PHP compare user input against multiple variables - php

Question

I have 5 variables that generate a random number and a sixth variable which is the users input.
Then I check to see if users input $userNum matches any of the random numbers. I know it's a dumb game, but I'm just messing around to learn more PHP
There has to be an easier way to do this.
if(isset($_POST['submit']))
{
$userNum = $_POST['userNum'];
$spot1 = rand(1, 100);
$spot2 = rand(1, 100);
$spot3 = rand(1, 100);
$spot4 = rand(1, 100);
$spot5 = rand(1, 100);
echo $spot1 ."<br>" .$spot2 ."<br>" .$spot3 ."<br>" .$spot4 ."<br>" .$spot5;
if($userNum == $spot1)
{
echo "you hit a mine!";
exit();
}
if($userNum == $spot2)
{
echo "you hit a mine!";
exit();
}
if($userNum == $spot3)
{
echo "you hit a mine!";
exit();
}
if($userNum == $spot4)
{
echo "you hit a mine!";
exit();
}
if($userNum == $spot5)
{
echo "you hit a mine!";
exit();
} else {
echo "you lived!";
}
}

Answer 1

You don't need to store spots in an array or anything like that just use a simple loop.
<?php
if(isset($_POST['submit'])){
$userNum = (int) $_POST['userNum'];
$hitMine = false;
for($i = 1; $i <= 5; $i++){
$randNum = rand(1, 100);
echo $randNum . '<br />';
if($randNum == $userNum){
$hitMine = true;
}
}
if($hitMine == true){
echo "you hit a mine!";
}
}
?>

Answer 2

I would make an array of the spots
$spot1 = rand(1, 100);
$spot2 = rand(1, 100);
$spot3 = rand(1, 100);
$spot4 = rand(1, 100);
$spot5 = rand(1, 100);
// Make an array of the spots.
$spots = array($spot1, $spot2, $spot3, $spot4, $spot5);
if(in_array($userNum, $spots)) {
echo "you hit a mine!";
exit();
} else {
echo "you lived!";
}
For 50 or more spots you can dynamicaly insert the values in the array assuming you use the rand() function in the real php-code:
$spots = Array();
for ($i = 0; $i < 50; $i ++) {
array_push($spots, rand(1,100));
}
or:
for ($i = 0; $i < 50; $i ++) {
$spots[$i] = rand(1,100);
}

Answer 3

You can use Switch Case in place of if else to make it better and quick.
if(isset($_POST['submit']))
{
$userNum = $_POST['userNum'];
$spot1 = rand(1, 100);
$spot2 = rand(1, 100);
$spot3 = rand(1, 100);
$spot4 = rand(1, 100);
$spot5 = rand(1, 100);
echo $spot1 ."<br>" .$spot2 ."<br>" .$spot3 ."<br>" .$spot4 ."<br>" .$spot5;
Switch($userNum)
{
Case $spot1:
Case $spot2:
Case $spot3:
Case $spot4:
Case $spot5:
echo "you hit a mine!";
break;
default: echo "you lived!";
break;
}
}

Answer 4

Just store the valid spots in an array.
$myhashmap = array();
$myhashmap['spot1'] = true;
$myhashmap['spot2'] = true;
if(isset($myhashmap[$userNum] ) )
{
echo "you hit a mine!";
exit();
}
Here's a link for more info about PHP arrays: http://www.tutorialspoint.com/php/php_arrays.htm