Triple P : 类-1.1

本文介绍了一个简单的PHP类,用于表示二维平面上的点,并实现了计算两点间距离的功能。通过该类,用户可以轻松创建点对象并进行距离计算。

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script1.1.php  二维平面

<?php
class Point { //类定义
	public $x;//
	public $y;

	function _construct($x,$y){ //构造方法
		$this->x=$x;
		$this->y=$y;
	}
	function get_x(){
		return($this->x);
	}
	function get_y(){
		return($this->y);
	}
	function dist($p){ //计算平面两点距离
		return(sqrt( pow($this->x-$p->get_x(),2)+
			          pow($this->y-$p->get_y(),2)));
	}
}//类定义结束
	$p1=new Point(2,3);
	$p2=new Point(3,4);
	echo $p1->dist($p2),"\n";
	$p2->x=5;
	echo $p1->dist($p2),"\n";
?>

关键字:public,声明为public的成员,允许全局访问成员变量的数据。使用public成员,成员变量的值是不可控制的。可以为每个成员直接编写get和set函数。

但是PHP提供了“魔术方法”,用来取代必须为每个成员写两个函数的方法。故使用private和protected关键字更好的保护类的成员变量。public是默认的可见性,

如果没有指定成员或方法的可见性,默认的属性就是public。



22:02:03:343 INFO 17028 --- [erverWorker-5-2] o.a.d.r.t.netty4.NettyChannelHandler : [DUBBO] The connection [id: 0xec5dea40, L:/10.44.85.106:50053 - R:/10.44.85.106:10457] of 10.44.85.106:10457 -> 10.44.85.106:50053 is established., dubbo version: 3.3.0, current host: 10.44.85.106 22:02:03:417 DEBUG 17028 --- [erverWorker-5-2] .a.d.r.p.t.r.m.RestRequestHandlerMapping : [DUBBO] Received http request: ServletHttpRequestAdapter{method='POST', uri='/carts', contentType='application/json;charset=UTF-8'}, dubbo version: 3.3.0, current host: 10.44.85.106 22:02:03:417 DEBUG 17028 --- [erverWorker-5-2] .a.d.r.p.t.r.m.RestRequestHandlerMapping : [DUBBO] No handler found for http request: ServletHttpRequestAdapter{method='POST', uri='/carts', contentType='application/json;charset=UTF-8'}, dubbo version: 3.3.0, current host: 10.44.85.106 22:02:03:419 INFO 17028 --- [erverWorker-5-2] .r.p.t.h.AbstractServerTransportListener : [DUBBO] An error occurred while processing the http request with DefaultHttp11ServerTransportListener, Http1Request{method='POST', path='/carts', contentType='application/json;charset=UTF-8'}, dubbo version: 3.3.0, current host: 10.44.85.106 org.apache.dubbo.remoting.http12.exception.HttpStatusException: Invoker not found at org.apache.dubbo.rpc.protocol.tri.h12.AbstractServerTransportListener.doRoute(AbstractServerTransportListener.java:127) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.tri.h12.AbstractServerTransportListener.onBeforeMetadata(AbstractServerTransportListener.java:121) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.tri.h12.AbstractServerTransportListener.onMetadata(AbstractServerTransportListener.java:88) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.tri.h12.AbstractServerTransportListener.onMetadata(AbstractServerTransportListener.java:53) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.remoting.http12.netty4.h1.NettyHttp1ConnectionHandler.channelRead0(NettyHttp1ConnectionHandler.java:56) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.remoting.http12.netty4.h1.NettyHttp1ConnectionHandler.channelRead0(NettyHttp1ConnectionHandler.java:29) ~[dubbo-3.3.0.jar:3.3.0] at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:99) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:93) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at org.apache.dubbo.remoting.http12.netty4.h1.NettyHttp1Codec.channelRead(NettyHttp1Codec.java:49) ~[dubbo-3.3.0.jar:3.3.0] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103) ~[netty-codec-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103) ~[netty-codec-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:436) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:346) ~[netty-codec-4.1.112.Final.jar:4.1.112.Final] at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:318) ~[netty-codec-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:251) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.handler.codec.ByteToMessageDecoder.handlerRemoved(ByteToMessageDecoder.java:266) ~[netty-codec-4.1.112.Final.jar:4.1.112.Final] at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:537) ~[netty-codec-4.1.112.Final.jar:4.1.112.Final] at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:469) ~[netty-codec-4.1.112.Final.jar:4.1.112.Final] at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:290) ~[netty-codec-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1407) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:440) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:918) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:788) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:724) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:650) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562) ~[netty-transport-4.1.112.Final.jar:4.1.112.Final] at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:994) ~[netty-common-4.1.112.Final.jar:4.1.112.Final] at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.112.Final.jar:4.1.112.Final] at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.112.Final.jar:4.1.112.Final] at java.base/java.lang.Thread.run(Thread.java:829) ~[na:na] 22:02:03:445 DEBUG 17028 --- [erverWorker-5-2] .d.r.h.AbstractServerHttpChannelObserver : [DUBBO] Http response body sent: '{"message":"Invoker not found","status":"404"}' by [org.apache.dubbo.remoting.http12.netty4.h1.NettyHttp1Channel@9b93704], dubbo version: 3.3.0, current host: 10.44.85.106 22:02:03:449 DEBUG 17028 --- [erverWorker-5-2] .d.r.h.AbstractServerHttpChannelObserver : [DUBBO] Http response headers sent: NettyHttp1HttpHeaders{headers=DefaultHttpHeaders[content-type: application/json, alt-svc: h2=":50053", content-length: 46]}, dubbo version: 3.3.0, current host: 10.44.85.106
07-19
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