PHP : I have ext-fileinfo but Composer says it is missing

PHP : I have ext-fileinfo but Composer says it is missing
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This is a YouTube's feature which works on Desktop.
First, Make sure this video is playing.
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The progress bar on YouTube will be altered to a flashing rainbow.

A brief presentation of myself,
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Allow me to support you in answering your questions.
PHP : I have ext-fileinfo but Composer says it is missing
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I have but PHP ext-fileinfo says it Composer missing : is