Constants not working in PHP 7.2

[sigma67]

In PHP 7.2 there is now the following exception when trying to use the LE, GE, EQ constants:

ErrorException: Use of undefined constant LE - assumed 'LE' (this will throw an Error in a future version of PHP)

[remoteclient]

I had the same issue today. After I changed all occurrencies to quotated ones like GE to 'GE' I got an exception the php can't find the LPsolve extension. I looked on the system and saw that I symlinked the extension from a folder which got deleted. When I copied the extension in the reight place for my php version it was working again without any modifikations to the code.

So my guess is, that you upgraded the php version and didn't install the LPsolve extension for the new php version. I am on php 7.2 and it works.