PHP语法错误求助：unexpected T_CONSTANT_ENCAPSED_STRING报错排查

报错信息：

PHP Parse error: syntax error, unexpected '"."' (T_CONSTANT_ENCAPSED_STRING), expecting ';' in /home/yKJgGf/prog.php on line 89

错误原因 #

第89行的__toString方法中，return语句的字符串拼接缺少了连接运算符.。原代码里$this->name与后面的"."之间没有用.连接，PHP无法解析这种语法。

修复后的代码 #

class Animal{
    public $name;
    public $color;
    public function __construct($name,$color){
        $this->name = $name;
        $this->color = $color;
    }
    public function intro(){
        echo "<br> The animal is {$this->name} and the color is {$this->color}.";
    }
    public function __toString() { //89th line
        return "Name of the object is " . $this->name . ".";
    }
}

内容的提问来源于stack exchange，提问作者Gizemitto