55 PHP Interview Questions

While different interviewers may ask distinctive questions, it always helps to be prepared for severe grilling. So we have to drawn up a list of frequently asked 55 php interview questions. Read all the questions and prepare answers dotted with examples for success in the job interview.

  1. What is PHP?
  2. What is a Session?
  3. What is meant by PEAR in php?
  4. How can we know the number of days between two given dates using PHP?
  5. What is the difference between $message and $$message?
  6. What does a special set of tags do in PHP?
  7. What is a Persistent Cookie?
  8. How can we repair a MySQL table?
  9. What are the differences between require and include, include_once?
  10. What is meant by urlencode and urldecode?
  11. How do you define a constant?
  12. What is the difference between mysql_fetch_object and mysql_fetch_array?
  13. How To Get the Uploaded File Information in the Receiving Script?
  14. How can i execute a PHP script using command line?
  15. Would i use print "$a dollars" or "{$a} dollars" to print out the amount of dollars in this example?
  16. How To Create a Table?
  17. How can we encrypt the username and password using PHP?
  18. What is the functionality of the functions STRSTR() and STRISTR()?
  19. How To Protect Special Characters in Query String?
  20. What are the differences between DROP a table and TRUNCATE a table?
  21. WHAT ARE THE DIFFERENT TYPES OF ERRORS IN PHP?
  22. What are the differences between GET and POST methods in form submitting, give the case where we can use GET and we can use POST methods?
  23. What is the difference between the functions unlink and unset?
  24. How can we register the variables into a session?
  25. How can we create a database using PHP and mysql?
  26. How many ways we can retrieve the date in result set of mysql using php?
  27. What is the difference between htmlentities() and htmlspecialchars()?
  28. So if md5() generates the most secure hash, why would you ever use the less secure crc32() and sha1()?
  29. How can we destroy the session, how can we unset the variable of a session?
  30. How many values can the SET function of MySQL take?
  31. How many ways we can we find the current date using MySQL?
  32. What is meant by MIME?
  33. How can we know that a session is started or not?
  34. What are the differences between mysql_fetch_array(), mysql_fetch_object(), mysql_fetch_row()?
  35. What is the difference between PHP4 and PHP5?
  36. How to retrieve values from one database server and store them in other database server using PHP?
  37. What are the functions for IMAP?
  38. How can we increase the execution time of a php script?
  39. How to set cookies?
  40. How to reset/destroy a cookie?
  41. What are the current versions of Apache, PHP, and MySQL?
  42. What are the features and advantages of OBJECT ORIENTED PROGRAMMING?
  43. What are the reasons for selecting LAMP (Linux, Apache, MySQL, Php) instead of combination of other software programs, servers and operating systems?
  44. What is the use of friend function?
  45. What are the difference between abstract class and interface?
  46. What are the advantages of stored procedures, triggers, indexes?
  47. What is maximum size of a database in mysql?
  48. What type of inheritance that php supports?
  49. How to increase the performance of MySQL select query?
  50. How to use the COM components in php?
  51. How to set a cron and how can I execute it in Unix, Linux, and windows?
  52. How many ways I can redirect a PHP page?
  53. How to store the uploaded file to the final location?
  54. Explain about Type Juggling in php?
  55. How can I embed a java programme in php file and what changes have to be done in php.ini file?