Collatz in PHP in bytes. Cheevos Holes Recent Holes Langs Medals Misc All Holes 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Morse Decoder Morse Encoder Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Apéry’s Constant Calendar Connect Four CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers Minesweeper NFA Simulator Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Turtle Tutorial All Languages ><> Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig 05AB1E ALGOL 68 APL Arturo Befunge BQN CJam CoffeeScript Egel Erlang Fennel Harbour Hare Haxe Hush Hy iogii Knight Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Bytes Chars Scoring Bytes Chars Language All ><> Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig Experimental Language 05AB1E ALGOL 68 APL Arturo Befunge BQN CJam CoffeeScript Egel Erlang Fennel Harbour Hare Haxe Hush Hy iogii Knight Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Hole All 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Morse Decoder Morse Encoder Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Experimental Hole Apéry’s Constant Calendar Connect Four CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers Minesweeper NFA Simulator Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Turtle Tutorial # Golfer Points Bytes Time Submitted 1st Lydxn 🇨🇦 1,000 59 11ms 6 May 2022 2nd emplv 🇱🇻 983 60 13ms 5 May 2022 2nd GrayJoKing 🇦🇺 983 60 11ms 6 May 2022 2nd targrik 983 60 9ms 24 Dec 2024 2nd xsot 🇸🇬 983 60 12ms 1 May 2025 6th primo-ppcg 🇹🇭 967 61 7ms 6 May 2022 6th sisyphus-ppcg 🇦🇺 967 61 11ms 14 Jul 2022 8th DialFrost 🇸🇬 894 66 95ms 7 Apr 2025 9th sean-niemann 🇺🇸 881 67 10ms 5 May 2022 9th pschmid0 🇺🇸 881 67 6ms 5 Aug 2022 9th arobson13 🇨🇦 881 67 6ms 11 Apr 2023 9th janbehrens 🇩🇪 881 67 10ms 17 May 2023 13th stefangimmillaro 868 68 6ms 2 Oct 2022 13th Shanethegamer 🇺🇸 868 68 12ms 17 May 2023 15th Betuaredead 855 69 6ms 5 Jan 2023 15th MeWhenI 🇻🇦 855 69 6ms 28 May 2023 17th JustinHodge 843 70 6ms 18 Aug 2022 17th KrausRaus 🇺🇸 843 70 6ms 7 Sep 2022 17th Salutations45 843 70 13ms 21 Nov 2024 20th zelenovas 🇷🇺 831 71 8ms 8 Feb 2023 21st josh-h-90 819 72 8ms 13 Sep 2022 21st edsrzf 🇳🇿 819 72 9ms 27 Sep 2024 21st dokutan 819 72 6ms 10 Apr 2025 24th tkr-sh 🇫🇷 808 73 7ms 8 Sep 2022 24th ArtemBrovko 808 73 6ms 12 Jul 2023 24th Kokusui 🇯🇵 808 73 8ms 22 Jul 2024 27th satutalo 🇫🇮 797 74 9ms 22 Nov 2022 27th madeforlosers 797 74 7ms 22 Nov 2024 29th jzawadzki 766 77 6ms 25 Feb 2023 30th infostreams 756 78 6ms 12 Jul 2023 30th fischfood 756 78 6ms 15 Aug 2024 32nd didion0 🇺🇸 738 80 6ms 5 May 2022 32nd Natanaelel 🇸🇪 738 80 7ms 17 Jun 2022 32nd hossammohammed72 738 80 6ms 12 Jul 2023 35th aminrnd 728 81 6ms 13 Jul 2023 35th ybrodala 728 81 8ms 14 Aug 2024 37th hossain-iqbal 720 82 6ms 13 Jul 2023 38th shaunjc 711 83 8ms 17 Feb 2023 38th blaztoma 🇱🇹 711 83 6ms 27 days ago 40th jbirchevans 702 84 5ms 2 Aug 2023 41st RossBambrey 670 88 6ms 21 Nov 2023 42nd snoozingnewt 🇺🇸 656 90 6ms 11 Sep 2023 42nd mrmena 🇦🇺 656 90 6ms 19 Mar 2024 42nd kmathis22 656 90 7ms 10 Sep 2025 45th jessegyger 634 93 6ms 5 Oct 2022 46th AlexanderFair 615 96 7ms 11 Aug 2023 46th liviucerchez 615 96 6ms 20 Oct 2023 48th piripasa 608 97 8ms 12 Jul 2023 49th StronkCheese 🇺🇸 596 99 8ms 18 Feb 2023 49th msbranicky 596 99 6ms 8 Sep 2023 51st Meri-Dax 567 104 6ms 8 Jun 2022 52nd Bodo171 447 132 6ms 6 Dec 2022 53rd kevinnaviapaiva 376 157 7ms 6 Mar 2025 54th ahmedsliman 263 224 6ms 12 Jul 2023 55th retrohun 18 3,229 4ms 27 Dec 2022 56th JRaspass 🇬🇧 18 3,231 5ms 4 May 2022 56th kurkale6ka 18 3,231 4ms 3 Jan 2024 56th HumanoidCPU 18 3,231 4ms 3 May 2024 56th Mabeloid 🇳🇴 18 3,231 5ms 17 Sep 2024 56th CaedenHarper 🇨🇦 18 3,231 4ms 16 Aug 2025 61st KatieLG 🇬🇧 14 4,230 4ms 4 May 2022 61st KatieLG-Transpiler 🇬🇧 14 4,230 4ms 24 Jun 2022 1–62 of 62