Bug #79764 [Com]: finfo::file returns text/plain mime type when JSON contains empty arrays

Edit report at https://bugs.php.net/bug.php?id=79764&edit=1 ID: 79764 Comment by: edi dot modric at gmail dot com Reported by: edi dot modric at gmail dot com Summary: finfo::file returns text/plain mime type when JSON contains empty arrays Status: Open Type: Bug Package: Filesystem function related Operating System: Ubuntu 20.04 PHP Version: 7.4.7 Block user comment: N Private report: N New Comment: eddie@abyss ~ $ file a.json a.json: ASCII text eddie@abyss ~ $ file b.json b.json: JSON data So it seems this might not be a PHP issue, but a system one. If so, feel free to close this and sorry for the noise. Previous Comments: ------------------------------------------------------------------------ [2020-07-01 13:31:28] cmb@php.net What does file report about that file? ------------------------------------------------------------------------ [2020-07-01 12:48:48] mamontovdmitriy at mail dot ru I confirm this issue. ------------------------------------------------------------------------ [2020-07-01 12:26:33] edi dot modric at gmail dot com Description: ------------ Using the following JSON document: { "foo": [] } finfo::file method wrongly returns text/plain as mime type instead of application/json. Modifying the JSON document to e.g.: { "foo": ["bar"] } makes the function behave correctly and returns application/json. Test script: --------------- <?php $finfo = new finfo(FILEINFO_MIME_TYPE); echo $finfo->file('file.json') . PHP_EOL; Expected result: ---------------- With the following content of file.json: { "foo": [] } I expect to see "application/json" as the output. Actual result: -------------- With the following content of file.json: { "foo": [] } "text/plain" is returned. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=79764&edit=1