How to hide admin bar in wordpress frontend.

If you would rather remove the toolbar with code, just drop the following snippet into your functions.php file:

add_filter('show_admin_bar', '__return_false');

What is Practice in technical language.

When I'm saying "Practice", what does it mean? I would say:

    Practice is a habit.

    Practice is a routine.

    Practice does not need to remember.

    Practice comes by practicing.

    Practice needs dedication and commitment.

How to page reload in ajax and jquery in php

How to page reload in ajax and jquery in php

<div id="manjeet"></div>

<script type='text/javascript'>

 function autoRefresh_div()

 {

      $('#manjeet').load('get_data.php');// a function which will load data from other file after x seconds

  }

  setInterval('autoRefresh_div()', 5000);

</script>

How to browser close and tab close event in JavaScript

Following javascript code you could use to detect browser close and tab close event.

window.onbeforeunload = function () {
    alert("Do you really want to close?");
};

How to check internet connection using javascript

Here is the simple javascript function for getting internet status working or not..

<script>
function checkInternetCon() {
var status = navigator.onLine;
if (status) {
alert("Yes!! Working");
} else {
alert("Sad!! Not Working ");
}
}</script>

Call above function on button onclick event.

<button onclick="checkInternetCon()">Check Internet Connection</button>

You can also use setInterval method in javascript

setInterval(function(){ 
var status = navigator.onLine;
 if (status) {
 console.log('Working..');
 } else {
  console.log('Not Working..');
 }
}, 5000); 

How to crop image in php.

 Learn more about php GD Library http://php.net/manual/en/book.image.php

 create index.php file.

<?php
# Note: Install GD libraries 
$filename = 'image.jpg'; //orignal file 
$newFilename = 'newImage.png'; // New file after modification 
 
list($current_width, $current_height) = getimagesize($filename);
$left = 0; //crop left margin
$top = 0;//crop right margin
$cropWidth = 1056; 
$cropHeight = 400;
$canvas = imagecreatetruecolor($cropWidth, $cropHeight);
$currentImage = imagecreatefromjpeg($filename);
imagecopy($canvas, $currentImage, 0, 0, $left, $top, $currentWidth, $currentHeight);
imagejpeg($canvas, $newFilename, 100);
?>

Create pagination using corephp and phpmysql.

First of all create your Mysql database and table

CREATE TABLE IF NOT EXISTS `posts` (
  `id` INT(11) NOT NULL AUTO_INCREMENT,
  `title` VARCHAR(200) NOT NULL,
  `description` text NOT NULL,
  `created` datetime NOT NULL,
  `updated` datetime NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB  DEFAULT CHARSET=latin1;

 create show.php file.

<?php
$hostname = 'localhost'; // your mysql hostname
$username = 'root';   // Your mysql db username
$password = 'root';   // You mysql db password
$database = 'demo';       // mysql db name
$con = mysqli_connect($hostname, $username, $password, $database);
 
    if (isset($_GET["page"])) { 
      $page  = $_GET["page"]; 
    } else { 
      $page=1; 
    };
$recordsPerPage=20; 
$start = ($page-1) * $recordsPerPage; 
$query = "SELECT * FROM posts LIMIT $start, $recordsPerPage"; 
$result = mysqli_query($con, $query);
 
echo "<table><tr><th>Title</th><th>Description</th></tr>";
while ($row = mysqli_fetch_assoc($result)) { 
            echo "<tr>
            <td>".$row['title']."</td><td>".$row['description']."</td></tr>";            
}
echo "</table>";
 
$query = "SELECT * FROM posts"; 
$result = mysqli_query($con, $query); //run the query
$totalRecords = mysqli_num_rows($result);  //count number of records
$totalPages = ceil($totalRecords / $recordsPerPage); 
 
echo "<a href='show.php?page=1'>".'|<'."</a> "; // Go to 1st page  
 
for ($num=1; $num<=$totalPages; $num++) { 
            echo "<a href='show.php?page=".$num."'>".$num."</a> "; 
}; 
echo "<a href='show.php?page=$totalPages'>".'>|'."</a> "; // Go to last page
?> 

GET HTML (Parser) Using PHP

Download html parser class file from http://sourceforge.net/projects/simplehtmldom/files/

And create your project directory and create file index.php

 index.php 

<?php
error_reporting(0);
// call parser library
include('lib/simple_html_dom.php');
$html = file_get_html('http://webdeskers.com');
$posts = array();
foreach($html->find('tr') as $e)
{
  $data = array();
  foreach($e->find('td') as $d)
  {
   $data[] =  $d->innertext;
  }
  array_push($posts, $data);
}
 
echo "<pre>";
print_r($posts);
?>

How to ADD Date Format Validation in PHP

How to ADD Date Format Validation in PHP

Using Regex

function validateDate($data) {
if (preg_match("/^[0-9]{4}-(0[1-9]|1[0-2])-(0[1-9]

|[1-2][0-9]|3[0-1])$/",$date))
    {
        return true;
    }else{
        return false;
    }
}
 
var_dump(validateDate("2017-02-27")) // true
var_dump(validateDate("27-02-2017")) // false
var_dump(validateDate("2017-14-27")) // false

Using PHP Date object

 function validateDate($date)
{
    $dt = DateTime::createFromFormat('Y-m-d', $date);
    return $dt && $dt->format('Y-m-d') === $date;
}
var_dump(validateDate("2017-02-27")) // true
var_dump(validateDate("27-02-2017")) // false
var_dump(validateDate("2017-14-27")) // false

How to display address on google map using Google Maps Embed API in php

How to display address on google map using Google Maps Embed API in php

<?php
$address = "Okhala phase 2 new delhi";
$address = str_replace(" ","+", $address);
?>
<iframe
  width="100%"
  height="400"
  frameborder="0" style="border:0"
  src="https://www.google.com/maps/embed/v1/place?key=YOUR_API_KEY
    &q=<?= $address ?>">
</iframe>