PHP Strings
This quiz is meant for self-study to aid in learning/memorizing the string functions in PHP.
- 1.What is the output of the following code snippet? $str = 'asdfghyo off on off'; $replace_pairs = array('a' => 'q', 's' => 'w', 'd' => 'e', 'f' => 'r', 'y' => 'z', 'o' => 'i', 'off' => 'on', 'on' => 'off'); echo strtr($str, $replace_pairs);
- A.
Qwerghzi on off on
- B.
Qwerghzo on off on
- C.
Qwerghzi on on on
- D.
Qwerghzi off off off
- 2.What is the output of the following code snippet? echo stristr('PHPzphpZPHPZfoo', 'Z');
- A.
ZphpZPHPZfoo
- B.
ZPHPZfoo
- C.
Zphpzphpzfoo
- D.
PhpZPHPZfoo
- 3.What is the output of the following script? echo strlen('foo' . chr(0) . '1'), ', ', strlen(0x00);
- A.
5, 1
- B.
3, 0
- C.
3, 4
- D.
5, 0
- E.
4, 0
- 4.
- A.
To make the string's first character uppercase or lowercase, respectively.
- B.
To make the string's first word uppercase or lowercase, respectively.
- 5.What is the output of the following? echo strcmp('first', 'second'), ", "; echo strcmp('44', '054'), ", "; echo strcmp('0x80', 'a'), ", "; echo strcmp('a', 'A');
- A.
-1, 1, -1, 1
- B.
-1, 0, -1, 1
- C.
1, 0, 1, -1
- D.
-1, -1, -1, -1
- E.
-1, -1, 1, -1
- 6.What is the output of: echo strspn('1800-555-5555789', '0123456789');
- A.
1
- B.
7
- C.
4
- D.
0
- 7.What is the output of: echo strcspn('1-800-555-5555', '0');
- A.
2
- B.
3
- C.
5
- D.
0
- 8.
- A.
1, 1, 1, -1, 1
- B.
0, 0, -1, -1, 1
- C.
1, 1, -23, 1, -1
- D.
-1, 0, -1, 1, -1
- E.
0, 0, -23, -1, 1
- 9.What is the output of the following? echo substr("abcdef", -2), ', '; echo substr("abcdef", 4), ', '; echo substr("abcdef", -3, -1), ', '; echo substr("abcdef", 4, -2), ', '; echo substr("abcdef", 2, -1);
- A.
Cdef, ef, de, , cde
- B.
Ef, ef, de, e, cde
- C.
Ef, ef, de, , cdef
- D.
Ef, ef, de, , cde
- E.
Abcd, de, de, , cde
- 10.What is the output of the following? $text = 'This is a test'; echo substr_count($text, 'is'), ', ' echo substr_count($text, 'is', 3), ', '; echo substr_count($text, 'is', 3, 3), ', '; echo substr_count($text, 'is', 5, 10), ', '; $text2 = 'gcdgcdgcd'; echo substr_count($text2, 'gcdgcd');
- A.
2, 1, 0, WARNING, 1
- B.
2, 1, 0, , 1
- C.
2, 1, 0, WARNING, 2
- D.
2, 1, 0, , 2
- E.
2, 1, 1, WARNING, 1
- 11.What is the output of the following? echo str_replace('@', ' [anti-spam] ', '[email protected]', $count); echo $count . ' values found.'; $phrase = "You should eat fruits, vegetables, and fiber every day."; $healthy = array("fruits", "vegetables", "fiber"); $yummy = array("pizza", "beer", "ice cream"); echo str_replace($healthy, $yummy, $phrase); $vowels = array("a", "e", "i", "o", "u", "A", "E", "I", "O", "U"); echo str_replace($vowels, "", "Hello World of PHP");
- A.
[email protected] 0 values replaced. You should eat pizza, beer, and ice cream every day. Hll Wrld f PHP
- B.
Email [anti-spam] example.com 1 values replaced. You should eat pizza, beer, and ice cream every day. Hll Wrld f PHP
- C.
Email [anti-spam] example.com 1 values replaced. You should eat pizza, beer, and ice cream every day. Hllo World of PHP
- D.
Email [anti-spam] example.com 1 values replaced. You should eat ice cream, beer, and pizza every day. Hll Wrld f PHP
- 12.What is the output of: $string = "This is\tan example\nstring"; $tok = strtok($string, " \n\t"); while ($tok !== false) { echo "Word=$tok[br /]"; //pretend like [br /] is a real line break $tok = strtok(" \n\t"); }
- A.
This is an example string
- B.
This is an example string
- 13.What is the output of the following? $haystack = "Hello World!'; $needle = 'lo'; echo strrchr($haystack, $needle);
- A.
3
- B.
4
- C.
Llo World!
- D.
Ld!
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