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<?php $filenames = array('path/file.jpg','path/file.png','path/file.pdf'); foreach ($filenames as $filename) { if (preg_match('/^(?!.*\.pdf).*$/', $filename)) echo "\"$filename\" is not a PDF file.\n"; }
Output for 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
"path/file.jpg" is not a PDF file. "path/file.png" is not a PDF file.

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120.54 ms | 408 KiB | 5 Q