PHP Build Path
The PHP build process scans all resources that are on the project's
PHP Build Path so that elements defined within them can be made available
for Content Assist options
Configuring the project's Build Path allows you to select PHP resources to include/exclude from this process. Rather than automatically scanning all resources within the project, configuring the Build Path allows you to select which resources will be scanned (letting you, for example, exclude folders containing images, JavaScript files or other types of files not containing PHP code). This can significantly speed up the build process.