I don't understand for loop in PHP,
`$total = 0;
for ($i = 1; $i <= 10; $i++) {
$total += $i;
}
echo $total;`
normally equal an 11 no ? he output me 55, but for python when you execute similar code with "while loop"
total = 0
while total <= 10:
total+=1
print(total)
output me 11
please someone can help me?
Your PHP and python code is not equivalent. In python you just add 1 each time in the loop. However in the PHP you are adding the value to the $i value, which of course keeps increasing every time - i.e. 1+2+3+3+5...etc.
You could write
$total += 1;
or just
$total++;
instead and it would work the same as the python. But then again that makes $total redundant because it just has the same value as $i, and you don't really need two variables doing the same job.
Or you could write a while loop to be more directly equivalent to the python:
$total = 0;
while ($total <=10) {
$total++;
}
echo $total;
In the PHP code, you get the sum of 1 to 10 numbers using for loop. That is, 0+1+2+3+4+5+6+7+8+9+10 = 55
Because you have initially given 0 to the $total variable in the PHP code. Then you have given 1 to the $i variable in the for loop and you keep increasing the loop 1 by 1 until the value in $i is less than 10 or equal 10. Then the value in $i is added to the value in the $total.
1st Iteration $total = total + 1
2nd Iteration $total = total + 2
3rd Iteration $total = total + 3
. . . . .
10th Iteration(because $i <= 10) $total = total + 10
Then exit the loop and now $total = 55
In the python code you have also using while loop and 0 is assigned to the total variable at the beginning of the code.
In this case all you have to do is increase the value of the total variable by 1
That is,
1st Iteration total = total + 1
2nd Iteration total = total + 1
3rd Iteration total = total + 1
. . . . .
10th Iteration(because total <= 10) total = total + 1
Then exit the while loop and now total = 11
These two codes are not the same!!!
Simply because in php code you are incrementing it with i as:total+i
if total wore intially zero 0+1+2+3+4+5+6+7+8+9+10==55
while in python you are incrementing it with total+1 not i
so each time only +1 incrementaion
so 0+1+1+1+1+1+1+1+1+1+1=11
i with1