php在迭代循环时回显结果

问题描述：

I am execution loop and inside loop there is data processing function inside loop.

  for($i = 0 ; $i <=680 ; $i = $i + 40)
    {
          $url = 'http://www.yelp.com/biz/franchino-san-francisco?start=80';
          $root = yelp($url);
          var_dump($root);
    }

This loop takes long time to execute, and results are echoed at the end when entire loop completes.

How can I echo the result during each iteration?

Actually what happens here? does to result are stored in buffer and at the end echoed or what?

我是执行循环和内部循环，循环内部有数据处理函数。 p> for（$ i = 0; $ i＆lt; = 680; $ i = $ i + 40） { $ url ='http：//www.yelp.com/biz/franchino- san-francisco？start = 80'; $ root = yelp（$ url）; var_dump（$ root）; } code> pre>

此循环需要很长时间才能执行，并且在整个循环完成时结果会在结束时回显。 p>


如何在每次迭代过程中回显结果？ p> 
 
 
实际上这里会发生什么？ 结果是存储在缓冲区中，最后是回显还是什么？ p> 
  div>

答

PHP buffers the output.

If you want to output stuff to the browser immediately you can use the flush() and ob_flush() functions:

for ($i = 0; $i <= 680; $i += 40) {
    $url = 'http://www.yelp.com/biz/franchino-san-francisco?start=80';
    $root = yelp($url);
    var_dump($root);
    flush();
    ob_flush();
}

答

If you are executing PHP through a web-page, this would be the behaviour.

PHP is a server side language and all code will be executed before displaying the output to the client. (using a browser)

If you want to display the result within the loop, better use console / cmd (command line)

Here is something that will help you use PHP with commandline.

php在迭代循环时回显结果

相关推荐