Existe-t-il un moyen d'optimiser ce morceau de code pour qu'il fonctionne plus rapidement? J'apprécierais toutes les suggestions!Optimisation des boucles de code en PHP
Ce morceau de code traite le transfert d'arêtes pendant la création du graphe.
foreach($times_arrival as $city_id => $time_points) {
// if city is not prohibited for transfers and there is and exists any departure times for this city
if (isset($times_departure[$city_id]) && isset($cities[$city_id]))
{
foreach($times_arrival[$city_id] as $t1_info)
{
foreach($times_departure[$city_id] as $t2_info)
{
if ($t1_info[0] != $t2_info[0]) //transfers are allowed only for different passages
{
$t1 = $t1_info[1];
$t2 = $t2_info[1];
$vertex_key = new Vertex($city_id, $t1, 1);
$vertex_key = $vertex_key->toString();
//minimum transfer time is 10 min.
if (date('H:i', strtotime($t2)) > date('H:i', strtotime('+ 10 minutes', strtotime($t1))))
{
$this->graph[$vertex_key][] = new Edge(
NULL,
$vertex_key,
new Vertex($city_id, $t2, 0),
(float) 0,
$f((strtotime($t2) - strtotime($t1))/60, 0, 1) //edge weight
);
}
//if transfer is on the bound of the twenty-four hours
else if (date('H:i', strtotime('+ 24 hours', strtotime($t2))) > date('H:i', strtotime('+ 10 minutes', strtotime($t1))))
{
$this->graph[$vertex_key][] = new Edge(
NULL,
$vertex_key,
new Vertex($city_id, $t2, 0),
(float) 0,
$f(strtotime('+ 24 hours', strtotime($t2)) - strtotime($t1)/60, 0, 1) //edge weight
);
}
}
}
}
}
}
exemple de variables:
var_dump($times_arrival); //$times_departure have the same structure
array
3 =>
array
0 =>
array
0 => string '1' (length=1)
1 => string '08:12' (length=5)
1 =>
array
0 => string '2' (length=1)
1 => string '08:40' (length=5)
41 =>
array
0 =>
array
0 => string '21' (length=2)
1 => string '12:40' (length=5)
Wow! 'foreach (foreach (foreach ($ foo => $ bar)))' –
Publiez des données '$ times_arrival', s'il vous plaît. –
@GabrielSantos mis à jour. – Yekver