# CollectionFind::sort

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CollectionFind::sort — Set the sorting criteria

### 说明

public mysql_xdevapi\CollectionFind::sort(string `$sort_expr`): mysql_xdevapi\CollectionFind

Sort the result set by the field selected in the sort_expr argument. The allowed orders are ASC (Ascending) or DESC (Descending). This operation is equivalent to the 'ORDER BY' SQL operation and it follows the same set of rules.

### 参数

`sort_expr`

  One or more sorting expressions can be provided. The evaluation is from left to right, and each expression is separated by a comma.

### 返回值

A CollectionFind object that can be used to execute the command, or to add additional operations.

### 示例

示例 #1 mysql_xdevapi\CollectionFind::sort() example

`<?php
$session = mysql_xdevapi\getSession("mysqlx://user:password@localhost");
$session->sql("DROP DATABASE IF EXISTS addressbook")->execute();
$session->sql("CREATE DATABASE addressbook")->execute();
$schema = $session->getSchema("addressbook");
$create = $schema->createCollection("people");
$create
->add('{"name": "Alfred", "age": 18, "job": "Butler"}')
->execute();
$create
->add('{"name": "Reginald", "age": 42, "job": "Butler"}')
->execute();
// ...
$collection = $schema->getCollection("people");
$result = $collection
->find()
->sort('job desc', 'age asc')
->execute();
var_dump($result->fetchAll());
?>`

以上示例的输出类似于：

    array(2) {
      [0]=>
      array(4) {
        ["_id"]=>
        string(28) "00005b6b53610000000000000106"
        ["age"]=>
        int(18)
        ["job"]=>
        string(6) "Butler"
        ["name"]=>
        string(6) "Alfred"
      }
      [1]=>
      array(4) {
        ["_id"]=>
        string(28) "00005b6b53610000000000000107"
        ["age"]=>
        int(42)
        ["job"]=>
        string(6) "Butler"
        ["name"]=>
        string(8) "Reginald"
      }
    }

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