$tmparr = ['cover'=>'http://img.kevinfei.com.cn'];
$rep = isset($tmparr['cover']) && !empty($tmparr['cover']) ? $tmparr['cover'] : '';
$result = isset($tmparr['cover']) && !empty($tmparr['cover']) ?? '';
// string(24) "http://img.kevinfei.com.cn"
从上面的结果可以看出,在php7中 ?? 代表isset ?: 代表empty
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