# CollectionModify::replace

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CollectionModify::replace — Replace document field

### Description

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

Replace (update) a given field value with a new one.

### Parameters

`collection_field`

  The document path of the item to set.

`expression_or_literal`

  The value to set on the specified attribute.

### Return Values

A CollectionModify object.

### Examples

Example #1 mysql_xdevapi\CollectionModify::replace() 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 = :name")
->bind(['name' => 'Bernie'])
->replace("name", "Bern")
->execute();
$result = $collection
->find()
->execute();
print_r($result->fetchAll());
?>`

The above example will output something similar to:

    Array
    (
        [0] => Array
            (
                [_id] => 00005b6b5361000000000000011b
                [name] => Bern
                [traits] => Array
                    (
                        [0] => Friend
                        [1] => Brother
                        [2] => Human
                    )
            )
    )