如何将三元运算符与echo/what'；我的错了 - How do you use the ternary operator in conjunction with echo/what's wrong with mine?

How do you use the ternary operator in conjunction with echo/what's wrong with mine?

我有以下PHP语句：

echo "<p><strong>Ratio:</strong> " . ($row2["losses"] == 0) ? "&infin;</p>" : number_format(($row1["wins"] / $row2["losses"]), 2) . "</p>";

我做错了什么？它每次都会出错。

echo "<p><strong>Ratio:</strong> " .( ($row2["losses"] == 0) ? "&infin;</p>" : number_format(($row1["wins"] / $row2["losses"]), 2) ). "</p>";

你需要把你的三元数放在（和）之间。

其他示例（可读性更好）：

echo "hi i am ".( $user == "john"? "John" : "Bla")." Doe";

您的语句被解释为

echo ( "<p><strong>Ratio:</strong> " . ($row2["losses"] == 0) ) ? 
       "&infin;</p>" : 
       number_format(($row1["wins"] / $row2["losses"]), 2) . "</p>";

这是因为.比?具有更高的先验性http://php.net/manual/en/language.operators.precedence.php

您需要告诉解析器三进制的起始和终止位置，或者更好的是，将其拆分为更多的语句，这样就不会出现混乱。

echo "<p><strong>Ratio:</strong> ";
echo $row2["losses"] == 0 ? "&infin;" : number_format(($row1["wins"] /$row2["losses"]), 2);
echo "</p>";