[PHP]链式调用

<?php
class aClass{
    public function a(){
        echo "Yes";
        return $this;
    }

    public function b(){
        echo ",";
        return $this;
    }

    public function c(){
        echo "I agree with the word.";
    }
}

$a = new aClass();

//调用方法
echo $a->a()->b()->c();
?>

关键：每个方法后面的return $this;

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