Help mime_content_type

if(in_array(mime_content_type("$fulldir$entry"), $imagetypes)) {
$retval[] = array(
“file” => “/$dir$entry”,
“size” => getimagesize("$fulldir$entry")
this is my code
and i have problem with blocking system() from function mime_content_type
i added function manualy because i have new php without mime_content_type
I know there is a replace for mime_content_type so can someone help me ?

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