PHP 5.3 with Zend Server 5.6 is no longer available

[Valerio]

So you need to change the "deploy" file to:

#!/usr/bin/env bash

GIT_DIR_SAVE=$GIT_DIR ; unset GIT_DIR
GIT_WORK_TREE_SAVE=$GIT_WORK_TREE ; unset GIT_WORK_TREE

if [ ! -f "${OPENSHIFT_DATA_DIR}composer/bin/composer" ]; then
export COMPOSER_HOME="${OPENSHIFT_DATA_DIR}.composer"
echo $COMPOSER_HOME > ${OPENSHIFT_HOMEDIR}.env/user_vars/COMPOSER_HOME
echo "Installing composer"
curl -s https://getcomposer.org/installer | env - PATH="/usr/bin:$PATH" php -- --install-dir=$OPENSHIFT_DATA_DIR >/dev/null
cd $OPENSHIFT_DATA_DIR
git clone --quiet git://github.com/composer/composer.git composer
cd $OPENSHIFT_DATA_DIR/composer
env - PATH="/usr/bin:$PATH" COMPOSER_HOME="$COMPOSER_HOME" php ${OPENSHIFT_DATA_DIR}composer.phar install >/dev/null
mkdir -p $OPENSHIFT_DATA_DIR/bin
ln -s $OPENSHIFT_DATA_DIR/composer/bin/composer $OPENSHIFT_DATA_DIR/bin/composer
else
echo "Updating composer"
cd ${OPENSHIFT_DATA_DIR}composer
git pull --quiet
php ${OPENSHIFT_DATA_DIR}composer/bin/composer install >/dev/null
fi

echo "Running composer install"
cd $OPENSHIFT_REPO_DIR/php
php $OPENSHIFT_DATA_DIR/bin/composer install

export GIT_DIR=$GIT_DIR_SAVE ; unset GIT_DIR_SAVE
export GIT_WORK_TREE=$GIT_WORK_TREE_SAVE ; unset GIT_WORK_TREE

chmod -R 0777 $OPENSHIFT_REPO_DIR/php/app/cache
chmod -R 0777 $OPENSHIFT_REPO_DIR/php/app/logs

[KhalO]

You can look https://gist.github.com/brunodmt/9571555 for a fresh Symfony install guide