PHP Interview Questions & Answers
PHP Interview Online Test
1. What does a special set of tags do in PHP?
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2. whats the difference between include and require?
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3. Would I use print "$a dollars" or "{$a} dollars" to print out the amount of dollars in this example?
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4. How do you define a constant?
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5. How do you pass a variable by value?
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6. Will comparison of string "10" and integer 11 work in PHP?
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7. When are you supposed to use endif to end the conditional statement?
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8. Explain the ternary conditional operator in PHP?
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9. How do I find out the number of parameters passed into function?
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10. If the variable $a is equal to 5 and variable $b is equal to character a, whats the value of $$b?
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11. whats the difference between accessing a class method via -> and via ::?
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12. Are objects passed by value or by reference?
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13. How do you call a constructor for a parent class?
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14. whats the special meaning of __sleep and __wakeup?
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15. Why doesnt the following code print the newline properly?
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16. whats PHP
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17. What Is a Session?
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18. What is meant by PEAR in php?
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19. What does a special set of tags do in PHP?
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20. How do you define a constant?
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21. What is the difference between mysql_fetch_object and mysql_fetch_array?
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22. How can I execute a PHP script using command line?
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23. I am trying to assign a variable the value of 0123, but it keeps coming up with a different number, whats the problem?
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24. How do you pass a variable by Refernce?
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25. How do I find out the number of parameters passed into function9. ?
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26. If the variable $a is equal to 5 and variable $b is equal to character a, whats the value of $$b?
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27. What are the differences between DROP a table and TRUNCATE a table?
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28. Why doesnt the following code print the newline properly?
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29. Would you initialize your strings with single quotes or double quotes?
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30. What is the difference between the functions unlink and unset?
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31. How come the code works, but doesnt for two-dimensional array of mine?
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32. How can we register the variables into a session?
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33. What is the difference between characters 23 and \x23?
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34. How can we submit form without a submit button?
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35. How can we create a database using PHP and mysql?
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36. How many ways we can retrieve the date in result set of mysql using php?
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37. Can we use include (”abc.php”) two times in a php page “makeit.php”?
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38. I am writing an application in PHP that outputs a printable version of driving directions. It contains some long sentences, and I am a neat freak, and would like to make sure that no line exceeds 50 characters. How do I accomplish that with PHP?
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39. whats the difference between htmlentities() and htmlspecialchars()?
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40. What is the maximum length of a table name, a database name, or a field name in MySQL?
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41. How many values can the SET function of MySQL take?
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42. What are the other commands to know the structure of a table using MySQL commands except EXPLAIN command?
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43. How can we find the number of rows in a table using MySQL?
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44. whats the difference between md5(), crc32() and sha1() crypto on PHP?
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45. How can we find the number of rows in a result set using PHP?
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46. How many ways we can we find the current date using MySQL?
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47. How can we encrypt and decrypt a data present in a mysql table using mysql?
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48. Will comparison of string “10″ and integer 11 work in PHP?
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49. What is the functionality of MD5 function in PHP?
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50. How can I load data from a text file into a table?
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51. How can we know the number of days between two given dates using MySQL?
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52. How can we change the name of a column of a table?
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53. How can we change the data type of a column of a table?
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54. How can we know that a session is started or not?
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55. If we login more than one browser windows at the same time with same user and after that we close one window, then is the session is exist to other windows or not? And if yes then why? If no then why?
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56. What are the MySQL database files stored in system ?
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57. What is the difference between PHP4 and PHP5?
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58. Can we use include(abc.PHP) two times in a PHP page makeit.PHP”?
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59. How can we encrypt and decrypt a data presented in a table using MySQL?
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60. How can I retrieve values from one database server and store them in other database server using PHP?
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61. What are the functions for IMAP?
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62. What are encryption functions in PHP?
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63. What is the difference between htmlentities() and htmlspecialchars()?
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64. What is the functionality of the function htmlentities?
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65. How can we get the properties (size, type, width, height) of an image using php image functions?
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66. How to reset/destroy a cookie
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67. How many ways can we get the value of current session id?
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68. How can we destroy the cookie?
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69. What are the current versions of Apache, PHP, and MySQL?
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70. What are the reasons for selecting LAMP (Linux, Apache, MySQL, Php) instead of combination of other software programs, servers and operating systems?
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71. How can we get second of the current time using date function?
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72. What is the maximum size of a file that can be uploaded using PHP and how can we change this?
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73. How can I make a script that can be bilingual (supports English, German)?
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74. How can increase the performance of MySQL select query?
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75. How can we change the name of a column of a table?
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76. What are the different ways to login to a remote server? Explain the means, advantages and disadvantages?
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77. What is the default session time in php and how can I change it?
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78. Explain the concept of dependency injection in PHP
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79. What is the difference between the include and require statements in PHP
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80. How does PHP handle sessions, and what are some best practices for session management
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81. What is the purpose of namespaces in PHP
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82. Discuss the use of Composer in PHP and why it is important
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83. What is the difference between traits and interfaces in PHP
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84. How can you prevent SQL injection attacks in PHP
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85. Explain the concept of late static binding in PHP
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86. What are the differences between GET and POST methods in form submission, and when would you use each
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87. Describe the difference between error handling with try-catch blocks and using custom error handlers in PHP
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88. How does PHP manage memory, and what are some common memory management issues
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89. Explain how object cloning works in PHP
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90. What are PSR standards, and why are they important in PHP development
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91. How do you handle file uploads securely in PHP
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92. What is the difference between the final keyword and abstract keyword in PHP
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93. How do you implement MVC architecture in PHP
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94. What are the advantages and disadvantages of using PHP as a backend language
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95. Discuss the purpose of the SPL (Standard PHP Library) and give examples of its use
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96. What is the significance of autoloading in PHP, and how does it work
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97. How can you improve the performance of a PHP application
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98. What are closures in PHP, and how are they used
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99. Describe how session management works in PHP and how to handle session fixation
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100. What is the role of the __invoke() method in PHP
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101. How do you implement error logging in PHP, and why is it important
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102. Explain how to use cURL in PHP to make HTTP requests
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103. What are the differences between static and dynamic binding in PHP
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104. How does the garbage collector work in PHP, and when would you need to manage memory manually
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105. What is the role of the Composer autoload feature, and how does it work
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106. Describe the difference between asynchronous and synchronous processing in PHP
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107. How do you implement pagination in a PHP application
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108. What is the role of the PDO class in PHP, and how does it differ from MySQLi
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109. Explain the significance of dependency management in PHP and how to achieve it using Composer
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