This is the questions and answers section on "PHP Strings & Regular Expressions" with explanation for various interview, competitive examination and entrance test. Solved examples with detailed answer description, explanation are given and it would be easy to understand.
1. How many functions does PHP offer for searching and modifying strings using Perl-compatible regular expressions.
Answer: Option B
Explanation:
The functions are preg_filter(), preg_grep(), preg_match(), preg_match_all(), preg_quote(), preg_replace(), preg_replace_callback(), and preg_split().
2. Say we have two compare two strings which of the following function/functions can you use?
(i) strcmp()
(ii) strcasecmp()
(iii) strspn()
(iv) strcspn()
- A. (i) and (ii)
- B. (iii) and (iv)
- C. None of the mentioned
- D. All of the mentioned
Answer: Option D
Explanation:
All of the functions mentioned above can be used to compare strings in some or the other way.
3. Which one of the following functions will convert a string to all uppercase?
- A. strtoupper()
- B. uppercase()
- C. str_uppercase()
- D. struppercase()
Answer: Option A
Explanation:
Its prototype follows string
strtoupper(string str).
4. What will be the output of the following
PHP code?
< ?php
$title = "O'malley wins the heavyweight championship!";
echo ucwords($title);
?> - A. O’Malley Wins The Heavyweight Championship!
- B. O’malley Wins The Heavyweight Championship!
- C. O’Malley wins the heavyweight championship!
- D. o’malley wins the heavyweight championship!
Answer: Option D
Explanation:
The ucwords() function capitalizes the first letter of each word in a string. Its prototype follows:string ucwords(string str)
5. What will be the output of the following PHP code?
< ?php
echo str_pad("Salad", 5)." is good.";
?> - A. SaladSaladSaladSaladSalad is good
- B. is good SaladSaladSaladSaladSalad
- C. is good Salad
- D. Salad is good
Answer: Option D
Explanation:
The str_pad() function pads a string with a specified number of characters.
