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- Question
For printing out strings, there are echo, print and printf. Explain the differences.
- Correct Answer
- - echo is the most primitive of them, and just outputs the contents following the construct to the screen print is also a construct (so parentheses are optional when calling it), but it returns TRUE on successful output and FALSE if it was unable to print out the string However, you can pass multiple parameters to echo, like: and it will output the string "Welcome to TechInterviews!" print does not take multiple parameters It is also generally argued that echo is faster, but usually the speed advantage is negligible, and might not be there for future versions of PHP printf is a function, not a construct, and allows such advantages as formatted output, but it?s the slowest way to print out data out of echo, print and printf
- 1. Would you initialize your strings with single quotes or double quotes? Discuss
- 2. How do you call a constructor for a parent class? Discuss
- 3. Are objects passed by value or by reference? Discuss
- 4. Explain the ternary conditional operator in PHP? Discuss
- 5. How do you pass a variable by value? Discuss
- 6. What?s the difference between htmlentities( ) and htmlspecialchars( )? Discuss
- 7. How to open a file? Discuss
- 8. Why we use array_flip Discuss
- 9. What is a .htacces file Discuss
- 10. Can we use include ("xyz.PHP") two times in a PHP page "index.PHP"? Discuss
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Correct Answer: Since the data inside the single-quoted string is not parsed for variable substitution, it?s always a better idea speed-wise to initialize a string with single quotes, unless you specifically need variable substitution
Correct Answer: parent::constructor($value)
Correct Answer: Everything is passed by value
Correct Answer: Expression preceding the ? is evaluated, if it?s true, then the expression preceding the : is executed, otherwise, the expression following : is executed
Correct Answer: Just like in C++, put an ampersand in front of it, like $a = &$b
Correct Answer: htmlspecialchars only takes care of , single quote ?, double quote " and ampersand htmlentities translates all occurrences of character sequences that have different meaning in HTML
Correct Answer:
Correct Answer: array_flip exchange the keys with their associated values in array ie Keys becomes values and values becomes keys "php","course2"=>"html"); $new_array = array_flip($arrayName); print_r($new_array); ?> OUTPUT : Array ( [php] => course1 [html] => course2 )
Correct Answer: htaccess is a configuration file running on Apache serverThese htaccess file used to change the functionality and features of apache web server eg htaccess file used for url rewrite htaccess file used to make the site password protected htaccess file can restrict some ip addresses ,so that on restricted ip adresses site will not open
Correct Answer: Yes we can use include("xyzphp") more than one time in any page but it create a prob when xyzphp file contain some funtions declaration then error will come for already declared function in this file else not a prob like if you want to show same content two time in page then must incude it two time not a prob
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