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$emails = 'abc@test.com,efg@test.com';
var_dump(checkemail($emails));
function checkemail($data){
$ret = true;
$emails = explode(',', $data);
foreach($emails as $email){
if(!(strlen($email) > 6 && preg_match("/^[\w\-\.]+@[\w\-]+(\.\w+)+$/", $email))){
$ret = false;
break;
}
}
return $ret;
}