PHP is not suitable for giant content-based web applications.
Since it is open-source, it is not SECURE. Because ASCII text files are EASILY available.
Change or modification in the core behavior of online applications is not allowed by PHP.
If we use more features of the PHP framework and tools, it will cause poor performance of online applications.
PHP features a poor quality of handling errors. PHP lacks debugging tools, which are needed to look for WARNINGS and errors. It has only a few debugging tools in COMPARISON to other programming languages.