• Make sure that you have LTP installed, for Ubuntu:
  • sudo apt-get install ltp
  • sudo apt-get install lcov

• Checkout or download PHP53 into directory of your choice (in my case /home/zoe/BUILDS/php53_dev)
• cd /home/zoe/BUILDS/php53_dev
• ./buildconf
• ./configure --enable-gcov
• make

• make a new directory somewhere (eg /home/zoe/TESTS/coverage) and cd to it
• create a script (run_coverage) file to run the tests, eg

export TEST_PHP_EXECUTABLE=/home/zoe/BUILDS/php53_dev/sapi/cli/php
$TEST_PHP_EXECUTABLE /home/zoe/BUILDS/php53_dev/run-tests.php /home/zoe/BUILDS/php53_dev/ext/dom

• ./run_coverage. This runs all the tests found under php53_dev/ext/dom
• lcov --directory /home/zoe/BUILDS/php53_dev/ext/dom -c -o dom.info
• genhtml dom.info -o dom_coverage. This will make a directory called dom_coverage with html coverage files in it.
• View the coverage files