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Amazon Simple Storage Service
Developer Guide (API Version 2006-03-01)

Using the AWS PHP SDK for Multipart Upload (Low-Level API)

The AWS SDK for PHP exposes a low-level API that closely resembles the Amazon S3 REST API for multipart upload (see Using the REST API for Multipart Upload ). Use the low-level API when you need to pause and resume multipart uploads, vary part sizes during the upload, or do not know the size of the data in advance. Use the AWS SDK for PHP high-level abstractions (see Using the AWS PHP SDK for Multipart Upload (High-Level API)) whenever you don't have these requirements.