mysqli_error(3) [php man page]

MYSQLI_ERROR(3) 							 1							   MYSQLI_ERROR(3)

mysqli::$error - Returns a string description of the last error

       Object oriented style

SYNOPSIS

       string$mysqli->error ()

DESCRIPTION

       Procedural style
       string mysqli_error (mysqli  $link)

	Returns the last error message for the most recent MySQLi function call that can succeed or fail.

PARAMETERS

	      o $
		link -Procedural style only: A link identifier returned by mysqli_connect(3) or mysqli_init(3)

RETURN VALUES

	A string that describes the error. An empty string if no error occurred.

EXAMPLES

       Example #1

	      $mysqli->error 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("Errormessage: %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();
	      }

	      if (!mysqli_query($link, "SET a=1")) {
		  printf("Errormessage: %s
", mysqli_error($link));
	      }

	      /* close connection */
	      mysqli_close($link);
	      ?>

	      The above examples will output:

	      Errormessage: Unknown system variable 'a'

SEE ALSO

       mysqli_connect_errno(3), mysqli_connect_error(3), mysqli_errno(3), mysqli_sqlstate(3).

PHP Documentation Group 													   MYSQLI_ERROR(3)

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)