mysqli_get_proto_info(3) [php man page]

MYSQLI_GET_PROTO_INFO(3)						 1						  MYSQLI_GET_PROTO_INFO(3)

mysqli::$protocol_version - Returns the version of the MySQL protocol used

       Object oriented style

SYNOPSIS

       string$mysqli->protocol_version ()

DESCRIPTION

       Procedural style
       int mysqli_get_proto_info (mysqli  $link)

	Returns an integer representing the MySQL protocol version used by the connection represented by the $link parameter.

PARAMETERS

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

RETURN VALUES

	Returns an integer representing the protocol version.

EXAMPLES

       Example #1

	      $mysqli->protocol_version example

	      Object oriented style

	      <?php
	      $mysqli = new mysqli("localhost", "my_user", "my_password");

	      /* check connection */
	      if (mysqli_connect_errno()) {
		  printf("Connect failed: %s
", mysqli_connect_error());
		  exit();
	      }

	      /* print protocol version */
	      printf("Protocol version: %d
", $mysqli->protocol_version);

	      /* close connection */
	      $mysqli->close();
	      ?>

	      Procedural style

	      <?php
	      $link = mysqli_connect("localhost", "my_user", "my_password");

	      /* check connection */
	      if (mysqli_connect_errno()) {
		  printf("Connect failed: %s
", mysqli_connect_error());
		  exit();
	      }

	      /* print protocol version */
	      printf("Protocol version: %d
", mysqli_get_proto_info($link));

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

	      The above examples will output:

	      Protocol version: 10

SEE ALSO

       mysqli_get_host_info(3).

PHP Documentation Group 												  MYSQLI_GET_PROTO_INFO(3)

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)