sudo rm -rf /tmp/mongo-php-driver /usr/src/mongo-php-driver
git clone -c advice.detachedHead=false -b '1.6.1' --single-branch https://github.com/mongodb/mongo-php-driver.git /tmp/mongo-php-driver
sudo mv /tmp/mongo-php-driver /usr/src/mongo-php-driver
cd /usr/src/mongo-php-driver
git submodule update --init
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