Drop collection index

# Collection::dropIndex

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Collection::dropIndex — Drop collection index

### 説明

public mysql_xdevapi\Collection::dropIndex ( string `$index_name` ) : bool

Drop a collection index.

This operation does not yield an error if the index does not exist, but `FALSE` is returned in that case.

### パラメータ

`index_name`

  Name of collection index to drop.

### 返り値

`TRUE` if the DROP INDEX operation succeeded, otherwise `FALSE`.

### 例

例1 mysql_xdevapi\Collection::dropIndex() 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");
// ...
$collection = $schema->getCollection("people");
$collection->createIndex(
'myindex',
'{"fields": [{"field": "$.name", "type": "TEXT(25)", "required": true}], "unique": false}'
);
// ...
if ($collection->dropIndex('myindex')) {
echo 'An index named 'myindex' was found, and dropped.';
}
?>`

上の例の出力は以下となります。

    An index named 'myindex' was found, and dropped.