Stacks
7 min · PHP examples
Last-in-first-out structure for matching brackets, undo logic, and monotonic scans.
PHP · Stacks0/5 cleared
Enemy 1 of 5
A stack is like a pile of plates: you push on top and pop from the top. PHP arrays work great — array_push() (or $stack[] = ...) to push, array_pop() to pop.
Classic use: walk a string of brackets and push opens; on a close, pop and check they match.
You
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Ln 1, Col 1Spaces: 4
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