diff --git a/nixos/tests/all-tests.nix b/nixos/tests/all-tests.nix
index 12f8954c4040..ffc3408d1652 100644
--- a/nixos/tests/all-tests.nix
+++ b/nixos/tests/all-tests.nix
@@ -763,6 +763,7 @@ in {
   php81 = handleTest ./php { php = pkgs.php81; };
   php82 = handleTest ./php { php = pkgs.php82; };
   php83 = handleTest ./php { php = pkgs.php83; };
+  php84 = handleTest ./php { php = pkgs.php84; };
   phylactery = handleTest ./web-apps/phylactery.nix {};
   pict-rs = handleTest ./pict-rs.nix {};
   pinnwand = handleTest ./pinnwand.nix {};
diff --git a/pkgs/development/interpreters/php/8.4.nix b/pkgs/development/interpreters/php/8.4.nix
new file mode 100644
index 000000000000..9c6fd1d39288
--- /dev/null
+++ b/pkgs/development/interpreters/php/8.4.nix
@@ -0,0 +1,61 @@
+{ callPackage, fetchurl, ... }@_args:
+
+let
+  base = callPackage ./generic.nix (
+    _args
+    // {
+      version = "8.4.0alpha4";
+      phpSrc = fetchurl {
+        url = "https://downloads.php.net/~saki/php-8.4.0alpha4.tar.xz";
+        hash = "sha256-v411aNKrbteDZnkfpai8SqUgWFQbqZJbzPF5mdCr2Og=";
+      };
+    }
+  );
+in
+base.withExtensions (
+  { all, ... }:
+  with all;
+  [
+    bcmath
+    calendar
+    curl
+    ctype
+    dom
+    exif
+    fileinfo
+    filter
+    ftp
+    gd
+    gettext
+    gmp
+    iconv
+    intl
+    ldap
+    mbstring
+    mysqli
+    mysqlnd
+    opcache
+    openssl
+    pcntl
+    pdo
+    pdo_mysql
+    pdo_odbc
+    pdo_pgsql
+    pdo_sqlite
+    pgsql
+    posix
+    readline
+    session
+    simplexml
+    sockets
+    soap
+    sodium
+    sysvsem
+    sqlite3
+    tokenizer
+    xmlreader
+    xmlwriter
+    zip
+    zlib
+  ]
+)
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 051d8b0676a6..2e5fd6420ee5 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -16854,6 +16854,16 @@ with pkgs;
   phpExtensions = php.extensions;
   phpPackages = php.packages;
 
+  # Import PHP84 interpreter, extensions and packages
+  php84 = callPackage ../development/interpreters/php/8.4.nix {
+    stdenv = if stdenv.cc.isClang then llvmPackages.stdenv else stdenv;
+    pcre2 = pcre2.override {
+      withJitSealloc = false; # See https://bugs.php.net/bug.php?id=78927 and https://bugs.php.net/bug.php?id=78630
+    };
+  };
+  php84Extensions = recurseIntoAttrs php84.extensions;
+  php84Packages = recurseIntoAttrs php84.packages;
+
   # Import PHP83 interpreter, extensions and packages
   php83 = callPackage ../development/interpreters/php/8.3.nix {
     stdenv = if stdenv.cc.isClang then llvmPackages.stdenv else stdenv;
diff --git a/pkgs/top-level/php-packages.nix b/pkgs/top-level/php-packages.nix
index 1c4903915b37..d6d2af5850d0 100644
--- a/pkgs/top-level/php-packages.nix
+++ b/pkgs/top-level/php-packages.nix
@@ -409,6 +409,14 @@ in {
               hash = "sha256-sodGODHb4l04P0srn3L8l3K+DjZzCsCNbamfkmIyF+k=";
               excludes = [ "NEWS" ];
             })
+          ] ++ lib.optionals (lib.versions.majorMinor php.version == "8.4") [
+            # Fix compatibility with libxml2 ≥ 2.13.2
+            # https://github.com/php/php-src/issues/15331
+            (fetchpatch {
+              url = "https://github.com/php/php-src/commit/8d7365b6f009ba43e305d6459013ac4fbed7c606.diff?full_index=1";
+              hash = "sha256-ct0Ml9kjjcRLryjxMsUQQsDXiDExjpnCnWKf+mYgTsQ=";
+              excludes = [ "NEWS" ];
+            })
           ];
         }
         {