小编can*_*ain的帖子

拜托,谁能告诉我这里我做错了什么？我只是从表中检索结果然后将它们添加到数组中.一切都按预期工作,直到我检查一个空的结果...

这将获得匹配,将其添加到我的数组并按预期回应结果:

$today = date('Y-m-d', strtotime('now'));

$sth = $db->prepare("SELECT id_email FROM db WHERE hardcopy = '1' AND hardcopy_date <= :today AND hardcopy_sent = '0' ORDER BY id_email ASC");

$sth->bindParam(':today',$today, PDO::PARAM_STR);

if(!$sth->execute()) {
    $db = null ;
    exit();
}

while ($row = $sth->fetch(PDO::FETCH_ASSOC)) {
    $this->id_email[] = $row['id_email'] ;
    echo $row['id_email'] ;
}

$db = null ;
return true ;

当我尝试检查空结果时,我的代码返回'empty',但不再产生匹配结果:

$today = date('Y-m-d', strtotime('now'));

$sth = $db->prepare("SELECT id_email FROM db WHERE hardcopy = '1' AND hardcopy_date <= :today AND hardcopy_sent = …