Use php-build and php-version for multiple concurrent versions of php on your dev box.

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Install php-build:

  sudo apt-get build-dep php5-cli git
	git clone git://github.com/CHH/php-build
	sudo php-build/install.sh
	
Install php-version:

	git clone https://github.com/wilmoore/php-version.git
	sudo ln -s php-version/php-version.sh /usr/local/bin/php-version
	
Look for valid versions to install:

	sudo php-build --definitions	

Build a php version:

	mkdir ~/php-installs
	sudo php-build -i development <version_number> ~/php-installs/<version_number>
	
Switch between versions:

	php-version <version_number>