PHP Interview Questions

CRYPT() and MD5() In PHP, there are several encryption functions available for various purposes. Here are some commonly used encryption functions in PHP: md5(): This function calculates the MD5 hash of a string. However, MD5 is considered insecure for cryptographic purposes due to its vulnerability to collision attacks. Example: phpCopy code $hash = md5(‘password’); sha1(): … Read more

The exit() function is used to stop the execution of PHP script. In PHP, you can stop the execution of a script using the exit() or die() functions. Both functions immediately terminate the script’s execution and can be used with or without a message. Here’s how you can use them: phpCopy code // Using exit() … Read more

There are 3 types of error in PHP. Notices:These are non-critical errors. These errors are not displayed to the users. Warnings:These are more serious errors, but they do not result in script termination. By default, these errors are displayed to the user. Fatal Errors:These are the most critical errors. These errors may cause due to … Read more

By default, the maximum execution time for PHP scripts is set to 30 seconds. If a script takes more than 30 seconds, PHP stops the script and returns an error. You can change the script run time by changing the max_execution_time directive in the php.ini file. When a script is called, set_time_limit function restarts the … Read more

Since PHP 4.3, mysql_reate_db() is deprecated. Now you can use the following 2 alternatives. mysqli_query() PDO::_query() To create a database connection and execute a query in PHP, you typically use the MySQLi (MySQL Improved) or PDO (PHP Data Objects) extension. Here’s a basic example using MySQLi: phpCopy code <?php // Database connection parameters $servername = … Read more