php - Foreach循环+关联数组

Question

如果我有以下代码：

$employeeAges;
$employeeAges["Lisa"] = "28";
$employeeAges["Jack"] = "16";
$employeeAges["Ryan"] = "35";
$employeeAges["Rachel"] = "46";
$employeeAges["Grace"] = "34";

foreach( $employeeAges as $name => $age){
    echo "Name: $name, Age: $age <br />";
}

如何输出特定信息？下面是一个错误编写的示例：

foreach( $employeeAges as $name => $age ) {
     $selective = $name["Lisa"]->$age;
     $secondary = $name["Grace"]->$age;
     echo "The person you're looking for is $selective years old. And the other one is $secondary years old.";
}

如您所见，我只想获取特定项$ key的$ value。上面的代码输出以下错误：

Trying to get property of non-object 

有人可以帮忙这段代码吗？非常感激。

Answer 1

如果我理解的正确，并且您只想确定某个人的年龄，请执行以下操作：

$selective = $employeeAges["Lisa"];
$secondary = $employeeAges["Grace"];
echo "The person you're looking for is $selective years old. And the other one is $secondary years old.";

->运算符用于访问对象的命名成员。参见： http://www.php.net/manual/en/language.oop5.basic.php

如注释中所述，要遍历数组以查找特定键，请执行以下操作：

foreach ($employeeAges as $name => $age) {
    if ($name == "Grace") {
        echo $name . " is " . $age . " years old";
        break;
    }
}