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<?php
    class Car{
    public $color;
    public $model;
    public function __construct($color, $model){
        $this -> color = $color;
        $this -> model = $model;
    }
    public function message(){
        return "My car is a".$this -> color."".$this -> model."!";#注意要加分号！
    }
}

#上面完成了对类的定义！
$myCar = new Car("black", "Volvo");#实例化类，对其对象赋值；
echo $myCar -> message();#调用myCar类中的对象message()
echo "<br>";
$myCar = new Car("red", "Toyota");
echo $myCar -> message();
?>

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<?php
    echo strlen("Hello,world");
?>
	
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<?php
echo str_word_count("hello world");
?>php

​ 

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<?php
echo strrev("hello world");
?>

strrev()用来反转字符。

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<?php
echo strpos("hello world", "world");#意思是在后面的字符中找前面的字符，并将匹配部分输出
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<?php
echo str_replace("hello", "Dolly", "hello world");
?>