PHP | What are default session times in PHP? By default, session variables last until the user closes the browser or leaves the site otherwise most of the server terminates the session variable if you …

PHP | How to convert a string to an array? string to array There is a function in PHP called explode() which is used to convert any string to an array.    <?php $str = …

PHP | What is difference between == and === operator? "==" and "===" The two operators are known as comparison operators. "==" (i.e. equal)  and === (i.e. identical) both are use to check values are …

Mysql | Trigger The trigger can be defined as a database object just like a stored procedure. It is a set of actions that fires automatically when an event occurs in a database.   Triggers …

PHP | The maximum size of a file that can be uploaded using PHP The default maximum size of a file that can be uploaded using PHP is 2MB. upload_max_filesize = 2M; and we can …

MySQL | What is the best collation to use for MySQL? Mostly we use: utf8_general_ci utf8_unicode_ci utf8_general_ci is used for fast sorting but it is less accurate whereas utf8_unicode_ci is used for better accuracy but …

PHP |  date() function By using the PHP date() function we can find the current date and time. <?php echo date(“d-m-Y”); //This will print today date. echo date (“d-m-Y h:i:s”) // This will print today’s date …

PHP | Length of a string There is a string function called strlen() which is used to find the length of a string. It accepts a string that returns the length of the given string.  …

PHP | Find the number of rows in a result set Bellow code is use for the same $sql = "SELECT * FROM table1"; $result = mysql_query($sql, $db_link); $num_rows = mysql_num_rows($result); echo $num_rows;  

Enable errors in PHP There are two ways to enable error reporting in your PHP scripts: 1. You can add the following function in the the script: error_reporting(E_ALL); 2. You can add the following option in …

Accessing CodeIgniter Super Object from External PHP Script (Outside CodeIgniter) Sometimes, you may need to access CodeIgniter's core features — such as models, libraries, or configuration — from a standalone PHP script that’s not within …

PHP | Array error fix | array_merge() The output will be as follows: array(2) { [0]=> int(1) [1]=> int(2) } NULL NULL It will also generate two warning messages as follows: Warning: array_merge(): Argument #2 …

PHP | require() and require_once() Both require() and require_once() is use to include a file but the difference is required_once() function checks if the file already included or not where  require() function does not check. …

PHP | Statement $x = 3 + "15%" + "$25"? The correct answer is 18. Here’s why: PHP is a  loosely typed language, therefore it does automatic type conversion based on the context in which …

PHP | What are data types in PHP? Variables can store data of different types, and different data types can do different things. PHP supports the following data types: String Integer Float (floating-point numbers - …