How to check if certain group of files of similar format exist in PHP? -

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i wonder there possible ways check if group of files exit format as: $filename=$anything_id."_".random.".jpg"; random can any. have lots of files like

gb_23232.jpg, gb_23122.jpg, gb_23332.jpg, gb_23422.jpg, gb_23732.jpg, gb_23922.jpg , on.

i want delete files starts gb_

you can use these code

$mask = 'gb_*.*'; array_map('unlink', glob($mask));

another code 

foreach (glob("gb_*.*") $filename) {     unlink($filename); }

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