How to conditionally query in yii framework

Conditional query

$customers = Customer::find()->where($cond)->all();

$cond is what we call conditions. The way of writing conditions also depends on the query data. There are differences, so how to write query conditions using yii2?

[[Simple condition]]

// SQL: (type = 1) AND (status = 2).  
$cond = ['type' => 1, 'status' => 2]   
// SQL:(id IN (1, 2, 3)) AND (status = 2)  
$cond = ['id' => [1, 2, 3], 'status' => 2]   
//SQL:status IS NULL  
$cond = ['status' => null]

[and]: Combine different conditions together, usage example:

//SQL:`id=1 AND id=2`  
$cond = ['and', 'id=1', 'id=2']  
//SQL:`type=1 AND (id=1 OR id=2)`  
$cond = ['and', 'type=1', ['or', 'id=1', 'id=2']]  
//SQL:`type=1 AND (id=1 OR id=2)` //此写法'='可以换成其他操作符，例：in like != >=等  
$cond = [  
    'and',  
    ['=', 'type', 1],  
    [  
        'or',  
        ['=', 'id', '1'],  
        ['=', 'id', '2'],  
    ]  
]

[[or]]:

/SQL:`(type IN (7, 8, 9) OR (id IN (1, 2, 3)))`  
$cond = ['or', ['type' => [7, 8, 9]], ['id' => [1, 2, 3]]

[[not]]:

//SQL:`NOT (attribute IS NULL)`  
$cond = ['not', ['attribute' => null]]

[[between]]: not between has the same usage

//SQL:`id BETWEEN 1 AND 10`  
$cond = ['between', 'id', 1, 10]

[[in]]: not in has the same usage

//SQL:`id IN (1, 2, 3)`  
$cond = ['in', 'id', [1, 2, 3]] or $cond = ['id'=>[1, 2, 3]]

//IN条件也适用于多字段  
$cond = ['in', ['id', 'name'], [['id' => 1, 'name' => 'foo'], ['id' => 2, 'name' => 'bar']]]  
//也适用于内嵌sql语句  
$cond = ['in', 'user_id', (new Query())->select('id')->from('users')->where(['active' => 1])]

[[like]]:

//SQL:`name LIKE '%tester%'`
$cond = ['like', 'name', 'tester']
//SQL:`name LIKE '%test%' AND name LIKE '%sample%'`
$cond = ['like', 'name', ['test', 'sample']]
//SQL:`name LIKE '%tester'`
$cond = ['like', 'name', '%tester', false]

[[exists]]: not exists usage is similar to

//SQL:EXISTS (SELECT "id" FROM "users" WHERE "active"=1)
$cond = ['exists', (new Query())->select('id')->from('users')->where(['active' => 1])]

In addition, you can specify any operator as follows:

//SQL:`id >= 10`
$cond = ['>=', 'id', 10] 
//SQL:`id != 10`
$cond = ['!=', 'id', 10]

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