What aspects or features of PHP can cause inconvenience for developers?

PHP has a number of features that can cause inconvenience for developers:

• Inconsistent syntax: The language has many outdated constructs and functions with different naming styles, which makes reading and maintaining code difficult.

• Weak typing: The lack of strict typing can lead to unexpected errors during execution.

• Global state: Previously, global variables and superglobal arrays were widely used, complicating application state management.

• Security: By default, PHP does not always ensure safe data handling, requiring additional attention to protect against SQL injections, XSS, and other vulnerabilities.

• Variety of programming styles: Due to the long history of the language and many developers, code can be written in different styles, making standardization difficult.

• Performance: Although PHP is constantly improving, in some cases it lags behind other languages in performance.

These aspects require developers to be attentive and disciplined when writing and maintaining PHP code.