SplObjectStorage is a set of objects with O(1) membership, and it holds a strong reference to everything in it. It is genuinely the right tool for cycle detection…
str_contains takes one needle, deliberately, and the array version everybody wants was rejected during the RFC. The argument against an array form was ambiguity — any or all…
Xdebug 3 replaced half a dozen independent toggles with one mode setting, and most documentation still describes the 2.x names. The port change from 9000 to 9003 is…
InnoDB detects a deadlock, kills one transaction and returns an error, and an application that treats that as a bug will treat a normal event as an outage.…
switch compares loosely, falls through by default and is a statement rather than an expression, and all three of those have produced bugs in code that looked correct.…
strpos returns a position, position zero is falsy, and the strict comparison that fixes it is not memorable enough to survive a tidy-up. This has been the single…
A chain of null checks reads badly and the operator that replaces them is genuinely better — and it makes one specific mistake easier to write. Short-circuiting the…