Cancel an asynchronous query

# pg_cancel_query

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

pg_cancel_query — Cancel an asynchronous query

### Description

pg_cancel_query(PgSql\Connection `$connection`): bool

pg_cancel_query() cancels an asynchronous query sent with pg_send_query(), pg_send_query_params() or pg_send_execute(). You cannot cancel a query executed using pg_query().

### Parameters

`connection`

  An PgSql\Connection instance.

### Return Values

Returns `true` on success or `false` on failure.

### Changelog

Version | Description
--- | ---
8.1.0 | The `connection` parameter expects an PgSql\Connection instance now; previously, a resource was expected.

### Examples

Example #1 pg_cancel_query() example

`<?php
$dbconn = pg_connect("dbname=publisher") or die("Could not connect");
if (!pg_connection_busy($dbconn)) {
pg_send_query($dbconn, "select * from authors; select count(*) from authors;");
}
$res1 = pg_get_result($dbconn);
echo "First call to pg_get_result(): $res1\n";
$rows1 = pg_num_rows($res1);
echo "$res1 has $rows1 records\n\n";
// Cancel the currently running query. Will be the second query if it is
// still running.
pg_cancel_query($dbconn);
?>`

The above example will output:

    First call to pg_get_result(): Resource id #3
    Resource id #3 has 3 records

### See Also

- pg_send_query() - Sends asynchronous query
- pg_connection_busy() - Get connection is busy or not

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