PHP & MySQL Technical Questions – codewindow.in

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PHP & MySql - Questions

1. What is PHP and what is it used for?

2. What is the difference between PHP and other programming languages like Java or Python?

3. What is a PHP script and how do you run it?

4. How to define a variable in PHP?

5. What are the different data types in PHP and how do you declare them?

6. What is an array in PHP and what are the different types of arrays?

7. How to handle user input in PHP?

8. How to perform conditional statements in PHP?

9. What is a loop in PHP and what are the different types of loops?

10. What is a function in PHP and how do you create and call one?

11. What is an object-oriented programming and how does it work in PHP?

12. What is the difference between include and require statements in PHP?

13. How to connect to a database using PHP and perform CRUD operations?

14. What are some of the common security issues in PHP and how do you prevent them?

15. What is the use of $_SERVER superglobal in PHP?

16. What is an if statement in PHP and how do you use it?

17. What is a switch statement in PHP and when is it used?

18. How to perform nested if statements in PHP?

19. What is the ternary operator in PHP and how do you use it?

20. What is a for loop in PHP and how do you use it?

21. What is a while loop in PHP and how do you use it?

22. What is a do-while loop in PHP and how do you use it?

23. What is a foreach loop in PHP and how do you use it?

24. What is the difference between for and foreach loops in PHP?

25. How to break or continue a loop in PHP?

26. What is a nested loop in PHP and how do you use it?

27. What is a function in PHP and how do you create one?

28. What is a built-in function in PHP and how do you use it?

29. How to pass parameters to a function in PHP?

30. How to return a value from a function in PHP?

31. What is a callback function in PHP and how do you use it?

32. What is a variadic function in PHP and how do you use it?

33. What is a recursive function in PHP and how do you use it?

34. How to define default values for function parameters in PHP?

35. How to pass variables by reference in PHP?

36. What is a closure in PHP and how do you use it?

37. What is a namespaced function in PHP and how do you use it?

38. What is an array in PHP and how do you create one?

39. What are the different types of arrays in PHP?

40. How to access elements in an array in PHP?

41. How to add or remove elements from an array in PHP?

42. What is an associative array in PHP and how do you create one?

43. How to sort an array in PHP?

44. What is a multidimensional array in PHP and how do you create one?

45. How to search for an element in an array in PHP?

46. How to merge two arrays in PHP?

47. What is the difference between array_values and array_keys in PHP?

48. What is the use of array_unique and array_flip functions in PHP?

49. What is the use of array_map and array_filter functions in PHP?

50. How to create an HTML form in PHP and what are the different form elements?

51. How to submit a form in PHP and retrieve the form data on the server side?

52. What is the $_POST or $_GET superglobal in PHP and how do you use it to retrieve form data?

53. How to validate form data in PHP?

54. What is CSRF protection and how do you implement it in PHP?

55. How to handle file uploads in PHP?

56. What is the difference between the $_GET and $_POST methods in PHP?

57. How to sanitize and validate user input in PHP to prevent security issues?

58. What is the use of the $_REQUEST superglobal in PHP?

59. How to handle radio buttons, checkboxes, and select dropdowns in PHP forms?

60. What is the difference between a file and a directory in PHP?

61. How to create and delete a file in PHP?

62. How to read from and write to a file in PHP?

63. What is the use of the fopen, fclose, fread, and fwrite functions in PHP?

64. How to check if a file exists in PHP?

65. How to get the size of a file in PHP?

66. How to upload a file in PHP?

67. How to create and delete a directory in PHP?

68. What is the use of the scandir function in PHP?

69. How to copy and move files in PHP?

70. What is the difference between a file and a binary file in PHP?

71. What is the use of the file_get_contents and file_put_contents functions in PHP?

72. What is PHP and what is it used for?

73. How to connect to a MySQL database in PHP?

74. What is the difference between mysql_connect and mysqli_connect?

75. How to perform a basic CRUD operation in PHP and MySQL?

76. What is the function to execute a SQL query in PHP and MySQL?

77. What is SQL injection and how can it be prevented in PHP?

78. How to secure database credentials in PHP?

79. What is a prepared statement in PHP and how does it enhance security?

80. How to optimize a database query in PHP and MySQL?

81. Explain the use of transactions in PHP and MySQL?

82. What is an exception in PHP?

83. How can you log and track exceptions in PHP and MySQL to facilitate debugging and error analysis?

84. What is the difference between an exception and an error in PHP?

85. How to handle exceptions in PHP?

86. What is the role of the “try” and “catch” blocks in exception handling?

87. How to re-throw an exception in PHP?

88. How to define a custom exception in PHP?

89. How to debug uncaught exceptions in PHP?

90. What is the difference between exceptions and assertions in PHP?

91. How to trigger an exception in PHP?

92. What is the significance of the “finally” block in exception handling in PHP?

93. What is MySQL and what is it used for?

94. How does MySQL handle concurrency and locking?

95. Explain the structure of a MySQL database and tables?

96. What is a primary key and what is its role in a MySQL table?

97. What is a query and how do you perform a basic SELECT operation in MySQL?

98. Explain the difference between INNER JOIN, LEFT JOIN and RIGHT JOIN in MySQL?

99. How to optimize a slow MySQL query?

100. Explain the concept of transactions and how they work in MySQL?

101. What is a stored procedure and how to create one in MySQL?

102. Describe the differences between MyISAM and InnoDB storage engines in MySQL?

103. What is CRUD and how does it relate to PHP applications?

104. Describe the basic steps for creating a new record in a PHP application using CRUD?

105. How to read and display data from a database in a PHP application using CRUD?

106. Explain the process of updating a record in a PHP application using CRUD?

107. How to delete a record in a PHP application using CRUD?

108. Discuss the security considerations when implementing CRUD in a PHP application?

109. How to handle errors and exceptions in a PHP CRUD application?

110. Describe the process of validating user input before performing a CRUD operation in a PHP application?

111. How to optimize the performance of a PHP CRUD application?

112. Explain the use of pagination when reading data from a database in a PHP CRUD application?

113. Explain the concept of object-oriented programming (OOP) and its benefits?

114. Describe the structure of a class in PHP and its properties and methods?

115. How to create an object from a class in PHP and access its properties and methods?

116. Explain inheritance in PHP and how it is used in OOP?

117. What is polymorphism and how is it implemented in PHP OOP?

118. How to use abstract classes and interfaces in PHP OOP?

119. Describe the use of access modifiers (e.g. public, private, protected) in PHP OOP?

120. How to handle errors and exceptions in PHP OOP?

121. Explain the difference between method overloading and method overriding in PHP OOP?

122. Discuss the concept of design patterns in PHP OOP and give an example of a common pattern used in PHP applications?

123. Explain the concept of user authentication and authorization in PHP applications?

124. How to implement a login system in PHP to regulate page access?

125. Describe the use of sessions and cookies to maintain user authentication status in PHP applications?

126. How to secure user passwords in a PHP application and what is the best practice for password storage?

127. Discuss the importance of implementing proper access controls in a PHP application to regulate page access?

128. How to manage user roles and permissions in a PHP application?

129. Describe the implementation of a logout feature in a PHP application?

130. How to handle session hijacking and other security threats in PHP applications?

131. Explain the use of HTTPS and SSL certificates to secure user data in PHP applications?

132. How to handle user input validation in PHP to prevent security risks such as SQL injection and XSS attacks?

133. Explain the concept of namespaces in PHP and its use in organizing code?

134. How to implement error handling and debugging in PHP applications?

135. Describe the use of magic methods and how they are implemented in PHP OOP?

136. How to work with files and directories in PHP, including reading and writing to files?

137. Discuss the use of regular expressions in PHP and how they are used to match and manipulate strings?

138. How to use the SPL (Standard PHP Library) to extend the functionality of PHP applications?

139. Explain the concept of closures and anonymous functions in PHP and their use cases?

140. How to implement efficient caching in PHP applications to improve performance?

141. Describe the use of traits in PHP and how they can be used to share code between classes?

142. How to work with REST APIs in PHP, including sending and receiving data using HTTP requests?

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