Deprecation: #73516 - Various GeneralUtility methods

See Issue #73516

Description

The following methods within GeneralUtility have been marked as deprecated:

GeneralUtility::flushOutputBuffers()
GeneralUtility::xmlGetHeaderAttribs()
GeneralUtility::imageMagickCommand()

The second and third parameter of GeneralUtility::getFileAbsFileName() have been removed as well.

Impact

Calling any of the methods above will trigger a deprecation log entry. Calling GeneralUtility::getFileAbsFileName() with the second and third parameter set will also trigger a deprecation log entry.

Affected Installations

Any installation using any third-party extension calling any of these methods.

Migration

For GeneralUtility::flushOutputBuffers() use ob_clean().

For GeneralUtility::imageMagickCommand() use CommandUtility::imageMagickCommand.