Bug #71420 [Nab]: Can't echo very large strings

Edit report at https://bugs.php.net/bug.php?id=71420&edit=1 ID: 71420 User updated by: mark at interactivedimension dot com Reported by: mark at interactivedimension dot com Summary: Can't echo very large strings Status: Not a bug Type: Bug Package: Performance problem Operating System: Linux PHP Version: 5.6.17 Block user comment: N Private report: N New Comment: I'm not sure. I can do pretty much anything with the string except echo it. I can write it to a file for instance, but I can't use readfile() and output it on screen, it's really weird. Although I can do all this on my local machine with no errors. I've read elsewhere that it may have something to do with Nagles Algorithm and tcp/ip buffering, but that's a bit over my head. I've been through all the settings on the server that I can think of but nothing is fixing it. Previous Comments: ------------------------------------------------------------------------ [2016-01-20 23:00:19] rasmus@php.net This doesn't seem like a PHP problem then. PHP has no idea, and doesn't in any way care what kind of client is used for the request. If one works and another doesn't, the problem is elsewhere. ------------------------------------------------------------------------ [2016-01-20 21:36:32] mark at interactivedimension dot com 2 million. And the page hangs, never completes. Bizarrely if I view the same page, using the same wifi connection on a mobile it loads in under a second. ------------------------------------------------------------------------ [2016-01-20 18:34:46] requinix@php.net To be clear: you're saying the page *hangs*, meaning it never completes? Or it completes but leaves an empty page? And is that number near 2 million or 2 *billion*? What about <?php error_reporting(-1); ini_set('display_errors', true); echo "start<br>\n"; flush(); $data = ''; for($i = 0; $i < 3000000; $i++) { $data .= 1; } echo "end<br>\n"; flush(); echo $data; flush(); ?> ------------------------------------------------------------------------ [2016-01-20 16:10:43] mark at interactivedimension dot com Nothing at all. I don't get any errors on screen either. ------------------------------------------------------------------------ [2016-01-20 15:33:35] rasmus@php.net Anything in your error log? You could be hitting a configured memory limit. ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at https://bugs.php.net/bug.php?id=71420 -- Edit this bug report at https://bugs.php.net/bug.php?id=71420&edit=1