How to load a php page with a 24 hours script running? - php

Question

Here is the case first and then if necessary I'll post code:
The script
I have a PHP script with a for loop, that for loop will take 24
hours to be completed.
The problem
The page doesn't load because it waits until the for loop is
completed.
What I try to do
To show the page while the for loop is running
PD: Please don't suggest Google nor PHP Manual, both tried, nothing found.
Here some code:
for ($s = $getEnergy; $s < $maxEnergy; $s += $getEnergy + $sumEnergy2){
$prodToEnergySql = "UPDATE ".$planetSolar." SET energy = ".$s."";
$prodToEnergyResult = mysqli_query($db,$prodToEnergySql);
$solarSQL3 = "SELECT energy FROM ".$planetSolar."";
$solarResult3 = mysqli_query($db,$solarSQL3);
$solarRows3 = mysqli_fetch_array($solarResult3);
$solarEnergy = $solarRows3['energy'];
}
Note that $getEnergy is 0 and $maxEnergy 1.200, increment 0,14.
Alternative Code
while ($getEnergy < $maxEnergy ){
$prodToEnergySql = "UPDATE ".$planetSolar." SET energy = energy + ".$sumEnergy2."";
$prodToEnergyResult = mysqli_query($db,$prodToEnergySql);
$solarSQL3 = "SELECT energy FROM ".$planetSolar."";
$solarResult3 = mysqli_query($db,$solarSQL3);
$solarRows3 = mysqli_fetch_array($solarResult3);
$solarEnergy = $solarRows3['energy'];
}
Note: there are at least 8 variables needed to execute the script.