As the post mentions, I worked on the DAG (an on-prem IdP implementation) for many years, which was based on simpleSAMLphp. So "PHP: a fractal of bad design" was our other north star after the SAML specs for avoiding critical security issues. I spent many hours poring over that blog post trying my best to avoid PHP bugs.
Here was a fun one that occurred due to PHP's wonky in_array behavior: https://simplesamlphp.org/security/201710-01
You'd be shocked at the number of developers that believe C has no types.
Signals their ease to spit out incorrect information with confidence. That has no place in engineering.
You guys are in an awkward position where you are both the old grandpa and the new kid on the block simultaneously while there are competent middle aged workers around.
I use many languages. Some more than PHP. But that's besides the point.
I suppose you are more a fan of the histrionic tone of the criticism than anything? In which case, I'm with you there. It's equal to the most unhinged but technically correct rants of Zed Shaw for me.
It's a classic that everyone should at least know about and have read at least once.