Question

在选择器选项中选择两个行星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"; 
}

您从Nova Terra到Nova Iaponia或从Nova Iaponia到Nova Terra＆＃34;阅读。 To =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

您只需要交换逻辑运算符即可获得所需的结果

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"; 
}

我可以使用两个||和一个＆amp;＆amp;在PHP中的同一个if语句中？

1 个答案: