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A:
You may try with PHP's fileinfo function:
$exts = array('jpg','png','jpeg','gif','pdf');
$finfo = finfo_open(FILEINFO_MIME_TYPE);
$mimetype = array();
foreach($exts as $ext) {
    $mime = finfo_file($finfo, $ext);
    $mimetype[] = $mime;
}
print_r($mimetype);
Q:
Subsetting on'siblings' in data.table
I have a data.table that contains measurements from 9 different sensors at one location at different times.
The measurements are ordered by sensor_id and time. I'm trying to subset a subset of the dataset that contains the measurements taken at the same time from all the sensors. 
I've tried using grep and includes, but these won't work on the same column with different data types (numeric and factor). I know that I could extract the relevant columns and use the subset() method with the keys, but is there a way to do this while at the same time subsetting by the entire row?
library(data.table)
DT
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