Detailed explanation of __toString() method in PHP

__toString(), the response method when the class is treated as a string

Function:

__toString() method is used for a class How to respond when it is treated as a string. For example what `echo $obj;` should display.

Note:

This method must return a string, otherwise a fatal error of level `E_RECOVERABLE_ERROR` will be issued.

Warning:

Cannot throw exceptions in the __toString() method. Doing so will result in a fatal error.

Code:

name = $name;
        $this->age  = $age;
        $this->sex  = $sex;
    }
    public function __toString()
    {
        return  'go go go';
    }
}
$person = new Person('小明'); // 初始赋值
echo $person;

Result:

go go go

So what happens if there is no __toString() magic method in the class? Let’s test it:

Code:

name = $name;
        $this->age  = $age;
        $this->sex  = $sex;
    }
    
}
$person = new Person('小明'); // 初始赋值
echo $person;

Result:

Catchable fatal error: Object of class Person could not be converted to string in D:\phpStudy\WWW\test\index.php on line 18
很明显，页面报了一个致命错误，这是语法所不允许的。

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