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If you're looking for information on PHP interview questions, you've come to the right place! This guide will provide you with a comprehensive list of common PHP interview questions and answers.

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# Question Options Answer
1 What does PHP stand for?
  • Personal Home Page
  • Hypertext Preprocessor
  • Pretext Hypertext Processor
  • Preprocessor Home Page
  • Hypertext Preprocessor
    2 Which symbol is used to prepend variables in PHP?
  • %
  • &
  • $
  • @
  • $
    3 Which of the following is the correct way to declare a variable in PHP?
  • $variableName
  • variableName = value
  • $variableName = value
  • $variableName: value
  • $variableName = value
    4 Which of the following functions is used to output text in PHP?
  • echo
  • print
  • printf
  • All of the above
  • All of the above
    5 How do you create an array in PHP?
  • $array = "value1", "value2", "value3"
  • $array = array("value1", "value2", "value3")
  • $array = [value1, value2, value3]
  • array = ("value1", "value2", "value3")
  • $array = array("value1", "value2", "value3")
    6 Which of the following is used to get the length of a string in PHP?
  • strlen($string)
  • length($string)
  • size($string)
  • count($string)
  • strlen($string)
    7 Which superglobal variable is used to collect form data sent with both GET and POST methods?
  • $_BOTH
  • $_REQUEST
  • $_FORM
  • $_GET_POST
  • $_REQUEST
    8 How do you define a constant in PHP?
  • const CONSTANT_NAME = "value"
  • define("CONSTANT_NAME", "value")
  • constant("CONSTANT_NAME", "value")
  • set("CONSTANT_NAME", "value")
  • define("CONSTANT_NAME", "value")
    9 Which of the following is used to check if a variable is set and is not NULL in PHP?
  • isset()
  • empty()
  • isnull()
  • is_defined()
  • isset()
    10 Which of the following is used to connect to a MySQL database in PHP?
  • connect()
  • mysqli_connect()
  • connect_db()
  • db_connect()
  • mysqli_connect()
    11 Which function is used to start a session in PHP?
  • start_session()
  • session_start()
  • begin_session()
  • session_begin()
  • session_start()
    12 Which function is used to start a session in PHP?
  • start_session()
  • session_start()
  • begin_session()
  • session_begin()
  • session_start()
    13 Which of the following is used to terminate the execution of a script in PHP?
  • end
  • stop
  • exit
  • terminate
  • exit
    14 Which of the following is correct about PHP variables?
  • Variables must be declared before use.
  • Variables are case-sensitive.
  • Variables do not need to be declared before use.
  • Variables are case-insensitive.
  • Variables do not need to be declared before use.
    15 Which function is used to start output buffering in PHP?
  • ob_start()
  • buffer_start()
  • start_output()
  • output_buffer()
  • ob_start()
    16 Which superglobal variable holds information about headers, paths, and script locations?
  • $_GET
  • $_POST
  • $_REQUEST
  • $_SERVER
  • $_SERVER
    17 How do you remove an element from an array in PHP?
  • unset($array[index])
  • remove($array[index])
  • delete($array[index])
  • unset_array($array[index])
  • unset($array[index])
    18 Which PHP function is used to destroy a session?
  • A) session_end()
  • B) destroy_session()
  • C) end_session()
  • D) session_destroy()
  • D) session_destroy()
    19 Which PHP function is used to find the length of a string?
  • A) length()
  • B) strlen()
  • C) strlength()
  • D) size()
  • B) strlen()
    20 What function is used to search for the position of the first occurrence of a substring in a string?
  • A) strpos()
  • B) strfind()
  • C) searchstr()
  • D) findstr()
  • A) strpos()
    21 Which PHP function is used to replace all occurrences of a search string with a replacement string?
  • A) replace()
  • B) str_replace()
  • C) str_replace_all()
  • D) replace_all()
  • B) str_replace()
    22 What function converts a string to all lowercase letters in PHP?
  • A) toLower()
  • B) lowercase()
  • C) strToLower()
  • D) strtolower()
  • D) strtolower()
    23 To convert a string to all uppercase letters in PHP, you use which function?
  • A) toUpper()
  • B) uppercase()
  • C) strToUpper()
  • D) strtoupper()
  • D) strtoupper()
    24 Which PHP function is used to reverse a string?
  • A) str_reverse()
  • B) reverse_str()
  • C) strrev()
  • D) reverse()
  • C) strrev()
    25 To compare two strings in PHP, which function is used?
  • A) compare()
  • B) str_compare()
  • C) strcmp()
  • D) str_cmp()
  • C) strcmp()
    26 Which function is used to repeat a string a specified number of times in PHP?
  • A) repeat_str()
  • B) str_repeat()
  • C) str_repeat_times()
  • D) repeat()
  • B) str_repeat()
    27 What PHP function is used to split a string into an array by a specified delimiter?
  • A) split()
  • B) str_split()
  • C) explode()
  • D) str_explode()
  • C) explode()
    28 To join array elements into a single string using a delimiter, which function do you use in PHP?
  • A) join()
  • B) implode()
  • C) concat()
  • D) merge()
  • B) implode()
    29 Which PHP function is used to format a Unix timestamp into a human-readable date?
  • A) timestamp_format()
  • B) format_date()
  • C) date_format()
  • D) date()
  • D) date()
    30 What function generates a unique ID in PHP?
  • A) unique_id()
  • B) gen_unique_id()
  • C) uniqid()
  • D) generate_unique_id()
  • C) uniqid()
    31 Which PHP function is used to sort an array in ascending order?
  • A) array_sort()
  • B) sort_array()
  • C) sort()
  • D) asc_sort()
  • C) sort()
    32 To sort an array in descending order in PHP, you use which function?
  • A) rsort()
  • B) desc_sort()
  • C) sort_desc()
  • D) reverse_sort()
  • A) rsort()
    33 To sort an associative array in descending order by value in PHP, which function do you use?
  • A) arsort()
  • B) sort_desc_value()
  • C) desc_sort_assoc()
  • D) rsort_by_value()
  • A) arsort()
    34 To sort an associative array in descending order by keys in PHP, which function is used?
  • A) krsort()
  • B) sort_desc_keys()
  • C) desc_sort_keys()
  • D) rsort_keys()
  • A) krsort()
    35 Which PHP function shuffles the elements of an array randomly?
  • A) shuffle()
  • B) random_shuffle()
  • C) array_shuffle()
  • D) shuffle_array()
  • A) shuffle()
    36 What function is used to count all elements in an array in PHP?
  • A) count()
  • B) elements_count()
  • C) array_count()
  • D) count_elements()
  • A) count()
    37 Which PHP function merges two or more arrays into a single array?
  • A) array_merge()
  • B) merge_arrays()
  • C) combine_arrays()
  • D) concat_arrays()
  • A) array_merge()
    38 Which function is used to count all elements in an array?
  • A) elements_count()
  • B) array_count()
  • C) count_elements()
  • D) count()
  • D) count()
    39 How do you add an element to the end of an array?
  • A) array_append()
  • B) array_add()
  • C) array_push()
  • D) array_insert()
  • C) array_push()
    40 Which function is used to remove the last element of an array?
  • A) array_pop()
  • B) array_shift()
  • C) array_remove_last()
  • D) array_delete_last()
  • A) array_pop()
    41 What function adds one or more elements to the beginning of an array?
  • A) array_unshift()
  • B) array_push_front()
  • C) array_add_first()
  • D) array_insert_beginning()
  • A) array_unshift()
    42 Which function is used to remove the first element of an array?
  • A) array_pop()
  • B) array_shift()
  • C) array_unshift()
  • D) array_remove_first()
  • B) array_shift()
    43 How do you merge two or more arrays in PHP?
  • A) array_combine()
  • B) array_merge()
  • C) array_concat()
  • D) array_union()
  • B) array_merge()
    44 Which function is used to check if a value exists in an array?
  • A) value_exists()
  • B) in_array()
  • C) array_has_value()
  • D) array_value_exists()
  • B) in_array()
    45 How do you get all the keys of an array?
  • A) array_keys()
  • B) keys()
  • C) get_keys()
  • D) extract_keys()
  • A) array_keys()
    46 Which function returns all the values of an array?
  • A) array_values()
  • B) values()
  • C) get_values()
  • D) extract_values()
  • A) array_values()
    47 How do you sort an array in ascending order?
  • A) array_sort()
  • B) sort()
  • C) asc_sort()
  • D) sort_asc()
  • B) sort()
    48 Which function sorts an array in descending order?
  • A) rsort()
  • B) sort_desc()
  • C) desc_sort()
  • D) sort_reverse()
  • A) rsort()
    49 What function returns the number of elements in an array?
  • A) size()
  • B) length()
  • C) count()
  • D) num_elements()
  • C) count()
    50 How do you extract a slice of an array?
  • A) array_slice()
  • B) array_extract()
  • C) array_cut()
  • D) array_part()
  • A) array_slice()
    51 Which function removes a portion of an array and replaces it with something else?
  • A) array_replace()
  • B) array_splice()
  • C) array_cut_replace()
  • D) array_segment()
  • B) array_splice()
    52 What function searches an array for a given value and returns the key?
  • A) array_search()
  • B) search_array()
  • C) find_key()
  • D) key_search()
  • A) array_search()
    53 How do you apply a user function to every member of an array?
  • A) array_map()
  • B) array_apply()
  • C) array_walk()
  • D) apply_function()
  • C) array_walk()
    54 Which function returns an array with elements in reverse order?
  • A) array_reverse()
  • B) reverse()
  • C) array_flip()
  • D) reverse_array()
  • A) array_reverse()
    55 How do you remove duplicate values from an array?
  • A) array_unique()
  • B) unique_array()
  • C) array_distinct()
  • D) remove_duplicates()
  • A) array_unique()
    56 Which function calculates the sum of values in an array?
  • A) array_sum()
  • B) sum_array()
  • C) calculate_sum()
  • D) sum_values()
  • A) array_sum()
    57 How do you determine if a variable is an array?
  • A) is_array()
  • B) isArray()
  • C) array_check()
  • D) check_array()
  • A) is_array()
    58 What keyword is used to define a class in PHP?
  • A) object
  • B) class
  • C) define
  • D) create
  • B) class
    59 What is the visibility keyword to make a property or method accessible only within the class itself?
  • A) public
  • B) protected
  • C) private
  • D) internal
  • C) private
    60 How do you define a constant in a class?
  • A) const NAME = value
  • B) define("NAME", value)
  • C) $constant NAME = value
  • D) constant NAME = value
  • A) const NAME = value
    61 What keyword is used to inherit from a parent class?
  • A) inherits
  • B) extends
  • C) implements
  • D) uses
  • B) extends
    62 Which keyword is used to define a method that must be implemented by all subclasses of an abstract class?
  • A) final
  • B) static
  • C) abstract
  • D) interface
  • C) abstract
    63 What keyword is used to implement an interface in a class?
  • A) inherits
  • B) extends
  • C) implements
  • D) uses
  • C) implements
    64 Can a class implement multiple interfaces in PHP?
  • Yes
  • No
  • Not Sure
  • None
  • Yes
    65 What keyword prevents a class from being inherited?
  • A) abstract
  • B) final
  • C) sealed
  • D) private
  • B) final
    66 Which visibility keyword allows a property or method to be accessed from within the class and its subclasses?
  • A) public
  • B) protected
  • C) private
  • D) final
  • B) protected
    67 What is the keyword to make a property or method belong to the class rather than an instance?
  • A) static
  • B) final
  • C) abstract
  • D) public
  • A) static
    68 Which magic method is called when an object is serialized?
  • A) __serialize()
  • B) __unserialize()
  • C) __sleep()
  • D) __wakeup()
  • C) __sleep()
    69 What method is called when an object is destroyed?
  • A) __destroy()
  • B) __delete()
  • C) __destruct()
  • D) __remove()
  • C) __destruct()
    70 What is the visibility keyword to make a property or method accessible from outside the class?
  • A) public
  • B) protected
  • C) private
  • D) internal
  • A) public
    71 Which keyword is used to define a trait in PHP?
  • A) trait
  • B) class
  • C) interface
  • D) object
  • A) trait
    72 How do you use a trait in a class?
  • A) use TraitName
  • B) include TraitName
  • C) import TraitName
  • D) extend TraitName
  • A) use TraitName