Question

我倾向于PHP5类，实例我是新的。但是我试图在foreach内使用Class Methods循环来获取此人的性别，但它只显示第一个人的权利，但没有为第二个人显示第3个等等。

这是我的代码：

class Person{
    // atteributes or property of class
    var $first_name;
    var $last_name;
    var $legs = 2;
    var $hand = 2;
    var $gender;
    function say_hello(){
        echo "Hello inside the class from " . get_class($this) . "<br />";
    }
    // full name function
    function full_name(){
        echo $this->first_name ." ". $this->last_name;
    }
    // Gender
    function gender(){
        $names = array("Hamza","Ali","Ibrar","Muqeet","Hassan","Umer","Shaveer");
        foreach($names as $name){
            if($this->first_name == $name){
                echo $this->gender = "Male";
                break;
            }else{
                echo $this->gender = "Female";
                break;
            }
        }
    }
}

$person = new Person();
$person->first_name = "Hamza";
$person->last_name = "Nisar";
$person->full_name();
echo "<br />";
$person->gender();
echo "<br />";
/*---------------------*/
$person2 = new Person();
$person2->first_name = "Ibrar";
$person2->last_name = "Ahmed";
$person2->full_name();
echo "<br />";
$person2->gender();
echo "<br />";

这就是结果：

Hamza Nisar
Male
Ibrar Ahmed
Female

它必须显示男性也是第二个人

Answer 1

使用foreach循环并检查每种可能性似乎是实现此目的的一种奇怪方式。我建议使用in_array函数替换foreach函数，该函数在if语句中使用时允许您使用较少的代码执行相同的操作。

示例：

<?php class Person{ // atteributes or property of class var $first_name; var $last_name; var $legs = 2; var $hand = 2; var $gender; function say_hello(){ echo "Hello inside the class from " . get_class($this) . " "; } // full name function function full_name(){ echo $this->first_name ." ". $this->last_name; } // Gender function gender(){ $names = array("Hamza","Ali","Ibrar","Muqeet","Hassan","Umer","Shaveer"); if(in_array($this->first_name, $names)){ echo $this->gender = "Male"; } else { echo $this->gender = "Female"; } } } $person = new Person(); $person->first_name = "Hamza"; $person->last_name = "Nisar"; $person->full_name(); echo " "; $person->gender(); echo " "; /*---------------------*/ $person2 = new Person(); $person2->first_name = "Ibrar"; $person2->last_name = "Ahmed"; $person2->full_name(); echo " "; $person2->gender(); echo " "; ?>

Answer 2

<?php

class Person{
    // atteributes or property of class
    var $first_name;
    var $last_name;
    var $legs = 2;
    var $hand = 2;
    var $gender;
    function say_hello(){
        echo "Hello inside the class from " . get_class($this) . "<br />";
    }
    // full name function
    function full_name(){
        echo $this->first_name ." ". $this->last_name;
    }
    // Gender
    function gender($newname){
        $names = array("Hamza","Ali","Ibrar","Muqeet","Hassan","Umer","Shaveer");
        if(in_array($this->first_name, $names)){
            echo $this->gender = "Male";            
        }else{
            echo $this->gender = "Female";          
        }
    }
}

$person = new Person();
$person->first_name = "Hamza";
$person->last_name = "Nisar";
$person->full_name();
echo "<br />";
$person->gender($person->first_name);
echo "<br />";
/*---------------------*/
$person2 = new Person();
$person2->first_name = "Ibrar";
$person2->last_name = "Ahmed";
$person2->full_name();
echo "<br />";
$person2->gender($person2->first_name);
echo "<br />";
?>

Answer 3

这些答案都没有告诉您为什么您的代码无效。当first_name =“Ibrar”：

时，让我们遵循foreach的逻辑

$names = array("Hamza","Ali","Ibrar","Muqeet","Hassan","Umer","Shaveer");
foreach($names as $name){
    if($this->first_name == $name){
        echo $this->gender = "Male";
        break;
    }else{
        echo $this->gender = "Female";
        break;
    }
}

Loop1：IF语句为false，如“Ibrar”！==“Hamza”。因此，使用ELSE，打印女性和休息。

其他答案都是很好的修复。但是，假设您仍然希望使用 foreach 循环。你可以这样做：

$this->gender = 'Female';
$names = array("Hamza","Ali","Ibrar","Muqeet","Hassan","Umer","Shaveer");
foreach($names as $name){
    if ($this->first_name === $name) {
        $this-gender = 'Male';
        break;
    }
}

echo $this->gender;

Answer 4

您需要关注的是中断关键字。如果要获得预期结果，则需要跟踪代码流。根据你的代码，这就是它的内容：

我将从你做错的代码部分开始：

对于$person个对象， $person->gender()将按以下方式执行：

迭代1：

foreach($names as $name)结果$name = "Hamza"

$this->first_name是"Hamza"，== $name

如果条件为真，则打印“男性”。

break;突破了foreach循环。

没有其他迭代。

输出结果为：

Male

对于$person2个对象， $person2->gender()将按以下方式执行：

迭代1：

foreach($names as $name)结果$name = "Hamza"

$this->first_name是"Ibrar"，!= $name

如果条件在这里不为真，即它是假的，那么打印“女性”。

break;突破了foreach循环。

没有其他迭代。

输出结果为：

Female

您的代码没有说出您想要的内容。

它说：

如果数组的第一项具有我们想要的名称，请打印“Male”，否则打印“Female”。只有在检查数组中的第一项后，我们才完成并退出foreach循环。我们不需要检查同一个数组中的其他项目。

所以这就是结果：

对于类Person的每个对象，您创建的$first_name属性值不为"Hamza"，"Female"将从对成员函数{{}的调用中打印出来1}}。

解决方案是编写代码：

如果条件为gender()，则不应突破循环，因为必须使用false数组中的每个项目检查$this->first_name。如果$names数组中的所有项都返回$names，则false属性值为“女性”也会打印出来。

解决方案代码： 在其他答案中已经提到过。

Answer 5

没有foreach requred change和性别功能如下所示，并在函数调用之前写入echo。

function gender(){
    $names = array("Hamza","Ali","Ibrar","Muqeet","Hassan","Umer","Shaveer");
    if(in_array($this->first_name,$names)){
        return $this->gender = "Male";
    }else{
        return $this->gender = "Female";
    }
}

Foreach不在Class Method中工作

5 个答案: