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WithoutBook LIVE Mock Interviews PHP Related interview subjects: 20

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Know the top PHP interview questions and answers for freshers and experienced candidates to prepare for job interviews.

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Know the top PHP interview questions and answers for freshers and experienced candidates to prepare for job interviews.

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Freshers / Beginner level questions & answers

Ques 2

Would I use print "$a dollars" or "{$a} dollars" to print out the amount of dollars in this example?

In this example it wouldn't matter, since the variable is all by itself, but if you were to print something like "{$a},000,000 mln dollars", then you definitely need to use the braces.
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Ques 6

Explain the ternary conditional operator in PHP?

Expression preceding the ? is evaluated, if it's true, then the expression preceding the : is executed, otherwise, the expression following : is executed.
E.g $id = isset($_GET['id']) ? $_GET['id'] : false;
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Ques 8

Why doesn't the following code print the newline properly?                 $str = 'Hello, there.nHow are you?
            print $str;
    ?>


Because inside the single quotes the n character is not interpreted as newline, just as a sequence of two characters - and n.
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Ques 9

Would you initialize your strings with single quotes or double quotes?

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.
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Ques 11

I want to combine two variables together:

 $var1 = 'Welcome to '; $var2 = 'TechInterviews.com';
What will work faster? Code sample 1: - 
$var 3 = $var1.$var2;
Or code sample 2:
$var3 = "$var1$var2";
Both examples would provide the same result - $var3 equal to "Welcome to TechInterviews.com". However, Code Sample 1 will work significantly faster. Try it out with large sets of data (or via concatenating small sets a million times or so), and you will see that concatenation works significantly faster than variable substitution.
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Ques 12

For printing out strings, there are echo, print and printf. Explain the differences.

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:
 <?php echo 'Welcome ', 'to', ' ', 'TechInterviews!'; ?>
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.
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PHP vs JSPPHP vs JSP

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