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PHP · Question Set
Database Integration (MySQLi & PDO) interview questions for placements and exams.
Questions
4
Included in this set
Subject
PHP
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Difficulty
Mixed
Level of this set
Go through each question and its explanation. Use this set as a focused practice pack for PHP.
PDO stands for PHP Data Object. It provides a database abstraction layer that works with many database systems like MySQL, SQLite, and PostgreSQL.
$pdo = new PDO('mysql:host=localhost;dbname=test','root','pass');If mysqli_connect fails, it returns false. You can check this and display an error using mysqli_connect_error.
if(!$conn){ echo mysqli_connect_error(); }MySQLi stands for MySQL Improved. It allows PHP scripts to connect and interact with MySQL databases securely and efficiently.
$conn = mysqli_connect('localhost','root','pass','test');The mysqli_query function sends a query to the MySQL server and returns a result object for SELECT or true for successful INSERT, UPDATE, or DELETE operations.
$result = mysqli_query($conn,'SELECT * FROM users');
For complete preparation, combine this set with full subject-wise practice for PHP. You can also explore other subjects and sets from the links below.