3v4l.org

run code in 300+ PHP versions simultaneously
<?php $docx = 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var_dump(finfo_buffer(finfo_open(FILEINFO_MIME_TYPE), base64_decode($docx)));
Output for 7.3.0, 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(71) "application/vnd.openxmlformats-officedocument.wordprocessingml.document"
Output for 7.2.34
string(24) "application/octet-stream"
Output for 5.3.29
string(15) "application/zip"
preferences:
138.45 ms | 401 KiB | 124 Q