Fix php jenkins test (#3233)

Update commit id to upload latest composer.
Compile php with bc-math for future json support.

jenkins/docker/Dockerfile

@@ -145,7 +145,7 @@ RUN mv mirror php-5.5.38.tar.bz2
 RUN tar -xvf php-5.5.38.tar.bz2
 RUN cd php-5.5.38 && ./configure --enable-maintainer-zts --prefix=/usr/local/php-5.5-zts && \
     make && make install && cd ..
-RUN cd php-5.5.38 && make clean && ./configure --prefix=/usr/local/php-5.5 && \
+RUN cd php-5.5.38 && make clean && ./configure --enable-bcmath --prefix=/usr/local/php-5.5 && \
     make && make install && cd ..
 
 RUN wget http://am1.php.net/get/php-5.6.30.tar.bz2/from/this/mirror
@@ -153,7 +153,7 @@ RUN mv mirror php-5.6.30.tar.bz2
 RUN tar -xvf php-5.6.30.tar.bz2
 RUN cd php-5.6.30 && ./configure --enable-maintainer-zts --prefix=/usr/local/php-5.6-zts && \
     make && make install && cd ..
-RUN cd php-5.6.30 && make clean && ./configure --prefix=/usr/local/php-5.6 && \
+RUN cd php-5.6.30 && make clean && ./configure --enable-bcmath --prefix=/usr/local/php-5.6 && \
     make && make install && cd ..
 
 RUN wget http://am1.php.net/get/php-7.0.18.tar.bz2/from/this/mirror
@@ -161,7 +161,7 @@ RUN mv mirror php-7.0.18.tar.bz2
 RUN tar -xvf php-7.0.18.tar.bz2
 RUN cd php-7.0.18 && ./configure --enable-maintainer-zts --prefix=/usr/local/php-7.0-zts && \
     make && make install && cd ..
-RUN cd php-7.0.18 && make clean && ./configure --prefix=/usr/local/php-7.0 && \
+RUN cd php-7.0.18 && make clean && ./configure --enable-bcmath --prefix=/usr/local/php-7.0 && \
     make && make install && cd ..
 
 RUN php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
@@ -174,7 +174,7 @@ RUN cd /tmp && \
   rm -rf protobuf && \
   git clone https://github.com/google/protobuf.git && \
   cd protobuf && \
-  git reset --hard 6b27c1f981a9a93918e4039f236ead27165a8e91 && \
+  git reset --hard 8d97b3d8b5a33650e822460b3b561802c969e86e && \
   cd php && \
   ln -sfn /usr/local/php-5.5/bin/php /usr/bin/php && \
   ln -sfn /usr/local/php-5.5/bin/php-config /usr/bin/php-config && \

jenkins/docker32/Dockerfile

@@ -64,7 +64,7 @@ RUN php -r "unlink('composer-setup.php');"
 RUN cd /tmp && \
   git clone https://github.com/google/protobuf.git && \
   cd protobuf/php && \
-  git reset --hard 6b27c1f981a9a93918e4039f236ead27165a8e91 && \
+  git reset --hard 8d97b3d8b5a33650e822460b3b561802c969e86e && \
   ln -sfn /usr/bin/php5.5 /usr/bin/php && \
   ln -sfn /usr/bin/php-config5.5 /usr/bin/php-config && \
   ln -sfn /usr/bin/phpize5.5 /usr/bin/phpize && \

php/src/Google/Protobuf/Internal/GPBUtil.php

@@ -252,7 +252,7 @@ class GPBUtil
             return $prefix;
         }
 
-        $reserved_words = array("Empty");
+        $reserved_words = array("Empty", "ECHO", "ARRAY");
         foreach ($reserved_words as $reserved_word) {
             if ($classname === $reserved_word) {
                 if ($file_proto->getPackage() === "google.protobuf") {