I always found that logging cron job execution to a file is very helpful. Otherwise you have no idea if it’s working right. Just have your code open a file, write a timestamp, and close.
Something simple like:
$logfile = $_SERVER['DOCUMENT_ROOT'].'/CRON.txt';
$handle = fopen($logfile , 'a') or die('Cannot open file: '.$logfile );
$data="cron task called at ".date('D, d M Y H:i:s',time())."\n";
fwrite($handle, $data);
fclose($handle);
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