Append element to an array field

# CollectionModify::arrayAppend

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CollectionModify::arrayAppend — Append element to an array field

### 説明

public mysql_xdevapi\CollectionModify::arrayAppend ( string `$collection_field` , string `$expression_or_literal` ) : mysql_xdevapi\CollectionModify

Add an element to a document's field, as multiple elements of a field are represented as an array. Unlike arrayInsert(), arrayAppend() always appends the new element at the end of the array, whereas arrayInsert() can define the location.

### パラメータ

`collection_field`

  The identifier of the field where the new element is inserted.

`expression_or_literal`

  The new element to insert at the end of the document field array.

### 返り値

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

### 例

例1 mysql_xdevapi\CollectionModify::arrayAppend() 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");
$collection = $schema->createCollection("people");
$result = $collection
->add(
'{"name": "Bernie",
"traits": ["Friend", "Brother", "Human"]}')
->execute();
$collection
->modify("name in ('Bernie', 'Jane')")
->arrayAppend('traits', 'Happy')
->execute();
$result = $collection
->find()
->execute();
print_r($result->fetchAll());
?>`

上の例の出力は、 たとえば以下のようになります。

    Array
    (
        [0] => Array
            (
                [_id] => 00005b6b5361000000000000010c
                [name] => Bernie
                [traits] => Array
                    (
                        [0] => Friend
                        [1] => Brother
                        [2] => Human
                        [3] => Happy
                    )
            )
    )