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How to pass a Javascript Array to PHP file using AJAX and JSON? I have an array in javascript and I need to pass this array to a PHP by using AJAX call to that PHP file. I will get this array in PHP file and assign this javascript array to PHP array. Then I will find out the count of that PHP array elements and return it back to the javascript. I will convert JS array in JSON format by JSON.stringify. This is a very simple example on how to pass javascript array to PHP asynchronously. You can perform a lot of operations on this array which you have passed to PHP file but for simplicity I am just returning its count. Let's have a look at the following code snippet. Javascript Array var myJSArray = new Array("Saab","Volvo","BMW"); ProcessAJAXRequest() function wil pass JS array to PHP file using AJAX request and will show count of array elements returned by PHP file. function ProcessAJAXRequest() {     $.ajax     ({         type: "POST",   ...

PHP Basic Interview Questions and Answers for Web Developers - Part 1 In this article on PHP Interview Questions, I have compiled a list of very basic and fundamental PHP interview questions and answers for web developers. Every PHP web developer should know these basic questions of PHP. So, if you are preparing for any interview in PHP development, you should go through the following list of PHP basic interview questions. There PHP questions are based on very simple PHP concepts like basic introduction to PHP, Sessions and Cookies in PHP, Input / Output in PHP, Error Management in PHP, MySQL database connectivity in PHP, SQL Injection in PHP, Encryption and Decryption in PHP, Sending Emails in PHP, datatypes in PHP and many more. Lets have a look... 1. What is PHP? PHP is a server side scripting object oriented language commonly used for web applications.  2. What is the use of "echo" in php? It is used to print a data in the webpage. Example:  <?php echo 'Hi'; ?...

How to secure jQuery AJAX calls in PHP from hackers? If you are making jQuery AJAX calls in your PHP website, please ensure that those jQuery AJAX calls are secure from website hackers. Your code should not be vulnerable to hackers. Below are some methods and steps which need to be taken to secure your jQuery AJAX calls to PHP files. I am writing this post because I had written a simple post " How to call PHP function from JavaScript function? Always use AJAX. " without mentioning any security code. I got following comment on that post: " Your code is very vulnerable. You're not filtering the $_POST variable at all. This opens yourself to HTML injection. A hacker could pwn your web site very quickly if you used this code. Careless examples like yours is exactly why so many web sites are hacked. " That's why this is my small attempt to make your jQuery AJAX calls secure.  1. Use $_SERVER['HTTP_X_REQUESTED_WITH'] :  This is a basic check to see if the ...

How to call PHP function from JavaScript function? Always use AJAX. Recently, I was developing a web application in PHP. I get into the need of calling my PHP function from my Javascript function. This is the common thing when you are developing a web application in PHP and have to call a PHP code from Javascript to refresh only a certain portion of your web page with server results. Always use AJAX to achieve this functionality. Using AJAX you can call server side code / functions (your PHP code) from client side (Javascript). Below is the PHP and Javascript code snippet to illustrate this concept.  This is very simple example on how to call server side functions of PHP from client browsers (Javascript)? In following example, I have a PHP file named myscript.php which has function named myfunction(). This function uses two $_POST variables and just echoes them. I have mydiv HTML div anywhere on my webpage which I want to refresh with the result which is returned from my PHP script...

How to use setInterval and clearInterval jQuery methods in PHP? I will explain usage of setInterval and clearInterval jQuery methods with the help of simple example in PHP. Suppose there is a PHP array in which there are 3 elements. I want to display all of them one by one at regular intervals and stop when all the three array elements have been displayed. I will use setInterval and clearInterval jQuery methods here to implement it. Here is my index.php file <html> <head> <script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script> <script type="text/javascript"> var count = 0; $(document).ready(function(){ var auto_refresh = setInterval(function (){     $('#mydiv').load('myphpfile.php', {count: count}, function () {         count = count + 1;         //after three attempts it won't call php file.         if (count > 2) {           ...

How to generate Random Numbers at Regular Intervals in PHP?  Following is the simple PHP tutorial to demonstrate how to generate random numbers at regular intervals in PHP? I will use jquery setInterval() method for calling PHP file (which generates random numbers) at regular intervals say after every second in my example. I will use PHP rand() function to generate random numbers in PHP. I am using google CDN for jquery libraray. So here is the simple example in PHP to generate random numbers at regular intervals. index.php file <!DOCTYPE html> <html lang="en"> <head> <script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script> <script type="text/javascript"> $(document).ready(function(){ var auto_refresh_random_numbers = setInterval( function () { $('#load_random_numbers').load('generate_random_numbers.php').fadeIn("slow"); }, 1000); // refresh random numbers after ever...