Php: How can this php script takes too long to respond? - php

Question

I keep seeing Waiting for Cache and it takes at least 30 minutes to get
the response.
Is there a better way?
Here's the link:
http://tapnapp.co/planning/phpScripts/getFullViewTasks.php?counter=1&sDateHour=1525154400&eDateHour=1527793200
And here is the code:
<?php
if (isset($_GET['counter'])) {
require_once '../functions.php';
$sDateHour = $_GET['sDateHour'];
$eDateHour = $_GET['eDateHour'];
$now = time() - 24*60*60;
$fn = new Func;
$fn->select('id_profile, groupe','profile',''," date_f_contract>='$now' AND groupe>0");
$sel = new Func;
$getHrName = new Func;
while ($row = mysqli_fetch_assoc($fn->select)) {
$pr_id = $row['id_profile'];
$sel->select('*','counter',''," from_interval>='$sDateHour' AND to_interval<='$eDateHour' AND id_profile='$pr_id'");
$nr= mysqli_num_rows($sel->select);
if ($nr > 0) {
//here we have to do the total counter
$totalCounter = 0;
$from_interval = 0;
$to_interval = 0;
$name = "";
$tmp_id_profile = 0;
$tmp_f_int = 0;
$tmp_to_int = 0;
while ($r = mysqli_fetch_assoc($sel->select)) {
$frint = $r['from_interval'];
$toint = $r['to_interval'];
//$counter_ct = $r['counter'];
$totalCounter += $counter_ct;
$getHrName->select('libelle AS lbl, COUNT(libelle) AS totalHr',"horraire",""," date_heure_deb>='$frint' AND date_heure_fin<='$toint' AND id_profile='$pr_id' GROUP BY libelle ORDER BY totalHr DESC LIMIT 1");
$rr = mysqli_fetch_assoc($getHrName->select);
$r['hrname'] = $rr['lbl'];
$name = $rr['lbl'];
$r['counter'] = $rr['totalHr'];
/*
$from_interval=$frint;
$to_interval = $toint;
*/
$row['tasks'][] = $r;
}
/*
$r['counter']=$totalCounter;
$r['from_interval']=$from_interval;
$r['to_interval']=$to_interval;
$r['hrname']=$name;*/
//$row['tasks'][]=$r;
} else {
/*
id_counter: "1",
id_profile: "17",
from_interval: "1519887600",
to_interval: "1519934400",
counter: "18"}
*/
/*
$fake['id_counter']=0;
$fake['id_profile']=$pr_id;
$fake['from_interval']=$sDateHour;
$fake['to_interval']=$eDateHour;
$fake['counter']=0;
$row['tasks'][]=$fake;
*/
}
$res[] = $row;
}
$temp['data'] = $res;
$fn->deconnect();
$sel->deconnect();
echo json_encode($temp, JSON_PRETTY_PRINT);
}
?>
So what is wrong with this if anyone can understand?
Is that because of mysql or because of the php?