What is the usage of count in thinkphp

In thinkphp, the count method is a statistical query method, used to count the number of data tables or data records. The returned result is the counted number of characters. The syntax is "$model -> [where() - > ] count();".

The operating environment of this article: Windows 10 system, ThinkPHP version 5, Dell G3 computer.

What is the usage of count in thinkphp

Statistical query methods in ThinkPHP

In ThinkPHP, the system provides the use of the following query methods, which is convenient for later needs Use of statistics.

count() represents the total number of records in the query table

count method

Syntax:

$model -> [where() -> ] count();

Case: Query the department table total.

    //count方法
    public function test(){
        //实例化模型
        $model = M('Dept');
        //count方法
        $result = $model -> count();
        //打印
        dump($result);
 
    }

Display results:

The return value is in the form of characters.

Results in sql tracking information:

Information in database:

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