我可以用两个吗 ||和 PHP 中同一个 if 语句中的一个 &&？

Question

您在选择器选项中选择了两个行星 A 和 B 来测量距离。

例如：

if (($planetA == "Nova Terra" || $planetB == "Nova Iaponia") && ($planetA == "Nova Iaponia" || $planetB == "Nova Terra")) 
{ 
    echo "From $planetA to $planet B: 290 parsecs"; 
}

else if (($planetA == "Nova Terra" || $planetB == "Novo Mars") && ($planetA == "Novo Mars" || $planetB == "Nova Terra"))
{ 
    echo "From $planetA to $planet B: 230 parsecs"; 
}

您阅读了"from Nova Terra to Nova Iaponia OR from Nova Iaponia to Nova Terra"。到=和。

这类似于：

if ($planetA == "Nova Terra" || $planetB == "Nova Iaponia") 
{ 
    echo "From $planetA to $planet B: 290 parsecs"; 
}

else if ($planetA == "Nova Iaponia" || $planetB == "Nova Terra") 
{ 
    echo "From $planetA to $planet B: 290 parsecs"; 
}

else if ($planetA == "Nova Terra" || $planetB == "Novo Mars")
{ 
    echo "From $planetA to $planet B: 230 parsecs"; 
}

else if ($planetA == "Novo Mars" || $planetB == "Nova Terra")
{ 
    echo "From $planetA to $planet B: 230 parsecs"; 
}

Answer 1

你只需要交换你的逻辑运算符就可以得到你想要的结果

if (($planetA == "Nova Terra" && $planetB == "Nova Iaponia") || ($planetA == "Nova Iaponia" && $planetB == "Nova Terra")) 
{ 
    echo "From $planetA to $planet B: 290 parsecs"; 
}

else if (($planetA == "Nova Terra" && $planetB == "Novo Mars") || ($planetA == "Novo Mars" && $planetB == "Nova Terra"))
{ 
    echo "From $planetA to $planet B: 230 parsecs"; 
}

我可以用两个吗 ||和 PHP 中同一个 if 语句中的一个 &&？

Can I use two || and one && in the same if statement in PHP?

php

if-statement

logical-operators