When to use PHP interfaces?

I've been working in various companies and I've seen different reasons for using PHP interfaces. I would like to hear your opinion, what do you think in which cases should we use PHP interfaces, the reason behind using interface?

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The post WPBeginner Turns 15 Years Old – Reflections, Updates, and a Giveaway ($50,000 in Prizes) first appeared on WPBeginner.
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