Why does my php while loop block output

Question

I have php code like this:

<?php

While (1)echo "hello";

The server is outputing a chunk of data instead of progressively outputting each 'hello'

Google "php server push" to learn how to do real-time output from PHP. — Barmar
– Barmar, Commented Jul 11, 2016 at 22:19

Barmar · Accepted Answer · 2016-07-11 22:03:44Z

4

By default, PHP output is not sent to the browser while the script executes. Nothing gets sent to the browser until the script finishes. Since your loop never ends, the script never exits, so nothing shows in the browser.

answered Jul 11, 2016 at 22:03

Barmar

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3 Comments

Ismail RBOUH Over a year ago

He can use ob_flush to send the buffer content to the browser immediately.

user557846 Over a year ago

@IsmailRBOUH that's a bit of a hit-or-miss approach it wont always work

P. Avery Over a year ago

Unfortunately it doesn't always work it waits until the buffer is full and sends all the data at one time

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