Main problem with PHP is that it was not so good in the past (before PHP 7 and PHP 5). It was slow and it had some weird functionalities. But with release of PHP 7 (and PHP 8), PSR standards and frameworks like Laravel and Symphony, it has improved a lot. It's very fast and with JIT coming in PHP 8 will be even faster.
Other big problem is that is is very easy for beginners. And beginners obviously don't write so good code. This is also reason why many people think that (all) code in PHP is bad.
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