Command Line Tool Support: Composer
The dialog opens when you click and choose Composer in the Command Line Tools dialog. Use the dialog to configure Composer support in PhpStorm.
In this dialog, enable the use of Composer Dependency Manager in the command line mode by specifying the way to launch Composer and appointing the file to look for Composer commands in.
PhpStorm parses the contents of the specified .phar archive or executable file for Composer commands. When the file analysis is completed, PhpStorm returns to the Command Line Tools Support page where the specified file is added to the list of command line tools available in PhpStorm.
Composer.phar or PHP script
Choose this option to launch Composer through a PHP script or have PhpStorm detect and start the launcher in the composer.phar archive. In this mode, PhpStorm provides coding assistance and allows you to execute scripts.
Choose this option to launch Composer through the composer executable file. In this mode, you do not get coding assistance and cannot execute scripts because no PHP engine is appointed for it.
In the Path to executable field, specify the location of the composer executable file.