- 2.5 MySQL Functions
- 2.5.1 mysql_affected_rows
- 2.5.2 mysql_client_encoding
- 2.5.3 mysql_close
- 2.5.4 mysql_connect
- 2.5.5 mysql_create_db
- 2.5.6 mysql_data_seek
- 2.5.7 mysql_db_name
- 2.5.8 mysql_db_query
- 2.5.9 mysql_drop_db
- 2.5.10 mysql_errno
- 2.5.11 mysql_error
- 2.5.12 mysql_escape_string
- 2.5.13 mysql_fetch_array
- 2.5.14 mysql_fetch_assoc
- 2.5.15 mysql_fetch_field
- 2.5.16 mysql_fetch_lengths
- 2.5.17 mysql_fetch_object
- 2.5.18 mysql_fetch_row
- 2.5.19 mysql_field_flags
- 2.5.20 mysql_field_len
- 2.5.21 mysql_field_name
- 2.5.22 mysql_field_seek
- 2.5.23 mysql_field_table
- 2.5.24 mysql_field_type
- 2.5.25 mysql_free_result
- 2.5.26 mysql_get_client_info
- 2.5.27 mysql_get_host_info
- 2.5.28 mysql_get_proto_info
- 2.5.29 mysql_get_server_info
- 2.5.30 mysql_info
- 2.5.31 mysql_insert_id
- 2.5.32 mysql_list_dbs
- 2.5.33 mysql_list_fields
- 2.5.34 mysql_list_processes
- 2.5.35 mysql_list_tables
- 2.5.36 mysql_num_fields
- 2.5.37 mysql_num_rows
- 2.5.38 mysql_pconnect
- 2.5.39 mysql_ping
- 2.5.40 mysql_query
- 2.5.41 mysql_real_escape_string
- 2.5.42 mysql_result
- 2.5.43 mysql_select_db
- 2.5.44 mysql_set_charset
- 2.5.45 mysql_stat
- 2.5.46 mysql_tablename
- 2.5.47 mysql_thread_id
- 2.5.48 mysql_unbuffered_query
Copyright 1997-2012 the PHP Documentation Group.
mysql_pingPing a server connection or reconnect if there is no connection
This extension is deprecated as of PHP 5.5.0, and will be removed in the future. Instead, the MySQLi or PDO_MySQL extension should be used. See also MySQL: choosing an API guide and related FAQ for more information. Alternatives to this function include:
mysqli_ping
|
Description
bool mysql_ping(resource link_identifier= =NULL);Checks whether or not the connection to the server is working. If it has gone down, an automatic reconnection is attempted. This function can be used by scripts that remain idle for a long while, to check whether or not the server has closed the connection and reconnect if necessary.
Automatic reconnection is disabled by default in versions of MySQL >= 5.0.3.
Parameters
-
link_identifier The MySQL connection. If the link identifier is not specified, the last link opened by
mysql_connectis assumed. If no such link is found, it will try to create one as ifmysql_connectwas called with no arguments. If no connection is found or established, anE_WARNINGlevel error is generated.
Return Values
Returns
TRUE
if the connection to the server MySQL server is working,
otherwise
FALSE
.
Examples
Example 2.45. A
mysql_ping
example
<?php
set_time_limit(0);
$conn = mysql_connect('localhost', 'mysqluser', 'mypass');
$db = mysql_select_db('mydb');
/* Assuming this query will take a long time */
$result = mysql_query($sql);
if (!$result) {
echo 'Query #1 failed, exiting.';
exit;
}
/* Make sure the connection is still alive, if not, try to reconnect */
if (!mysql_ping($conn)) {
echo 'Lost connection, exiting after query #1';
exit;
}
mysql_free_result($result);
/* So the connection is still alive, let's run another query */
$result2 = mysql_query($sql2);
?>
See Also
mysql_thread_id
|
mysql_list_processes
|
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