PHP 5.3.3 fix for DirectoryIterator::getExtension

[ryanrath]

• DirectorIterator::getExtension did not exist until PHP 5.3.6

Description

The DirectoryIterator::getExtension method was not added until 5.3.6, this causes an issue when used on CentOS6 systems that install 5.3.3 by default.

Motivation and Context

The code does not execute on CentOS6 & PHP 5.3.3. This modification should resolve that

Tests performed

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project as found in the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.