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Hello!

You forgot the Float:-Tag.

PHP Code:

stock PlacaVeiculoPerto(playerid)
{
    new Float:distance = 10.0, Float: currentDistance = 11.0, vehicleid = 0, Float:Pos[3];
    for(new i; i < MAX_VEHICLES; i++)
    {
        GetVehiclePos(i, Pos[0], Pos[1], Pos[2]);
        currentDistance = GetPlayerDistanceFromPoint(playerid, Pos[0], Pos[1], Pos[2]);
        if(currentDistance <= 7.0 && currentDistance < distance) {
            vehicleid = i;
            distance = currentDistance;
        }
    }
    return vehicleid;
} 


- Mencent