Advanced PHP Interviews Questions

 Can we use include ("ABC.PHP”) two times in a PHP page “index.PHP”?

Answers: Yes we can use include("ABC.php”) more than one time in any page. but it creates a prob when xyz.php file contains some functions declaration then an error will come for already declared function in this file else not a prob like if you want to show same content two times in the page then must include it two times not a prob.

What are the different tables present in MySQL, which one is
default?

Answers : Following tables (Storage Engine) we can create
1. MyISAM(The default storage engine IN MYSQL Each MyISAM table is
stored on disk in three files. The files have names that begin with the table name
and have an extension to indicate the file type. An .frm file stores the table format.
The data file has an .MYD  extension. The index file has an .MYI
2. InnoDB(InnoDB is a transaction-safe (ACID compliant) storage engine for
MySQL that has commit, rollback, and crash recovery capabilities to protect user
data.)
3. Merge
4. Heap (MEMORY)(The MEMORY storage engine creates tables with contents
that are stored in memory. Formerly, these were known as HEAP tables. 

What is use of header() function in php ?

Answers :The header() function sends a raw HTTP header to a client.We can use
herder()
function for redirection of pages. It is important to notice that header() must
be called before any actual output is seen.

 How can I execute a PHP script using command line?
Answers :Just run the PHP CLI (Command Line Interface) program and
provide the PHP script file name as the command line argument.

 Suppose your Zend engine supports the mode Then how can you
configure your PHP Zend engine to support mode ?
Answers :In php.ini file:
set 
short_open_tag=on
to make PHP support

 Shopping cart online validation i.e. how can we configure Paypal, etc.?
Answers :Nothing more we have to do only redirect to the payPal url after submit
all information needed by paypal like amount,adresss etc.

 What is meant by nl2br()?

Inserts HTML line breaks (

) before all newlines in a string.

What is PHP Requirements?
ANS:  HTML, CSS, Javascript, Jquery, Mysql, Bootstrap, database Handling Server Manage PHP.
a web host with PHP and MySQL support
Installation a web server on your own PC, and then install PHP and MySQL

What Is the Use Of PHP?
PHP Is Used For PHP Web Development We have Created with Website Functionality Like Dynamic content, CMS, Web site Form Handling, Read Write, Open Close File, Function Module Design, Encrypt Data, Add Delete Update Fetch Data.

Why I Select Php  For Web Development?
PHP is a Wide World Language, Currently, PHP 8.0 Version Launch in 2021, Php Biggest Language For Web Development Filed, According To WWW PHP Websites In the World 60%  Website Are Used PHP Language  Backend Design.
PHP Is Very Fast other Then Languages
PHP Smart Language error Handling
PHP Easy To Connect With Other HTML, CSS, Javascript.

What Are Php String Functions?

1. echo() Outputs one or more strings
2. explode() Breaks a Str into an array
3. crc32() Calculates a 32-bit CRC for a string
4. crypt() One-way Str hashing
5. strtolower() Converts a Str to lowercase letters
6. strtoupper() Converts a Str to uppercase letters
7. strtr() Translates certain characters in a string
8. substr() Returns a part of a string
9.  
10. fprintf() Writes a formatted Str to a specified output stream
11. get_html_translation_table() Returns the translation table used by htmlspecialchars() and htmlentities()
12. htmlspecialchars() Converts some predefined characters to HTML entities
13. implode() Returns a str from the elements of an array
14. join() Alias of implode()
15.  
16.  
17. addcslashes() The Returns a str with backslashes in front of the specified Char
18. addslashes() Returns a str with backslashes in front of predefined Char
19. bin2hex() Converts a str of ASCII characters to hexadecimal values
20. chop() Removes whitespace or other characters from the right end of a string
21. chr() Returns a character from a specified ASCII value
22. chunk_split() Splits a str into a series of smaller parts
23. convert_cyr_string() Converts a Str from one Cyrillic character-set to another
24. convert_uudecode() Decodes a uuencoded string
25. convert_uuencode() Encodes a Str using the uuencode algorithm
26. count_chars() Returns information about characters used in a string
27. hebrev() Converts Hebrew text to visual text
28. hebrevc() Converts Hebrew text to visual text and new lines (\n) into
29.  
30. hex2bin() Converts a Str of hexadecimal values to ASCII characters
31. html_entity_decode() Converts HTML entities to characters
32. htmlentities() Converts characters to HTML entities
33. htmlspecialchars_decode() Converts some predefined HTML entities to characters
34. lcfirst() Converts the first character of a Str to lowercase
35. levenshtein() Returns the Levenshtein distance between two strings
36. localeconv() Returns locale numeric and monetary formatting information
37. ltrim() Removes whitespace or other characters from the left side of a string
38. md5() Calculates the MD5 hash of a string
39. md5_file() Calculates the MD5 hash of a file
40. metaphone() Calculates the metaphone key of a string
41. money_format() Returns a Str formatted as a currency string
42. nl_langinfo() Returns specific local information
43. nl2br() Inserts HTML line breaks in front of each newline in a string
44. number_format() Formats a number with grouped thousands
45. ord() Returns the ASCII value of the first character of a string
46. parse_str() Parses a query Str into variables
47. print() Outputs one or more strings
48. printf() Outputs a formatted string
49. quoted_printable_decode() Converts a quoted-printable Str to an 8-bit string
50. quoted_printable_encode() Converts an 8-bit Str to a quoted printable string
51. quotemeta() Quotes meta characters
52. rtrim() Removes whitespace or other characters from the right side of a string
53. setlocale() Sets locale information
54. sha1() Calculates the SHA-1 hash of a string
55. sha1_file() Calculates the SHA-1 hash of a file
56. similar_text() Calculates the similarity between two strings
57. soundex() Calculates the soundex key of a string
58. sprintf() Writes a formatted Str to a variable
59. sscanf() Parses input from a Str according to a format
60. str_getcsv() Parses a CSV Str into an array
61. str_ireplace() Replaces some characters in a Str (case-insensitive)
62. str_pad() Pads a Str to a new length
63. str_repeat() Repeats a Str a specified number of times
64. str_replace() Replaces some characters in a Str (case-sensitive)
65. str_rot13() Performs the ROT13 encoding on a string
66. str_shuffle() Randomly shuffles all characters in a string
67. str_split() Splits a Str into an array
68. str_word_count() Count the number of words in a string
69. strcasecmp() Compares two strings (case-insensitive)
70. strchr() Finds the first occurrence of a Str inside another Str (alias of strstr())
71. strcmp() Compares two strings (case-sensitive)
72. strcoll() Compares two strings (locale based Str comparison)
73. strcspn() Returns the number of characters found in a Str before any part of some specified characters are found
74. strip_tags() Strips HTML and PHP tags from a string
75. stripcslashes() Unquotes a Str quoted with addcslashes()
76. stripslashes() Unquotes a Str quoted with addslashes()
77. stripos() Returns the position of the first occurrence of a Str inside another Str (case-insensitive)
78. stristr() Finds the first occurrence of a Str inside another Str (case-insensitive)
79. strlen() Returns the length of a string
80. strnatcasecmp() Compares two strings using a "natural order" algorithm (case-insensitive)
81. strnatcmp() Compares two strings using a "natural order" algorithm (case-sensitive)
82. strncasecmp() Str comparison of the first n characters (case-insensitive)
83. strncmp() Str comparison of the first n characters (case-sensitive)
84. strpbrk() Searches a Str for any of a set of characters
85. strpos() Returns the position of the first occurrence of a Str inside another Str (case-sensitive)
86. strrchr() Finds the last occurrence of a Str inside another string
87. strrev() Reverses a string
88. strripos() Finds the position of the last occurrence of a Str inside another Str (case-insensitive)
89. strrpos() Finds the position of the last occurrence of a Str inside another Str (case-sensitive)
90. strspn() Returns the number of characters found in a Str that contains only characters from a specified charlist
91. strstr() Finds the first occurrence of a Str inside another Str (case-sensitive)
92. strtok() Splits a Str into smaller strings
93. substr_compare() Compares two strings from a specified start position (binary safe and optionally case-sensitive)
94. vprintf() Outputs a formatted string
95. vsprintf() Writes a formatted Str to a variable
96. wordwrap() Wraps a Str to a given number of characters
97. substr_count() Counts the number of times a subStr occurs in a string
98. substr_replace() Replaces a part of a Str with another string
99. trim() Removes whitespace or other characters from both sides of a string
100. ucfirst() Converts the first character of a Str to uppercase
101. ucwords() Converts the first character of each word in a Str to uppercase
102. vfprintf() Writes a formatted Str to a specified output stream

What are The PHP arr Functions?

1. array() Creates an array
2. array_change_key_case() Changes all key  in an arr to lowercase or uppercase
3. array_chunk() Splits an arr into chunks of arrays
4. array_column() Returns the values from a single column in the input array
5. array_combine() Creates an arr by using the elements from one "keys" arr and one "values" array
6. array_count_values() Counts all the values of an array
7. array_diff() Compare arrays, and returns the differences (compare values only)
8. array_diff_assoc() Compare arrays, and returns the differences (compare key  and values)
9. array_diff_key() Compare arrays, and returns the differences (compare key  only)
10. array_diff_uassoc() Compare arrays, and returns the differences (compare key  and values, using a user-defined key comparison function)
11. array_diff_ukey() Compare arrays, and returns the differences (compare key  only, using a user-defined key comparison function)
12. array_fill() Fills an arr with values
13. array_fill_keys() Fills an arr with values, specifying keys
14. array_filter() Filters the values of an arr using a callback function
15. array_flip() Flips/Exchanges all key  with their associated values in an array
16. array_intersect() Compare arrays, and returns the matches (compare values only)
17. array_intersect_assoc() Compare arrays and returns the matches (compare key  and values)
18. array_intersect_key() Compare arrays, and returns the matches (compare key  only)
19. array_intersect_uassoc() Compare arrays, and returns the matches (compare key  and values, using a user-defined key comparison function)
20. array_intersect_ukey() Compare arrays, and returns the matches (compare key  only, using a user-defined key comparison function)
21. array_key_exists() Checks if the specified key exists in the array
22. array_keys() Returns all the key  of an array
23. array_map() Sends each value of an arr to a user-made function, which returns new values
24. array_merge() Merges one or more arrays into one array
25. array_merge_recursive() Merges one or more arrays into one arr recursively
26. array_multisort() Sorts multiple or multi-dimensional arrays
27. array_pad() Inserts a specified number of items, with a specified value, to an array
28. array_pop() Deletes the last element of an array
29. array_product() Calculates the product of the values in an array
30. array_push() Inserts one or more elements to the end of an array
31. array_rand() Returns one or more random key  from an array
32. array_reduce() Returns an arr as a string, using a user-defined function
33. array_replace() Replaces the values of the first arr with the values from following arrays
34. array_replace_recursive() Replaces the values of the first arr with the values from following arrays recursively
35. array_reverse() Returns an arr in the reverse order
36. array_search() Searches an arr for a given value and returns the key
37. array_shift() Removes the first element from an array, and returns the value of the removed element
38. array_slice() Returns selected parts of an array
39. array_splice() Removes and replaces specified elements of an array
40. array_sum() Returns the sum of the values in an array
41. array_udiff() Compare arrays, and returns the differences (compare values only, using a user-defined key comparison function)
42. array_udiff_assoc() Compare arrays, and returns the differences (compare key  and values, using a built-in function to compare the key  and a user-defined function to compare the values)
43. array_udiff_uassoc() Compare arrays, and returns the differences (compare key  and values, using two user-defined key comparison functions)
44. array_uintersect() Compare arrays, and returns the matches (compare values only, using a user-defined key comparison function)
45. array_uintersect_assoc() Compare arrays, and returns the matches (compare key  and values, using a built-in function to compare the key  and a user-defined function to compare the values)
46. array_uintersect_uassoc() Compare arrays, and returns the matches (compare key  and values, using two user-defined key comparison functions)
47. array_unique() Removes duplicate values from an array
48. array_unshift() Adds one or more elements to the beginning of an array
49. array_values() Returns all the values of an array
50. array_walk() Applies a user function to every member of an array
51. array_walk_recursive() Applies a user function recursively to every member of an array
52. arsort() Sorts an associative arr in descending order, according to the value
53. asort() Sorts an associative arr in ascending order, according to the value
54. compact() Create arr containing variables and their values
55. count() Returns the number of elements in an array
56. current() Returns the current element in an array
57. each() Deprecated from PHP 7.2. Returns the current key and value pair from an array
58. end() Sets the internal pointer of an arr to its last element
59. extract() Imports variables into the current symbol table from an array
60. in_array() Checks if a specified value exists in an array
61. key() Fetches a key from an array
62. krsort() Sorts an associative arr in descending order, according to the key
63. ksort() Sorts an associative arr in ascending order, according to the key
64. list() Assigns variables as if they were an array
65. natcasesort() Sorts an arr using a case insensitive "natural order" algorithm
66. natsort() Sorts an arr using a "natural order" algorithm
67. next() Advance the internal arr pointer of an array
68. pos() Alias of current()
69. prev() Rewinds the internal arr pointer
70. range() Creates an arr containing a range of elements
71. reset() Sets the internal pointer of an arr to its first element
72. rsort() Sorts an indexed arr in descending order
73. shuffle() Shuffles an array
74. sizeof() Alias of count()
75. sort() Sorts an indexed arr in ascending order
76. uasort() Sorts an arr by values using a user-defined comparison function
77. uksort() Sorts an arr by key  using a user-defined comparison function
78. usort() Sorts an arr using a user-defined comparison function

What Are the Date Function in PHP?

1. checkdate() Validates a Gregorian date
2. date_add() Adds days, months, years, hours, minutes, and seconds to a date
3. date_create_from_format() Return  a new DateTime object formatted according to a specified format
4. date_create() Return  a new DateTime object
5. date_date_set() Sets a new date
6. date_default_timezone_get() Return  the default timezone used by all date/time functions
7. date_default_timezone_set() Sets the default timezone used by all date/time functions
8. date_diff() Return  the difference between two dates
9. date_format() Return  a date formatted according to a specified format
10. date_get_last_errors() Return  the warnings/errors found in a date string
11. date_interval_create_from_date_string() Sets up a DateInterval from the relative parts of the string
12. date_interval_format() Formats the interval
13. date_isodate_set() Sets the ISO date
14. date_modify() Modifies the timestamp
15. date_offset_get() Return  the timezone offset
16. date_parse_from_format() Return  an associative array with detailed info about a specified date, according to a specified format
17. date_parse() Return  an associative array with detailed info about a specified date
18. date_sub() Subtracts days, months, years, hours, minutes, and seconds from a date
19. date_sun_info() Return  an array containing info about sunset/sunrise and twilight begin/end, for a specified day and location
20. date_sunrise() Return  the sunrise time for a specified day and location
21. date_sunset() Return  the sunset time for a specified day and location
22. date_time_set() Sets the time
23. date_timestamp_get() Return  the Unix timestamp
24. date_timestamp_set() Sets the date and time based on a Unix  
25. date_timezone_get() Return  the time zone of the given DateTime object
26. date_timezone_set() Sets the time zone for the DateTime object
27. date() Formats a local date and time
28. getdate() Return  date/time information of a timestamp or the current local date/time
29. gettimeofday() Return  the current time
30. gmdate() Formats a GMT/UTC date and time
31. gmmktime() Return  the Unix timestamp for a GMT date
32. gmstrftime() Formats a GMT/UTC date and time according to locale settings
33. idate() Formats a local time/date as integer
34. localtime() Return  the local time
35. microtime() Return  the current Unix timestamp with microseconds
36. mktime() Return  the Unix timestamp for a date
37. strftime() Formats a local time and/or date according to locale settings
38. strptime() Parses a time/date generated with strftime()
39. strtotime() Parses an English textual datetime into a Unix timestamp
40. time() Return  the current time as a Unix timestamp
41. timezone_abbreviations_list() Return  an associative array containing dst, offset, and the timezone name
42. timezone_identifiers_list() Return  an indexed array with all timezone identifiers
43. timezone_location_get() Return  location information for a specified timezone
44. timezone_name_from_ abbr() Return  the timezone name from abbreviation
45. timezone_name_get() Return  the name of the timezone
46. timezone_offset_get() Return  the timezone offset from GMT
47. timezone_open() Creates new DateTimeZone object
48. timezone_transitions_get() Return  all transitions for the timezone
49. timezone_version_get() Return  the version of the timezonedb

Most Using Functions In php?

1. count
2. is_array
3. substr
4. in_array
5. explode
6. str_replace
7. implode
8. strlen
9. strpos
10. preg_match
11. sprintf
12. trim
13. strtolower
14. file_exists
15. is_string
16. preg_replace
17. file_get_contents
18. array_key_exists
19. array_keys
20. dirname
21. function_exists
22. array_map
23. get_class
24. class_exists
25. is_object
26. time
27. json_encode
28. date
29. is_null
30. is_numeric
31. array_shift
32. defined
33. is_dir
34. json_decode
35. header
36. strtoupper
37. array_values
38. md5
39. method_exists
40. file_put_contents
41. rtrim
42. array_pop
43. unlink
44. basename
45. realpath
46. call_user_func
47. call_user_func_array
48. fopen
49. microtime
50. fclose
51. is_int
52. is_file
53. array_slice
54. preg_match_all
55. intval
56. str_repeat
57. serialize
58. array_filter
59. mkdir
60. is_callable
61. ltrim
62. ob_start
63. round
64. fwrite
65. array_unique
66. array_search
67. reset
68. array_unshift
69. parse_url
70. func_get_args
71. end
72. base64_encode
73. unserialize
74. max
75. preg_split
76. gettype
77. strrpos
78. version_compare
79. array_push
80. floor
81. strtotime
82. htmlspecialchars
83. ini_get
84. ini_set
85. chr
86. extension_loaded
87. is_bool
88. ksort
89. array_reverse
90. ord
91. uniqid
92. strtr
93. array_diff
94. error_reporting
95. ceil
96. urlencode
97. min
98. print_r