PHP : what does it mean "(include_path='.:/usr/share/pear:/usr/share/php')"?

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PHP : what does it mean "(include_path='.:/usr/share/pear:/usr/share/php')"?
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As promised, I'm going to share a hidden feature with you.
This is a YouTube's feature which works on Desktop.
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The progress bar on YouTube will be altered to a flashing rainbow.

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PHP : what does it mean "(include_path='.:/usr/share/pear:/usr/share/php')"?
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