It returns the error description of the last MySQL operation

Example

<?php
$conn = mysql_connect(“localhost”, “root”, “password”) or die(mysql_error());
?>

It returns the error number of the last MySQL operation

Example

<?php
$conn = mysql_connect(“localhost”, “root”, “password”) or die(mysql_errno());
?>

Its Deprecated. .Sends a MySQL query

It  delete the databse . Its depricated

It returns database name from the call to mysql_list_dbs()

Example

<?php
$conn = mysql_connect(“localhost”, “root”, “password”) or die(mysql_error());
$db_list = mysql_list_dbs($conn);
$db_count = mysql_num_rows($db_list);
for($i=0;$i<$db_count;$i++){
echo mysql_db_name($db_list, $i) . “<br />”;
}
?>

It moves the record pointer

MySQL Table – Users

+—-+——+
| id | name |
+—-+——+
|  1 | PHP  |
|  2 | JS   |
|  3 | HTML |
|  4 | AS   |
+—-+——+

Example

<?php
$conn = mysql_connect(“localhost”, “root”, “password”) or die(mysql_error());
mysql_select_db(“database_name”,$conn);
$userInfo = mysql_query(“SELECT * from users”);
echo “<pre>”;
print_r(mysql_fetch_row($userInfo));
mysql_data_seek($userInfo,3);
print_r(mysql_fetch_row($userInfo));
mysql_close($conn);
?>

Output

Array
(
[0] => 1
[1] => PHP
)
Array
(
[0] => 4
[1] => AS
)

It creates a MySQL database

Example

<?php
$conn    = mysql_connect(‘localhost’, ‘root’, ‘passowrd’);
mysql_query(“CREATE DATABASE database_name”, $conn) or die(“Failed”);
?>

It open a connection to a MySQL Server

Example

<?php
$conn    = mysql_connect(‘localhost’, ‘root’, ‘password’);
echo  mysql_client_encoding($conn);
mysql_close($conn);
?>

It closes MySQL connection

Example

<?php
$conn    = mysql_connect(‘localhost’, ‘root’, ‘password’);
echo  mysql_client_encoding($conn);
mysql_close($conn);
?>

It  returns the name of the character set for the current connection

Example

<?php
$conn    = mysql_connect(‘localhost’, ‘root’, ‘password’);
echo  mysql_client_encoding($conn);
?>