Source code migration to 5.4 features

PHP developers announced end of life of PHP 5.3. Since now the minimal supported version is 5.4. We should plan migration to PHP 5.4.

Migration guide from PHP 5.3.x to PHP 5.4.x could be found here.

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[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.
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[Progi1984]

PHPWord is not anymore compatible PHP 5.4.