[Sync EN] Fix non-runnable code examples (undefined variables, syntax errors) (#5588)

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Commit: https://github.com/php/doc-en/commit/8e2cfbdce0cd028a6521c6e073f148e0f7efac7c
PR: https://github.com/php/doc-en/pull/5588

Zu aktualisierende DE-Dateien

• appendices/migration74/new-features.xml

Neue EN-Dateien (noch nicht übersetzt)

• reference/ev/evperiodic/construct.xml
• reference/imagick/imagick/mergeimagelayers.xml
• reference/mongodb/mongodb/driver/bulkwritecommand/replaceone.xml
• reference/rar/rarentry/getunpackedsize.xml
• reference/solr/solrdismaxquery/setqueryalt.xml
• reference/spl/splfileinfo/getgroup.xml
• reference/spl/splfileinfo/getowner.xml
• reference/spl/splfileinfo/getsize.xml
• reference/uri/uri/rfc3986/uri/parse.xml
• reference/uri/uri/whatwg/url/parse.xml
• reference/xattr/functions/xattr-list.xml
• reference/xlswriter/xlsx-kernel/auto-filter.xml
• reference/xlswriter/xlsx-kernel/const-memory.xml
• reference/xlswriter/xlsx-kernel/file-name.xml
• reference/xlswriter/xlsx-kernel/insert-text.xml
• reference/yac/yac/add.xml
• reference/yaf/yaf_route_rewrite/assemble.xml