php mysql_close function
Returns TRUE on success or FALSE on failure.
<?php
$link_to_database = mysql_connect(‘localhost’, ‘username’, ‘password’); //
if (!$link_to_database) { // checking connection
die(‘Could not connect: ‘ . mysql_error());
}
echo ‘Connected successfully’; // Display Message when connection is sucessfully done
mysql_close($link); // This function will close the mysql connection
?>
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php mysql_client_encoding function
mysql_client_encoding Return : Returns the default character set name for the current connection.
<?php
$database_link = mysql_connect(‘localhost’, ‘username’, ‘password’);
$what_is_charset = mysql_client_encoding($database_link);
echo “Your current character set is: $what_is_charset\n”;
// Output : Your current character set is: latin1
?>
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php mysql_change_user function
<?php
$old_user = ‘username’;
$new_user = ‘newusername’;
$link = mysql_connect (‘hostname’,$old_user,’password’);
if (mysql_change_user ($old_user, $new_user)) {
echo “User changed to <b>$new_user</b>.”;
} else {
echo “User could not be changed to <b>$new_user</b>.”;
}
?>
php mysql_affected_rows function
mysql_affected_rows Get the number of affected rows by the last INSERT, UPDATE, REPLACE or DELETE query.
<?php
$link = mysql_connect(‘localhost’, ‘username’, ‘password’);
if (!$link) {
die(‘Could not connect: ‘ . mysql_error());
}
mysql_select_db(‘mydb’);
// This will return the number of records deleted
mysql_query(‘DELETE FROM table WHERE fldid < 100′);
print “Records Deleted By Above Query: “. mysql_affected_rows();
// Output will be like this : Records Deleted By Above Query: 10
?>
php strripos function
<?php
$haystack = ‘ababcd’;
$needle = ‘aB’;
$pos = strripos($haystack, $needle);
if ($pos === false) {
echo “Sorry, we did not find ($needle) in ($haystack)”;
} else {
echo “Congratulations!\n”;
echo “We found the last ($needle) in ($haystack) at position ($pos)”;
}
?>
php mysql_errno function
Returns the error number from the last MySQL function, or 0 (zero) if no error occurred.
<?php
$link = mysql_connect(”localhost”, “mysql_username”, “mysql_password”);
mysql_select_db(”nonexistentdb”, $link);
echo mysql_error($link);
// output of this echo will be: 1049
// error no 1049 is for database not exist
?>
php mysql_error function
<?php
$link = mysql_connect(“localhost”, “mysql_username”, “mysql_password”);
mysql_select_db(“nonexistentdb”, $link);
echo mysql_error($link);
// output of this echo will be: Unknown database ‘nonexistentdb’
mysql_select_db(“existentdb”, $link);
mysql_query(“SELECT * FROM nonexistenttable”, $link);
echo mysql_error($link);
// output of this echo will be: Table ‘existentdb.nonexistenttable’ doesn’t exist
?>
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