Home Backend Development PHP Tutorial PHP有没有间隔几秒再执行的功能?该怎么处理

PHP有没有间隔几秒再执行的功能?该怎么处理

Jun 13, 2016 am 10:15 AM
echo php quot sleep

PHP有没有间隔几秒再执行的功能?
比如有段代码,先执行第一行,然后间隔5秒后,再执行第二行

注意,不是循环,是按照从上到下的顺序执行代码,中间需要停顿几秒钟

------解决方案--------------------
sleep(5);
------解决方案--------------------
sleep(5) 程序停顿5秒
------解决方案--------------------
前面的1被存在服务器的输出缓存区了,或者是你的浏览器z设置问题。但无论如何,你是等了至少5秒后才看到有输出的!

PHP code
echo microtime(); // 当前时间戳sleep(5);echo "<br>";echo microtime();<br><font color="#e78608">------解决方案--------------------</font><br>浏览器方面的原因,用CLI方式调试 你就能明显的看到停顿的效果了<br>如果只是为了这个停顿的显示效果,不如交给来前端js来处理,如果程序是放在后台运行,你要相信:两行的中间一定停顿了5秒<br><font color="#e78608">------解决方案--------------------</font><br>
Copy after login
探讨

好像还是有点问题

PHP code
echo '1';
sleep(5);
echo '
5';


每次刷新貌似都是1和5同时显示出来

------解决方案--------------------
每隔5秒钟执行一次,总计需要多少次呢?
如果是无限循环的话,最后用SHELL或者CRON来控制执行PHP。一般PHP脚本执行时间最好不要超过60秒。否则占资源不说,脚本可能会卡死。
------解决方案--------------------
sleep(5)
------解决方案--------------------
echo microtime(); // 当前时间戳
flush();
sleep(5);
echo "
";
echo microtime();

这样你在浏览器就会看到效果了
------解决方案--------------------
毫无意义的工作,不说楼上所有的代码是用问题的,即便是完全没有问题的代码,也只在特定的文本服务器配合特定的浏览器是残能实现

所有人(包括傻瓜)都认为,现在的互联网太慢。居然还有人有意的减缓网络的响应速度

------解决方案--------------------
PHP主要是用来生成网页的,网页总是一次生成然后传送到浏览器,不可能一点一点传送过来,要不然一次一个字节,会有多少个页面传过来?只有把PHP设置为CMD命令行方式和CGI方式可以实现象桌面程序那样的任意停顿和间断显示内容
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