PHP technical interview questions and answers are essential for candidates preparing for web development roles. PHP powers millions of websites and content management systems, so companies often evaluate your knowledge of syntax, arrays, sessions, cookies, form handling, OOP concepts, and database connectivity. Popular companies like TCS, Wipro, Infosys, Capgemini, Cognizant, and Accenture regularly include PHP questions in coding rounds and technical interviews. This guide explains the most frequently asked PHP interview questions with simple examples and clear definitions. Whether you are a fresher preparing for campus placements or an experienced developer, these questions will help you understand PHP concepts better. You can also download PHP interview PDFs and practice mock questions for better preparation.
71. How can we get second of the current time using date function?
$second = date(”s”);
72. What is the maximum size of a file that can be uploaded using PHP and how can we change this?
You can change maximum size of a file set upload_max_filesize variable in php.ini file
73. How can I make a script that can be bilingual (supports English, German)?
You can change charset variable in above line in the script to support bilanguage.
74. How can increase the performance of MySQL select query?
We can use LIMIT to stop MySql for further search in table after we have received our required no. of records, also we can use LEFT JOIN or RIGHT JOIN instead of full join in cases we have related data in two or more tables.
75. How can we change the name of a column of a table?
MySQL query to rename table: RENAME TABLE tbl_name TO new_tbl_name
or,
ALTER TABLE tableName CHANGE OldName newName.
76. What are the different ways to login to a remote server? Explain the means, advantages and disadvantages?
There is at least 3 ways to logon to a remote server:
Use ssh or telnet if you concern with security
You can also use rlogin to logon to a remote server.
77. What is the default session time in php and how can I change it?
The default session time in php is until closing of browser
78. Explain the concept of dependency injection in PHP
Dependency injection is a design pattern that allows an object to receive its dependencies from an external source rather than creating them itself, promoting better modularity and easier testing
79. What is the difference between the include and require statements in PHP
The primary difference between include and require is that include will emit a warning if the file is not found and continue executing the script, whereas require will emit a fatal error and halt the script
80. How does PHP handle sessions, and what are some best practices for session management
PHP handles sessions by generating a unique session ID for each user, which is stored on the server. Best practices include regenerating session IDs to prevent fixation, setting appropriate session timeouts, and storing sessions in a secure manner