PHP Calculation, break point, and reset value in foreach loop - php

Question

How do you calculate (sum) + a value in foreach loop?
I am working on a cricket application where i have to count the loop for each 6 times and then count specific value and then echo the total.
I have a code not exact but something like this.
And there are two values:
Balls $balls['1']; array like 1,2,3,4,5 and up to 300-1000 balls
Runs $balls['6']; array like 2,3,1,5 random numbers could be any;
Values comes from mysql table columns balls and runs
foreach( $balls as $ball ){
$countball++;
// here is what i need to know how do i calculate the values of $ball + $ball?
// so i can echo it inside the below if condition?
$runs = $ball['runs'] + $ball['runs']; // not working
if($countball == 6){
echo $runs;
}
$runs+= $ball; // reset the ball counting to continue addition from loop?
// and reset the
}// end foreach
however something like this works fine for the first $countball == 6. but after that it does not show the exact value

Answer 1

You forget to reset the $countball.
You may change the if part as :
if($countball == 6)
{
echo $runs;
$countball = 0;
}

Answer 2

Maybe this is what you need:
$runs = 0;
foreach( $balls as $ball ){
$runs += $ball['runs'];
}
echo $runs;

Answer 3

With help of #Barmar from above i got the desired output as followings
$runs = 0;
$countball=0;
foreach( $balls as $ball ){
$countball++;
$runs += $ball['runs'];
if($countball == 6){
// reset runs from current loop runs for next, if i reset $runs = 0
// for some reason it does not (SUM) + this loops $ball['runs'] with last 5;
$runs = $ball['runs'];
$countball=0;
}// end if $countball == 6
}// end foreach
echo $runs;