Sorting a multidimensional array by value with a condition
Sorting a multidimensional array by value is pretty simple and has already been answered several times
usort($myArray, function($a, $b) {
return $a['field'] - $b['field'];
});
The problem I am facing now is that I need a different condition. Imagine I have an array with 10 cars and 10 motorcycles. These cars and bikes are an array / object with values containing a field speed
. how
$car1 = [
'speed' => 100,
'type' => 'car'
]
$car2 = [
'speed' => 120,
'type' => 'car'
]
$car3 = [
'speed' => 180,
'type' => 'car'
]
$motorcycle1 = [
'speed' => 80,
'type' => 'motorcycle'
]
They are all stored in one array
$vechicles = [$car1, $car2, $car3, $motorcycle1]
Now I want to sort by speed. Which, as I said, is easy
usort($myArray, function($a, $b) {
return $a['speed'] - $b['speed'];
});
The problem I'm facing right now is that regardless of the speed setting, at least every third car MUST be a motorcycle. Maybe the first entries are motorcycles, it doesn't matter, but these are not all cars. There must always be at least one motorcycle. It doesn't matter if it's 1, 2 or 3 bikes. So at the end it should look like this.
$finalArray = [$car3, $car2, $motorcycle1, $car1];
As you can see, while $car1
faster than $motorcycle1
, the bike goes earlier.
The point is that I have two different arrays
$cars = [$car1, $car2, $car3]
and
$motorcycles = [$motorcycle1]
I can just insert it like
array_splice($cars, 2, 0, $motorcycles[0]);
But then I got the problem that I can't sort it by speed. Is there a way to achieve this?
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Ok, the simplest solution
$vehicles = [...]; // sorted by speed already
$count = count($vehicles);
$temp = 0;
foreach($vehicles as $key => $veh){
if(is_car($veh)){
$temp++;
}else{
$temp = 0;
}
if($temp == 3){
for($i = $key + 1; $i<=$count; $i++){
if(is_motorcycle($vehicles[$i])){
array_splice($vehicles, $key, 0, $vehicles[$i]);
break;
}
}
$temp = 0;
}
}
Obviously this is not working code, I just wrote it to illustrate my idea, if you think you can benefit from it, happy setup!: P
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