<?php
class a
{
    public function a(){echo a;}
    /*b*/
    public function b()
    {echo b;}
    //c
    public function c(){
       echo c;
    }
}
?>

class a
{
    public function a(){echo a;    }
    /*b*/
    public function b(){
        echo b;
    }
    //c
    public function c(){
       echo c;
    }
}

$class = new ReflectionClass('a');
$method=$class->getMethod('b');
$filename=$method->getFileName();//获取文件名
$start=$method->getStartLine();//获取方法起始行
$length=$method->getEndLine()-$start;//获取方法体长度

$source=file($filename);
$code = implode('',array_slice($source,$start-1,$length+1));
echo $code;

/*     public function b(){
        echo b;
    } */