The dialog box opens when you choose Composer Project from the Project Type drop down list.
Use the dialog box to have PhpStorm create a project with Composer-specific
structure. To do this, appoint the Composer instance to use
and install the package you need in the project.
In this area, appoint the composer.phar command definition
file to use in project creation.
Use existing composer.phar: choose this option to use
commands from a previously downloaded composer.phar
and specify it location in the text box.
Download composer.phar from getcomposer.org: choose this
option to have a new instance of Composer downloaded.
The composer.phar file will be saved under the project
specified in the Create New Project dialog.
In this area, specify the package to install during the project creation.
in the list.
Available packages: from this list box, select the package
Use the search field, if necessary: start typing the search string, as you type, the
list dynamically reduces to show the packages that match the entered pattern.
Description: this read-only text box briefly explains the
functionality of the selected package.
Version to install: from this drop-down list, select the
package version. The contents of the list depend on the specific package.