{ stdenv, lib, pkgs, fetchgit, php, autoconf, pkgconfig, re2c
, gettext, bzip2, curl, libxml2, openssl, gmp, icu64, oniguruma, libsodium
, html-tidy, libzip, zlib, pcre, pcre2, libxslt, aspell, openldap, cyrus_sasl
, uwimap, pam, libiconv, enchant1, libXpm, gd, libwebp, libjpeg, libpng
, freetype, libffi, freetds, postgresql, sqlite, net-snmp, unixODBC, libedit
, readline, rsync, fetchpatch
}:

let
  buildPecl = import ../build-support/build-pecl.nix {
    php = php.unwrapped;
    inherit lib;
    inherit (pkgs) stdenv autoreconfHook fetchurl re2c;
  };

  # Wrap mkDerivation to prepend pname with "php-" to make names consistent
  # with how buildPecl does it and make the file easier to overview.
  mkDerivation = { pname, ... }@args: pkgs.stdenv.mkDerivation (args // {
    pname = "php-${pname}";
  });

  isPhp73 = pkgs.lib.versionAtLeast php.version "7.3";
  isPhp74 = pkgs.lib.versionAtLeast php.version "7.4";

  pcre' = if (lib.versionAtLeast php.version "7.3") then pcre2 else pcre;

  callPackage = pkgs.newScope {
    inherit mkDerivation php isPhp73 isPhp74 buildPecl pcre';
  };
in
{
  inherit buildPecl;

  # This is a set of interactive tools based on PHP.
  packages = {
    box = callPackage ../development/php-packages/box { };

    composer = callPackage ../development/php-packages/composer { };

    composer2 = callPackage ../development/php-packages/composer/2.0.nix { };

    php-cs-fixer = callPackage ../development/php-packages/php-cs-fixer { };

    php-parallel-lint = callPackage ../development/php-packages/php-parallel-lint { };

    phpcbf = callPackage ../development/php-packages/phpcbf { };

    phpcs = callPackage ../development/php-packages/phpcs { };

    phpmd = callPackage ../development/php-packages/phpmd { };

    phpstan = callPackage ../development/php-packages/phpstan { };

    psalm = callPackage ../development/php-packages/psalm { };

    psysh = callPackage ../development/php-packages/psysh { };
  };



  # This is a set of PHP extensions meant to be used in php.buildEnv
  # or php.withExtensions to extend the functionality of the PHP
  # interpreter.
  extensions = {
    apcu = callPackage ../development/php-packages/apcu { };

    apcu_bc = callPackage ../development/php-packages/apcu_bc { };

    ast = callPackage ../development/php-packages/ast { };

    blackfire = pkgs.callPackage ../development/tools/misc/blackfire/php-probe.nix { inherit php; };

    couchbase = callPackage ../development/php-packages/couchbase { };

    event = callPackage ../development/php-packages/event { };

    igbinary = callPackage ../development/php-packages/igbinary { };

    imagick = callPackage ../development/php-packages/imagick { };

    mailparse = callPackage ../development/php-packages/mailparse { };

    maxminddb = callPackage ../development/php-packages/maxminddb { };

    memcached = callPackage ../development/php-packages/memcached { };

    mongodb = callPackage ../development/php-packages/mongodb { };

    oci8 = callPackage ../development/php-packages/oci8 { };

    pcov = callPackage ../development/php-packages/pcov { };

    pcs = buildPecl {
      version = "1.3.3";
      pname = "pcs";

      sha256 = "0d4p1gpl8gkzdiv860qzxfz250ryf0wmjgyc8qcaaqgkdyh5jy5p";

      internalDeps = [ php.extensions.tokenizer ];

      meta.maintainers = lib.teams.php.members;
      meta.broken = isPhp73; # Runtime failure on 7.3, build error on 7.4
    };

    pdo_oci = buildPecl rec {
      inherit (php.unwrapped) src version;

      pname = "pdo_oci";
      sourceRoot = "php-${version}/ext/pdo_oci";

      buildInputs = [ pkgs.oracle-instantclient ];
      configureFlags = [ "--with-pdo-oci=instantclient,${pkgs.oracle-instantclient.lib}/lib" ];

      internalDeps = [ php.extensions.pdo ];

      postPatch = ''
        sed -i -e 's|OCISDKMANINC=`.*$|OCISDKMANINC="${pkgs.oracle-instantclient.dev}/include"|' config.m4
      '';

      meta.maintainers = lib.teams.php.members;
    };

    pdo_sqlsrv = buildPecl {
      version = "5.8.1";
      pname = "pdo_sqlsrv";

      sha256 = "06ba4x34fgs092qq9w62y2afsm1nyasqiprirk4951ax9v5vcir0";

      internalDeps = [ php.extensions.pdo ];

      buildInputs = [ pkgs.unixODBC ] ++ pkgs.lib.optionals pkgs.stdenv.isDarwin [ pkgs.libiconv ];

      meta.maintainers = lib.teams.php.members;
    };

    php_excel = buildPecl rec {
      version = "1.0.2";
      pname = "php_excel";
      phpVersion = "php7";

      buildInputs = [ pkgs.libxl ];

      src = pkgs.fetchurl {
        url = "https://github.com/iliaal/php_excel/releases/download/Excel-1.0.2-PHP7/excel-${version}-${phpVersion}.tgz";
        sha256 = "0dpvih9gpiyh1ml22zi7hi6kslkilzby00z1p8x248idylldzs2n";
      };

      configureFlags = [ "--with-excel" "--with-libxl-incdir=${pkgs.libxl}/include_c" "--with-libxl-libdir=${pkgs.libxl}/lib" ];

      meta.maintainers = lib.teams.php.members;
    };

    pinba = let
      version = if isPhp73 then "1.1.2-dev" else "1.1.1";
      src = pkgs.fetchFromGitHub ({
        owner = "tony2001";
        repo = "pinba_extension";
      } // (if (isPhp73) then {
        rev = "edbc313f1b4fb8407bf7d5acf63fbb0359c7fb2e";
        sha256 = "02sljqm6griw8ccqavl23f7w1hp2zflcv24lpf00k6pyrn9cwx80";
      } else {
        rev = "RELEASE_1_1_1";
        sha256 = "1kdp7vav0y315695vhm3xifgsh6h6y6pny70xw3iai461n58khj5";
      }));
    in buildPecl {
      pname = "pinba";
      inherit version src;

      meta = with pkgs.lib; {
        description = "PHP extension for Pinba";
        longDescription = ''
          Pinba is a MySQL storage engine that acts as a realtime monitoring and
          statistics server for PHP using MySQL as a read-only interface.
        '';
        homepage = "http://pinba.org/";
        maintainers = teams.php.members;
      };
    };

    protobuf = buildPecl {
      version = "3.11.2";
      pname = "protobuf";

      sha256 = "0bhdykdyk58ywqj940zb7jyvrlgdr6hdb4s8kn79fz3p0i79l9hz";

      buildInputs = with pkgs; [ pcre' ];

      meta = with pkgs.lib; {
        description = ''
          Google's language-neutral, platform-neutral, extensible mechanism for serializing structured data.
        '';
        license = licenses.bsd3;
        homepage = "https://developers.google.com/protocol-buffers/";
        maintainers = teams.php.members;
      };
    };

    pthreads = let
      version = "3.2.0";
      src = pkgs.fetchFromGitHub ({
        owner = "krakjoe";
        repo = "pthreads";
      } // (if (isPhp73) then {
        rev = "4d1c2483ceb459ea4284db4eb06646d5715e7154";
        sha256 = "07kdxypy0bgggrfav2h1ccbv67lllbvpa3s3zsaqci0gq4fyi830";
      } else {
        rev = "v3.2.0";
        sha256 = "17hypm75d4w7lvz96jb7s0s87018yzmmap0l125d5fd7abnhzfvv";
      }));
    in buildPecl {
      pname = "pthreads";
      inherit version src;

      buildInputs = [ pcre'.dev ];

      meta.broken = isPhp74;
    };

    rdkafka = buildPecl {
      version = "4.0.3";
      pname = "rdkafka";

      sha256 = "1g00p911raxcc7n2w9pzadxaggw5c564md6hjvqfs9ip550y5x16";

      buildInputs = with pkgs; [ rdkafka pcre' ];

      postPhpize = ''
        substituteInPlace configure \
          --replace 'SEARCH_PATH="/usr/local /usr"' 'SEARCH_PATH=${pkgs.rdkafka}'
      '';

      meta = {
        description = "Kafka client based on librdkafka";
        homepage = "https://github.com/arnaud-lb/php-rdkafka";
        maintainers = lib.teams.php.members;
      };
    };

    redis = buildPecl {
      version = "5.1.1";
      pname = "redis";

      sha256 = "1041zv91fkda73w4c3pj6zdvwjgb3q7mxg6mwnq9gisl80mrs732";

      internalDeps = with php.extensions; [
        json
        session
      ] ++ lib.optionals (lib.versionOlder php.version "7.4") [
        hash ];

      meta.maintainers = lib.teams.php.members;
    };

    sqlsrv = buildPecl {
      version = "5.8.1";
      pname = "sqlsrv";

      sha256 = "0c9a6ghch2537vi0274vx0mn6nb1xg2qv7nprnf3xdfqi5ww1i9r";

      buildInputs = [ pkgs.unixODBC ] ++ pkgs.lib.optionals pkgs.stdenv.isDarwin [ pkgs.libiconv ];

      meta.maintainers = lib.teams.php.members;
    };

    v8 = buildPecl {
      version = "0.2.2";
      pname = "v8";

      sha256 = "103nys7zkpi1hifqp9miyl0m1mn07xqshw3sapyz365nb35g5q71";

      buildInputs = [ pkgs.v8_6_x ];
      configureFlags = [ "--with-v8=${pkgs.v8_6_x}" ];

      meta.maintainers = lib.teams.php.members;
      meta.broken = true;
    };

    v8js = buildPecl {
      version = "2.1.0";
      pname = "v8js";

      sha256 = "0g63dyhhicngbgqg34wl91nm3556vzdgkq19gy52gvmqj47rj6rg";

      buildInputs = [ pkgs.v8_6_x ];
      configureFlags = [ "--with-v8js=${pkgs.v8_6_x}" ];

      meta.maintainers = lib.teams.php.members;
      meta.broken = true;
    };

    xdebug = buildPecl {
      version = "2.8.1";
      pname = "xdebug";

      sha256 = "080mwr7m72rf0jsig5074dgq2n86hhs7rdbfg6yvnm959sby72w3";

      doCheck = true;
      checkTarget = "test";

      zendExtension = true;

      meta.maintainers = lib.teams.php.members;
    };

    yaml = buildPecl {
      version = "2.0.4";
      pname = "yaml";

      sha256 = "1036zhc5yskdfymyk8jhwc34kvkvsn5kaf50336153v4dqwb11lp";

      configureFlags = [
        "--with-yaml=${pkgs.libyaml}"
      ];

      nativeBuildInputs = [ pkgs.pkgconfig ];

      meta.maintainers = lib.teams.php.members;
    };

    zmq = buildPecl {
      version = "1.1.3";
      pname = "zmq";

      sha256 = "1kj487vllqj9720vlhfsmv32hs2dy2agp6176mav6ldx31c3g4n4";

      configureFlags = [
        "--with-zmq=${pkgs.zeromq}"
      ];

      nativeBuildInputs = [ pkgs.pkgconfig ];

      meta.maintainers = lib.teams.php.members;
      meta.broken = isPhp73;
    };
  } // (let
    # Function to build a single php extension based on the php version.
    #
    # Name passed is the name of the extension and is automatically used
    # to add the configureFlag "--enable-${name}", which can be overriden.
    #
    # Build inputs is used for extra deps that may be needed. And zendExtension
    # will mark the extension as a zend extension or not.
    mkExtension = {
      name
      , configureFlags ? [ "--enable-${name}" ]
      , internalDeps ? []
      , postPhpize ? ""
      , buildInputs ? []
      , zendExtension ? false
      , doCheck ? true
      , ...
    }@args: stdenv.mkDerivation ((builtins.removeAttrs args [ "name" ]) // {
      pname = "php-${name}";
      extensionName = name;

      inherit (php.unwrapped) version src;
      sourceRoot = "php-${php.version}/ext/${name}";

      enableParallelBuilding = true;
      nativeBuildInputs = [ php.unwrapped autoconf pkgconfig re2c ];
      inherit configureFlags internalDeps buildInputs
        zendExtension doCheck;

      prePatch = "pushd ../..";
      postPatch = "popd";

      preConfigure = ''
        nullglobRestore=$(shopt -p nullglob)
        shopt -u nullglob   # To make ?-globbing work

        # Some extensions have a config0.m4 or config9.m4
        if [ -f config?.m4 ]; then
          mv config?.m4 config.m4
        fi

        $nullglobRestore
        phpize
        ${postPhpize}
        ${lib.concatMapStringsSep "\n"
          (dep: "mkdir -p ext; ln -s ${dep.dev}/include ext/${dep.extensionName}")
          internalDeps}
      '';
      checkPhase = "echo n | make test";
      outputs = [ "out" "dev" ];
      installPhase = ''
        mkdir -p $out/lib/php/extensions
        cp modules/${name}.so $out/lib/php/extensions/${name}.so
        mkdir -p $dev/include
        ${rsync}/bin/rsync -r --filter="+ */" \
                              --filter="+ *.h" \
                              --filter="- *" \
                              --prune-empty-dirs \
                              . $dev/include/
      '';

      meta = {
        description = "PHP upstream extension: ${name}";
        inherit (php.meta) maintainers homepage license;
      };
    });

    # This list contains build instructions for different modules that one may
    # want to build.
    #
    # These will be passed as arguments to mkExtension above.
    extensionData = [
      { name = "bcmath"; }
      { name = "bz2"; buildInputs = [ bzip2 ]; configureFlags = [ "--with-bz2=${bzip2.dev}" ]; }
      { name = "calendar"; }
      { name = "ctype"; }
      { name = "curl";
        buildInputs = [ curl ];
        configureFlags = [ "--with-curl=${curl.dev}" ];
        doCheck = false; }
      { name = "dba"; }
      { name = "dom";
        buildInputs = [ libxml2 ];
        configureFlags = [ "--enable-dom" ]
          # Required to build on darwin.
          ++ lib.optional (lib.versionOlder php.version "7.4") [ "--with-libxml-dir=${libxml2.dev}" ]; }
      { name = "enchant";
        buildInputs = [ enchant1 ];
        configureFlags = [ "--with-enchant=${enchant1}" ];
        # enchant1 doesn't build on darwin.
        enable = (!stdenv.isDarwin);
        doCheck = false; }
      { name = "exif"; doCheck = false; }
      { name = "ffi"; buildInputs = [ libffi ]; enable = lib.versionAtLeast php.version "7.4"; }
      { name = "fileinfo"; buildInputs = [ pcre' ]; }
      { name = "filter"; buildInputs = [ pcre' ]; }
      { name = "ftp"; buildInputs = [ openssl ]; }
      { name = "gd";
        buildInputs = [ zlib gd ];
        configureFlags = [
          "--enable-gd"
          "--with-external-gd=${gd.dev}"
          "--enable-gd-jis-conv"
        ];
        doCheck = false;
        enable = lib.versionAtLeast php.version "7.4"; }
      { name = "gd";
        buildInputs = [ zlib gd libXpm ];
        configureFlags = [
          "--with-gd=${gd.dev}"
          "--with-freetype-dir=${freetype.dev}"
          "--with-jpeg-dir=${libjpeg.dev}"
          "--with-png-dir=${libpng.dev}"
          "--with-webp-dir=${libwebp}"
          "--with-xpm-dir=${libXpm.dev}"
          "--with-zlib-dir=${zlib.dev}"
          "--enable-gd-jis-conv"
        ];
        doCheck = false;
        enable = lib.versionOlder php.version "7.4"; }
      { name = "gettext";
        buildInputs = [ gettext ];
        patches = lib.optionals (lib.versionOlder php.version "7.4") [
          (fetchpatch {
            url = "https://github.com/php/php-src/commit/632b6e7aac207194adc3d0b41615bfb610757f41.patch";
            sha256 = "0xn3ivhc4p070vbk5yx0mzj2n7p04drz3f98i77amr51w0vzv046";
          })
        ];
        postPhpize = ''substituteInPlace configure --replace 'as_fn_error $? "Cannot locate header file libintl.h" "$LINENO" 5' ':' '';
        configureFlags = "--with-gettext=${gettext}"; }
      { name = "gmp";
        buildInputs = [ gmp ];
        configureFlags = [ "--with-gmp=${gmp.dev}" ]; }
      { name = "hash"; enable = lib.versionOlder php.version "7.4"; }
      { name = "iconv";
        configureFlags = if stdenv.isDarwin then
                           [ "--with-iconv=${libiconv}" ]
                         else
                           [ "--with-iconv" ];
        doCheck = false; }
      { name = "imap";
        buildInputs = [ uwimap openssl pam pcre' ];
        configureFlags = [ "--with-imap=${uwimap}" "--with-imap-ssl" ];
        # uwimap doesn't build on darwin.
        enable = (!stdenv.isDarwin); }
      # interbase (7.3, 7.2)
      { name = "intl";
        buildInputs = [ icu64 ];
        patches = lib.optional (lib.versionOlder php.version "7.4") (fetchpatch {
          url = "https://github.com/php/php-src/commit/93a9b56c90c334896e977721bfb3f38b1721cec6.patch";
          sha256 = "055l40lpyhb0rbjn6y23qkzdhvpp7inbnn6x13cpn4inmhjqfpg4";
        });
      }
      { name = "json"; }
      { name = "ldap";
        buildInputs = [ openldap cyrus_sasl ];
        configureFlags = [
          "--with-ldap"
          "LDAP_DIR=${openldap.dev}"
          "LDAP_INCDIR=${openldap.dev}/include"
          "LDAP_LIBDIR=${openldap.out}/lib"
        ] ++ lib.optional stdenv.isLinux "--with-ldap-sasl=${cyrus_sasl.dev}";
        doCheck = false; }
      { name = "mbstring"; buildInputs = [ oniguruma ]; doCheck = false; }
      { name = "mysqli";
        internalDeps = [ php.extensions.mysqlnd ];
        configureFlags = [ "--with-mysqli=mysqlnd" "--with-mysql-sock=/run/mysqld/mysqld.sock" ];
        doCheck = false; }
      { name = "mysqlnd";
        buildInputs = [ zlib openssl ];
        # The configure script doesn't correctly add library link
        # flags, so we add them to the variable used by the Makefile
        # when linking.
        MYSQLND_SHARED_LIBADD = "-lssl -lcrypto";
        # The configure script builds a config.h which is never
        # included. Let's include it in the main header file
        # included by all .c-files.
        patches = [
          (pkgs.writeText "mysqlnd_config.patch" ''
            --- a/ext/mysqlnd/mysqlnd.h
            +++ b/ext/mysqlnd/mysqlnd.h
            @@ -1,3 +1,6 @@
            +#ifdef HAVE_CONFIG_H
            +#include "config.h"
            +#endif
             /*
               +----------------------------------------------------------------------+
               | Copyright (c) The PHP Group                                          |
          '')
        ] ++ lib.optional (lib.versionOlder php.version "7.4.8") [
          (pkgs.writeText "mysqlnd_fix_compression.patch" ''
            --- a/ext/mysqlnd/mysqlnd.h
            +++ b/ext/mysqlnd/mysqlnd.h
            @@ -48,7 +48,7 @@
             #define MYSQLND_DBG_ENABLED 0
             #endif

            -#if defined(MYSQLND_COMPRESSION_WANTED) && defined(HAVE_ZLIB)
            +#if defined(MYSQLND_COMPRESSION_WANTED)
             #define MYSQLND_COMPRESSION_ENABLED 1
             #endif
          '')
        ];
        postPhpize = lib.optionalString (lib.versionOlder php.version "7.4") ''
          substituteInPlace configure --replace '$OPENSSL_LIBDIR' '${openssl}/lib' \
                                      --replace '$OPENSSL_INCDIR' '${openssl.dev}/include'
        ''; }
      # oci8 (7.4, 7.3, 7.2)
      # odbc (7.4, 7.3, 7.2)
      { name = "opcache";
        buildInputs = [ pcre' ];
        # HAVE_OPCACHE_FILE_CACHE is defined in config.h, which is
        # included from ZendAccelerator.h, but ZendAccelerator.h is
        # included after the ifdef...
        patches = lib.optional (lib.versionOlder php.version "7.4") [
          (pkgs.writeText "zend_file_cache_config.patch" ''
            --- a/ext/opcache/zend_file_cache.c
            +++ b/ext/opcache/zend_file_cache.c
            @@ -27,9 +27,9 @@
             #include "ext/standard/md5.h"
             #endif

            +#include "ZendAccelerator.h"
             #ifdef HAVE_OPCACHE_FILE_CACHE

            -#include "ZendAccelerator.h"
             #include "zend_file_cache.h"
             #include "zend_shared_alloc.h"
             #include "zend_accelerator_util_funcs.h"
          '') ];
        zendExtension = true;
        doCheck = !(lib.versionOlder php.version "7.4"); }
      { name = "openssl";
        buildInputs = [ openssl ];
        configureFlags = [ "--with-openssl" ];
        doCheck = false; }
      { name = "pcntl"; }
      { name = "pdo"; doCheck = false; }
      { name = "pdo_dblib";
        internalDeps = [ php.extensions.pdo ];
        configureFlags = [ "--with-pdo-dblib=${freetds}" ];
        # Doesn't seem to work on darwin.
        enable = (!stdenv.isDarwin);
        doCheck = false; }
      # pdo_firebird (7.4, 7.3, 7.2)
      { name = "pdo_mysql";
        internalDeps = with php.extensions; [ pdo mysqlnd ];
        configureFlags = [ "--with-pdo-mysql=mysqlnd" "PHP_MYSQL_SOCK=/run/mysqld/mysqld.sock" ];
        doCheck = false; }
      # pdo_oci (7.4, 7.3, 7.2)
      { name = "pdo_odbc";
        internalDeps = [ php.extensions.pdo ];
        configureFlags = [ "--with-pdo-odbc=unixODBC,${unixODBC}" ];
        doCheck = false; }
      { name = "pdo_pgsql";
        internalDeps = [ php.extensions.pdo ];
        configureFlags = [ "--with-pdo-pgsql=${postgresql}" ];
        doCheck = false; }
      { name = "pdo_sqlite";
        internalDeps = [ php.extensions.pdo ];
        buildInputs = [ sqlite ];
        configureFlags = [ "--with-pdo-sqlite=${sqlite.dev}" ];
        doCheck = false; }
      { name = "pgsql";
        buildInputs = [ pcre' ];
        configureFlags = [ "--with-pgsql=${postgresql}" ];
        doCheck = false; }
      { name = "posix"; doCheck = false; }
      { name = "pspell"; configureFlags = [ "--with-pspell=${aspell}" ]; }
      { name = "readline";
        buildInputs = [ libedit readline ];
        configureFlags = [ "--with-readline=${readline.dev}" ];
        postPhpize = lib.optionalString (lib.versionOlder php.version "7.4") ''
          substituteInPlace configure --replace 'as_fn_error $? "Please reinstall libedit - I cannot find readline.h" "$LINENO" 5' ':'
        '';
        doCheck = false;
      }
      # recode (7.3, 7.2)
      { name = "session"; }
      { name = "shmop"; }
      { name = "simplexml";
        buildInputs = [ libxml2 pcre' ];
        configureFlags = [ "--enable-simplexml" ]
          # Required to build on darwin.
          ++ lib.optional (lib.versionOlder php.version "7.4") [ "--with-libxml-dir=${libxml2.dev}" ]; }
      { name = "snmp";
        buildInputs = [ net-snmp openssl ];
        configureFlags = [ "--with-snmp" ];
        # net-snmp doesn't build on darwin.
        enable = (!stdenv.isDarwin);
        doCheck = false; }
      { name = "soap";
        buildInputs = [ libxml2 ];
        configureFlags = [ "--enable-soap" ]
          # Required to build on darwin.
          ++ lib.optional (lib.versionOlder php.version "7.4") [ "--with-libxml-dir=${libxml2.dev}" ];
        doCheck = false; }
      { name = "sockets"; doCheck = false; }
      { name = "sodium"; buildInputs = [ libsodium ]; }
      { name = "sqlite3"; buildInputs = [ sqlite ]; }
      { name = "sysvmsg"; }
      { name = "sysvsem"; }
      { name = "sysvshm"; }
      { name = "tidy"; configureFlags = [ "--with-tidy=${html-tidy}" ]; doCheck = false; }
      { name = "tokenizer"; }
      { name = "wddx";
        buildInputs = [ libxml2 ];
        internalDeps = [ php.extensions.session ];
        configureFlags = [ "--enable-wddx" "--with-libxml-dir=${libxml2.dev}" ];
        # Removed in php 7.4.
        enable = lib.versionOlder php.version "7.4"; }
      { name = "xml";
        buildInputs = [ libxml2 ];
        configureFlags = [ "--enable-xml" ]
          # Required to build on darwin.
          ++ lib.optional (lib.versionOlder php.version "7.4") [ "--with-libxml-dir=${libxml2.dev}" ];
        doCheck = false; }
      { name = "xmlreader";
        buildInputs = [ libxml2 ];
        configureFlags = [ "--enable-xmlreader CFLAGS=-I../.." ]
          # Required to build on darwin.
          ++ lib.optional (lib.versionOlder php.version "7.4") [ "--with-libxml-dir=${libxml2.dev}" ]; }
      { name = "xmlrpc";
        buildInputs = [ libxml2 libiconv ];
        configureFlags = [ "--with-xmlrpc" ]
          # Required to build on darwin.
          ++ lib.optional (lib.versionOlder php.version "7.4") [ "--with-libxml-dir=${libxml2.dev}" ]; }
      { name = "xmlwriter";
        buildInputs = [ libxml2 ];
        configureFlags = [ "--enable-xmlwriter" ]
          # Required to build on darwin.
          ++ lib.optional (lib.versionOlder php.version "7.4") [ "--with-libxml-dir=${libxml2.dev}" ]; }
      { name = "xsl";
        buildInputs = [ libxslt libxml2 ];
        doCheck = !(lib.versionOlder php.version "7.4");
        configureFlags = [ "--with-xsl=${libxslt.dev}" ]; }
      { name = "zend_test"; }
      { name = "zip";
        buildInputs = [ libzip pcre' ];
        configureFlags = [ "--with-zip" ]
          ++ lib.optional (lib.versionOlder php.version "7.4") [ "--with-zlib-dir=${zlib.dev}" ]
          ++ lib.optional (lib.versionOlder php.version "7.3") [ "--with-libzip" ];
        doCheck = false; }
      { name = "zlib";
        buildInputs = [ zlib ];
        patches = lib.optionals (lib.versionOlder php.version "7.4") [
          # Derived from https://github.com/php/php-src/commit/f16b012116d6c015632741a3caada5b30ef8a699
          ../development/interpreters/php/zlib-darwin-tests.patch
        ];
        configureFlags = [ "--with-zlib" ]
          ++ lib.optional (lib.versionOlder php.version "7.4") [ "--with-zlib-dir=${zlib.dev}" ]; }
    ];

    # Convert the list of attrs:
    # [ { name = <name>; ... } ... ]
    # to a list of
    # [ { name = <name>; value = <extension drv>; } ... ]
    #
    # which we later use listToAttrs to make all attrs available by name.
    #
    # Also filter out extensions based on the enable property.
    namedExtensions = builtins.map (drv: {
      name = drv.name;
      value = mkExtension drv;
    }) (builtins.filter (i: i.enable or true) extensionData);

    # Produce the final attribute set of all extensions defined.
  in builtins.listToAttrs namedExtensions);
}