异常处理在OOP PHP不工作(Exception handling in oop PHP not

我是很新的面向对象的PHP和尝试一些基本的例子来获得良好的手放在了PHP。我已经在上面我正努力学习异常处理，当年龄大于20，但无法正常工作产生异常错误信息简单〔实施例。

<?php
interface read_methods 
{
    public function read_age($age);
}
abstract class  person 
{ 
    var $gender;
    var $animal;
    var $birds;
    abstract function group($group);
    function people($value)
    {
        $this->gender=$value;
    }
    function animals($value)
    {
        $this->animal=$value;
    }
    function bird($value)
    {
        $this->birds=$value;
    }
}

class behaviour extends person implements read_methods
{
    var $nonhuman;
    function get_all()
    {
        return $this->people();
        return $this->animals();
        return $this->bird();
    }
    function non_human($nonhuman)
    {
        return $this->alien=$nonhuman;
    }
    function read_age($age)
    {       
        try {
            $this->age=$age;
        }
        catch(Exception $e)
        {
            if ($age > 20)
            {
                throw new Exeption("age exceeds",$age, $e->getMessage());
            }
        }               
    }
    function group($group)
    {
        return $this->group=$group;
    }
}

$doerte=new behaviour();  
$doerte ->people(array('male','female'));
$doerte ->animals(array('fish','whale'));
$doerte ->bird(array('parrot','crow'));
$doerte->non_human('alien');
$doerte->read_age('23');
$doerte->group('living_things');
//$doerte->__autoload();
print_r($doerte);
?>

Answer 1:

你扔在错误的地方除外。

如果事情是无效的，你需要抛出。属于尝试的一部分。美中不足的部分是用来处理异常。

认为这样的说法：如果你有PROGRAMM叫喊呼救，因为它不知道如何处理数据（TRY）你特罗异常。异常块应该被用来采取呼救的护理

function read_age($age)
{       
    try {
        if($age > 20) {
            throw new Exception('Too old!');
        }
        $this->age=$age;
    }
    catch(Exception $e)
    {
        echo 'There has been an error: '.$e->getMessage();
    }               
}

Answer 2:

你想，当年龄超过20创造一个例外？这里可以是溶液（部分代码）：

/* ... */
function read_age($age)
    {       
        if ($age > 20) {
            throw new Exception("age exceeds, shoulw be less than 20");
        } else {
            $this->age=$age;
        }
    }
/* ... */

try {
    $doerte=new behaviour();  
    $doerte ->people(array('male','female'));
    $doerte ->animals(array('fish','whale'));
    $doerte ->bird(array('parrot','crow'));
    $doerte->non_human('alien');
    $doerte->read_age('23');
    $doerte->group('living_things');
    echo "It's all right";
    print_r($doerte);
} catch (Exception $e) {
    echo "Something went wrong: ".$e->getMessage();
}