening. I am wondering if someone would help me figure out how to get this little script to display something on a percent chance.

 

All i want this to do is display $action1 based on the percentage in $percentage, otherwise $action2. In this example i would like it to display "Battle" 100% of the time, but i need this number to be able to change to any percent between 0 and 100. Like if i change it to 35, i would like there to be a 35% chance "Battle" will pop up and a 65% chance that "Nothing" will pop up. Thanks to anyone who can help me with this. ???

 

<?php

$action1 = "Battle";
$action2 = "Nothing";
$percentage = 100;  //this should be able to be changed between zero and one hundred percent chance of, for test purpose i want $action1 to show 100% of the time, otherwise show $action2

$loop = 1;

while ($loop <= 100){





echo "looping $loop <br>" ;


$loop++;


}





?>

 

 

[Dathremar]

$percentage = rand( 0, 100);

 

That will be a random number between 1 and 100. And if You want that percentage to be changing according to some rules or conditions then tell us what.

[kryppienation]

no i mean i know how to make a random number, for now i just want that number to be 100 percent. What i'm trying to do is simply have this script display results based on a percent chance. In this new one i have it displaying 25, but the end result is not 25 battles and 75 nothings.

 

<?php

$action1 = "Battle";
$action2 = "Nothing";
$percentage = 25;  //this should be able to be changed between zero and one hundred percent chance of, for test purpose i want $action1 to show 100% of the time, otherwise show $action2

$loop = 1;
$act1c = 0;
$act2c = 0;

while ($loop <= 100){

//pick a random number
$randomnumber = rand(0, 100);

if($randomnumber <= $percentage){

$action = $action1;
$act1c++;

} else {

$action = $action2;
$act2c++;

}



echo "looping $loop - $action <br>" ;


$loop++;


}

echo "total battles = $act1c | total nothing = $act2c";



?>

 

 

here are some of the results:

 

Battles, Nothings

35, 65

28, 72

21, 79

29, 71

30, 70

26, 74

 

 

 

[Dathremar]

Hmm If i get You right

 

$percentage = 25;  // Put here the random number for dynamic percentage
$act1c = 0;
$act2c = 0;

for ($i = 1; $i <= $percentage; $i++){
$action = $action1;
$act1c++;
}

for ($j = $percentage; $j <= 100; $j++){
$action = $action2;
$act2c++;
}

 

Is this better or I am still missing the point :S

 

[kryppienation]

honestly, because i'm using random numbers, i don't think it's possible to get the results that i originally intended, even though it doesnt even out correctly out of the 100 echo's, it's still only doing 25%? i dunno, this is what i ended up going with.

 

<?php

$loop2 = 1;
$act3c = 0;
$act4c = 0;
$randompercent = rand(12, 49); //chance of battle
while($loop2 <= 100){


if(rand(1, 100) <= $randompercent){

echo "looping $loop2 - Battle <br>";
$act3c++;
}else{

echo "looping $loop2 - Nothing <br>";
$act4c++;
}

$loop2++;
}
echo "total battles = $act3c | total nothing = $act4c | true battle percent $randompercent <p>";
?>