diff --git a/pkgs/build-support/build-pecl.nix b/pkgs/build-support/build-pecl.nix
index d08f8822d75..a1030e3b34f 100644
--- a/pkgs/build-support/build-pecl.nix
+++ b/pkgs/build-support/build-pecl.nix
@@ -1,4 +1,4 @@
-{ stdenv, php, autoreconfHook, fetchurl }:
+{ stdenv, php, autoreconfHook, fetchurl, re2c }:
 
 { pname
 , version
@@ -17,7 +17,7 @@ stdenv.mkDerivation (args // {
 
   inherit src;
 
-  nativeBuildInputs = [ autoreconfHook ] ++ nativeBuildInputs;
+  nativeBuildInputs = [ autoreconfHook re2c ] ++ nativeBuildInputs;
   buildInputs = [ php ] ++ buildInputs;
 
   makeFlags = [ "EXTENSION_DIR=$(out)/lib/php/extensions" ] ++ makeFlags;
diff --git a/pkgs/development/interpreters/php/default.nix b/pkgs/development/interpreters/php/default.nix
index 9a6b2f99f4a..a4a0b41210a 100644
--- a/pkgs/development/interpreters/php/default.nix
+++ b/pkgs/development/interpreters/php/default.nix
@@ -1,10 +1,10 @@
 # pcre functionality is tested in nixos/tests/php-pcre.nix
-{ lib, stdenv, fetchurl, flex, bison, autoconf
+{ lib, stdenv, fetchurl, autoconf, bison, libtool, pkgconfig, re2c
 , mysql, libxml2, readline, zlib, curl, postgresql, gettext
-, openssl, pcre, pcre2, pkgconfig, sqlite, config, libjpeg, libpng, freetype
+, openssl, pcre, pcre2, sqlite, config, libjpeg, libpng, freetype
 , libxslt, libmcrypt, bzip2, icu, openldap, cyrus_sasl, libmhash, unixODBC
 , uwimap, pam, gmp, apacheHttpd, libiconv, systemd, libsodium, html-tidy, libargon2
-, libzip, re2c, valgrind
+, libzip, valgrind
 }:
 
 with lib;
@@ -48,7 +48,7 @@ let
   , ftpSupport ? config.php.ftp or true
   , fpmSupport ? config.php.fpm or true
   , gmpSupport ? config.php.gmp or true
-  , ztsSupport ? config.php.zts or false
+  , ztsSupport ? (config.php.zts or false) || (apxs2Support)
   , calendarSupport ? config.php.calendar or true
   , sodiumSupport ? (config.php.sodium or true) && (versionAtLeast version "7.2")
   , tidySupport ? (config.php.tidy or false)
@@ -59,10 +59,8 @@ let
   , cliSupport ? config.php.cli or true
   , pharSupport ? config.php.phar or true
   , xmlrpcSupport ? (config.php.xmlrpc or false) && (libxml2Support)
-  , re2cSupport ? config.php.re2c or true
-  , cgotoSupport ? (config.php.cgoto or false) && (re2cSupport)
+  , cgotoSupport ? config.php.cgoto or false
   , valgrindSupport ? (config.php.valgrind or true) && (versionAtLeast version "7.2")
-  , valgrindPcreSupport ? (config.php.valgrindPcreSupport or false) && (valgrindSupport) && (versionAtLeast version "7.2")
   }:
 
     let
@@ -76,8 +74,8 @@ let
 
       enableParallelBuilding = true;
 
-      nativeBuildInputs = [ pkgconfig autoconf ];
-      buildInputs = [ flex bison ]
+      nativeBuildInputs = [ autoconf bison libtool pkgconfig re2c ];
+      buildInputs = [ ]
         ++ optional (versionOlder version "7.3") pcre
         ++ optional (versionAtLeast version "7.3") pcre2
         ++ optional withSystemd systemd
@@ -108,7 +106,6 @@ let
         ++ optional tidySupport html-tidy
         ++ optional argon2Support libargon2
         ++ optional libzipSupport libzip
-        ++ optional re2cSupport re2c
         ++ optional valgrindSupport valgrind;
 
       CXXFLAGS = optional stdenv.cc.isClang "-std=c++11";
@@ -192,8 +189,7 @@ let
       ++ optional (!pharSupport) "--disable-phar"
       ++ optional xmlrpcSupport "--with-xmlrpc"
       ++ optional cgotoSupport "--enable-re2c-cgoto"
-      ++ optional valgrindSupport "--with-valgrind=${valgrind.dev}"
-      ++ optional valgrindPcreSupport "--with-pcre-valgrind";
+      ++ optional valgrindSupport "--with-valgrind=${valgrind.dev}";
 
       hardeningDisable = [ "bindnow" ];
 
diff --git a/pkgs/top-level/php-packages.nix b/pkgs/top-level/php-packages.nix
index 119b99c3a56..114b107418d 100644
--- a/pkgs/top-level/php-packages.nix
+++ b/pkgs/top-level/php-packages.nix
@@ -4,7 +4,7 @@ let
   self = with self; {
     buildPecl = import ../build-support/build-pecl.nix {
       inherit php;
-      inherit (pkgs) stdenv autoreconfHook fetchurl;
+      inherit (pkgs) stdenv autoreconfHook fetchurl re2c;
     };
 
     # Wrap mkDerivation to prepend pname with "php-" to make names consistent
@@ -73,12 +73,12 @@ let
   };
 
   composer = mkDerivation rec {
-    version = "1.8.5";
+    version = "1.8.6";
     pname = "composer";
 
     src = pkgs.fetchurl {
       url = "https://getcomposer.org/download/${version}/composer.phar";
-      sha256 = "05qfgh2dz8pjf47ndyhkicqbnqzwypk90cczd4c6d8jl9gbiqk2f";
+      sha256 = "0hnm7njab9nsifpb1qbwx54yfpsi00g8mzny11s13ibjvd9rnvxn";
     };
 
     unpackPhase = ":";
@@ -143,12 +143,17 @@ let
   };
 
   event = buildPecl rec {
-    version = "2.5.1";
+    version = "2.5.2";
     pname = "event";
 
-    sha256 = "0hnvmlbl994fjliqc3c65gv6f6syh9zmlfcbizqs3k67bbmkhiad";
+    sha256 = "0b9zbwyyfcrzs1gcpqn2dkjq6jliw89g2m981f8ildbp84snkpcf";
 
-    configureFlags = [ "--with-event-libevent-dir=${pkgs.libevent.dev}" ];
+    configureFlags = [
+      "--with-event-libevent-dir=${pkgs.libevent.dev}"
+      "--with-event-core"
+      "--with-event-extra"
+      "--with-event-pthreads"
+    ];
     nativeBuildInputs = [ pkgs.pkgconfig ];
     buildInputs = with pkgs; [ openssl libevent ];
 
@@ -216,7 +221,7 @@ let
 
     sha256 = "0jhivxj1nkkza4h23z33y7xhffii60d7dr51h1czjk10qywl7pyd";
 
-    buildInputs = [ pkgs.re2c pkgs.oracle-instantclient ];
+    buildInputs = [ pkgs.oracle-instantclient ];
     configureFlags = [ "--with-oci8=shared,instantclient,${pkgs.oracle-instantclient}/lib" ];
   };