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empty()函数的使用场景:
示例:
var_dump(empty(null));
var_dump(empty(''));
var_dump(empty([]));
var_dump(empty(false));
var_dump(![]);
var_dump(0 == '');
var_dump(0 === '');
输出:
true
true
true
true
true
true
false
mysql增删改查操作
示例:
//查,返回array()
self::find()->where(['name'=>$name])->asArray()->one();
//增,返回int,影响的行数
\Yii::$app->db->createCommand()->insert(self::tableName(), ['name' => $name, 'value' => $value])->execute();
//改,返回int,影响的函数
\Yii::$app->db->createCommand()->update(self::tableName(), ['value' => $value], ['name' => $name])->execute();
//删,返回false|int
$setting = self::findOne(['name' => $name]);
$setting->delete();