/PHP/What should write for getting extension of image in php

What should write for getting extension of image in php

Get image extension in php

//get image extension of uploaded file in php
$imagetype = $_FILES['image']['name'];
$ext = pathinfo($imagetype, PATHINFO_EXTENSION);// get file extension

What should write for getting extension of image in php

 $image_name = $_FILES['image']['name'];
        $ext = explode('.',$image_name);

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