mysqli_ping(3) [php man page]
MYSQLI_PING(3) 1 MYSQLI_PING(3) mysqli::ping - Pings a server connection, or tries to reconnect if the connection has gone down Object oriented style SYNOPSIS
bool mysqli::ping (void ) DESCRIPTION
Procedural style bool mysqli_ping (mysqli $link) Checks whether the connection to the server is working. If it has gone down, and global option mysqli.reconnect is enabled an automatic reconnection is attempted. This function can be used by clients that remain idle for a long while, to check whether the server has closed the connection and recon- nect if necessary. PARAMETERS
o $ link -Procedural style only: A link identifier returned by mysqli_connect(3) or mysqli_init(3) RETURN VALUES
Returns TRUE on success or FALSE on failure. EXAMPLES
Example #1 mysqli::ping example Object oriented style <?php $mysqli = new mysqli("localhost", "my_user", "my_password", "world"); /* check connection */ if ($mysqli->connect_errno) { printf("Connect failed: %s ", $mysqli->connect_error); exit(); } /* check if server is alive */ if ($mysqli->ping()) { printf ("Our connection is ok! "); } else { printf ("Error: %s ", $mysqli->error); } /* close connection */ $mysqli->close(); ?> Procedural style <?php $link = mysqli_connect("localhost", "my_user", "my_password", "world"); /* check connection */ if (mysqli_connect_errno()) { printf("Connect failed: %s ", mysqli_connect_error()); exit(); } /* check if server is alive */ if (mysqli_ping($link)) { printf ("Our connection is ok! "); } else { printf ("Error: %s ", mysqli_error($link)); } /* close connection */ mysqli_close($link); ?> The above examples will output: Our connection is ok! PHP Documentation Group MYSQLI_PING(3)
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MYSQLI_ERRNO(3) 1 MYSQLI_ERRNO(3) mysqli::$errno - Returns the error code for the most recent function call Object oriented style SYNOPSIS
int$mysqli->errno () DESCRIPTION
Procedural style int mysqli_errno (mysqli $link) Returns the last error code for the most recent MySQLi function call that can succeed or fail. Client error message numbers are listed in the MySQL errmsg.h header file, server error message numbers are listed in mysqld_error.h. In the MySQL source distribution you can find a complete list of error messages and error numbers in the file Docs/mysqld_error.txt. PARAMETERS
o $ link -Procedural style only: A link identifier returned by mysqli_connect(3) or mysqli_init(3) RETURN VALUES
An error code value for the last call, if it failed. zero means no error occurred. EXAMPLES
Example #1 $mysqli->errno example Object oriented style <?php $mysqli = new mysqli("localhost", "my_user", "my_password", "world"); /* check connection */ if ($mysqli->connect_errno) { printf("Connect failed: %s ", $mysqli->connect_error); exit(); } if (!$mysqli->query("SET a=1")) { printf("Errorcode: %d ", $mysqli->errno); } /* close connection */ $mysqli->close(); ?> Procedural style <?php $link = mysqli_connect("localhost", "my_user", "my_password", "world"); /* check connection */ if (mysqli_connect_errno()) { printf("Connect failed: %s ", mysqli_connect_error()); exit(); } if (!mysqli_query($link, "SET a=1")) { printf("Errorcode: %d ", mysqli_errno($link)); } /* close connection */ mysqli_close($link); ?> The above examples will output: Errorcode: 1193 SEE ALSO
mysqli_connect_errno(3), mysqli_connect_error(3), mysqli_error(3), mysqli_sqlstate(3). PHP Documentation Group MYSQLI_ERRNO(3)