we will create a simple widget,See this code and then paste it in your site-specific plugin or functions.php file to see it in 
action.  

// Creating the widget 
class wpb_widget extends WP_Widget {

function __construct() {
parent::__construct(
// Base ID of your widget
'wpb_widget', 

// Widget name will appear in UI
__('WPBeginner Widget', 'wpb_widget_domain'), 

// Widget description
array( 'description' => __( 'Sample widget based on WPBeginner Tutorial', 'wpb_widget_domain' ), ) 
);
}

// Creating widget front-end
// This is where the action happens
public function widget( $args, $instance ) {
$title = apply_filters( 'widget_title', $instance['title'] );
// before and after widget arguments are defined by themes
echo $args['before_widget'];
if ( ! empty( $title ) )
echo $args['before_title'] . $title . $args['after_title'];

// This is where you run the code and display the output
echo __( 'Hello, World!', 'wpb_widget_domain' );
echo $args['after_widget'];
}
  
// Widget Backend 
public function form( $instance ) {
if ( isset( $instance[ 'title' ] ) ) {
$title = $instance[ 'title' ];
}
else {
$title = __( 'New title', 'wpb_widget_domain' );
}
// Widget admin form
?>
<p>
<label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e( 'Title:' ); ?></label> 
<input class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" type="text" value="<?php echo esc_attr( $title ); ?>" />
</p>
<?php 
}
 
// Updating widget replacing old instances with new
public function update( $new_instance, $old_instance ) {
$instance = array();
$instance['title'] = ( ! empty( $new_instance['title'] ) ) ? strip_tags( $new_instance['title'] ) : '';
return $instance;
}
} // Class wpb_widget ends here

// Register and load the widget
function wpb_load_widget() {
 register_widget( 'wpb_widget' );
}
add_action( 'widgets_init', 'wpb_load_widget' );

With the last version of PHP, there are many actual methods included in the core language that you should use in your code files. These will help you a lot that you might have working out the easist way to creat a salt. So, if you are able to do, I suggest you to switch to using this method everywhere (if possible) you generate passwords.

Hashing Logic is as simple as you doing this:

password_hash('YouRSuperSecure&(*$p880$0w0rd!', PASSWORD_BCRYPT);

Example:- 

password_hash('YouRSuperSecure&(*$p880$0w0rd!', PASSWORD_BCRYPT, ['cost' => 16]);

How to Insert data into table from excel file in php

Step 1:- Open an excel file and save as "Excel Data" text file and in below sample code, "test.txt" is excel-data excel file.

Step 2:- Now, follow the below instruction for create code for insert data into table in mysql using php.


<?php
  include 'config.php';
// Connect to your database.

$fp = fopen("test.txt", "r");    // Open that file('Excel Data') for reading

while($line = fgets($fp))      // Loop through each line
{

     list ($name, $first) = explode("\t", $line);

     // Split the line by the Excel Data and store it in our list...

     $sql = "insert into user (name,phone) values ('$name', '$first')";

     // Generate sql string...

     mysql_query($sql) or die ( mysql_error() );        // Execute the sql

}

?>
Step 3:- Run file.