Support PHP 7.3

[bobbingwide]

A number of changes are required to oik-bwtrace to support PHP 7.3

1. Need to update table of end-of-life.
2. Fix for a problem associated with ob_end_flush()

Notice: Undefined index: 7.3 in 
C:\apache\htdocs\wordpress\wp-content\plugins\oik-bwtrace\admin\class-oik-trace-info.php 
on line 228

Notice: ob_end_flush(): failed to send buffer of zlib output compression (0)
 in /home/oikcouk/public_html/wp-includes/functions.php on line 4212
ob_get_flush(): failed to send buffer of zlib output compression (0) 
in /home/oikcouk/public_html/wp-content/plugins/oik-bwtrace/includes/oik-actions.php on line 30

Current version of PHP on oik-plugins.co.uk 7.3.8

[bobbingwide]

I'll need to install PHP 7.3 locally

[bobbingwide]

Note: My hosting with TSOhost was updated to PHP 7.3 automatically. The messages have started to appear on a number of sites. There is a workaround.

Workaround

• Open cPanel for the domain
• Use the MultiPHP INI Editor and edit the settings for the domain's document root
• Change the value for zlib.output_compression to Off

zlib.output_compression | Whether to transparently compress pages. If this option is set to "On" in php.ini or the Apache configuration, pages are compressed if the browser sends an "Accept-Encoding: gzip" or "deflate" header.

[bobbingwide]

There's a core TRAC that's been opened for the first ob_end_flush message. https://core.trac.wordpress.org/ticket/22430

A simple fix to prevent the first message is to add a couple of lines at the start of wp_ob_end_flush_all, returning without calling ob_end_flush if zlib output_compression is enabled.

function wp_ob_end_flush_all() {
	if ( ini_get( 'zlib.output_compression') ) {
	    return;
    }

[bobbingwide]

The far-future-expiry-header plugin also produces messages.

Warning: ob_start(): output handler 'ob_gzhandler' conflicts with 'zlib output compression' in C:\apache\htdocs\hm\wp-content\plugins\far-future-expiry-header\far-future-expiration.php on line 73

Notice: ob_start(): failed to create buffer in C:\apache\htdocs\hm\wp-content\plugins\far-future-expiry-header\far-future-expiration.php on line 73