20+ Top Interview Questions and Answers (2024)

Ques 1

What does a special set of tags <?= and ?> do in PHP?

The output is displayed directly to the browser.

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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 3

How do you define a constant?

Via define() directive, like define ("MYCONSTANT", 100);

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Ques 4

How do you pass a variable by value?

Just like in C++, put an ampersand in front of it, like $a = &$b

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Ques 5

When are you supposed to use endif to end the conditional statement?

When the original if was followed by : and then the code block without 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 7

How do you call a constructor for a parent class?

parent::constructor($value)

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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 10

What is the difference between characters 23 and x23?

The first one is octal 23, the second is hex 23.

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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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Freshers / Beginner level questions & answers

What does a special set of tags <?= and ?> do in PHP?

Simpan untuk Revisi

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

Simpan untuk Revisi

How do you define a constant?

Simpan untuk Revisi

How do you pass a variable by value?

Simpan untuk Revisi

When are you supposed to use endif to end the conditional statement?

Simpan untuk Revisi

Explain the ternary conditional operator in PHP?

Simpan untuk Revisi

How do you call a constructor for a parent class?

Simpan untuk Revisi

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

Simpan untuk Revisi

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

Simpan untuk Revisi

What is the difference between characters 23 and x23?

Simpan untuk Revisi

I want to combine two variables together:

Simpan untuk Revisi

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

Simpan untuk Revisi

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WithoutBook

Bangun keterampilan dengan jalur belajar terfokus, tes simulasi, dan konten siap wawancara.

Interview Questions and Answers

The Best LIVE Mock Interview - You should go through before interview

Interview Questions and Answers

Freshers / Beginner level questions & answers

What does a special set of tags <?= and ?> do in PHP?

Simpan untuk Revisi

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

Simpan untuk Revisi

How do you define a constant?

Simpan untuk Revisi

How do you pass a variable by value?

Simpan untuk Revisi

When are you supposed to use endif to end the conditional statement?

Simpan untuk Revisi

Explain the ternary conditional operator in PHP?

Simpan untuk Revisi

How do you call a constructor for a parent class?

Simpan untuk Revisi

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

Simpan untuk Revisi

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

Simpan untuk Revisi

What is the difference between characters 23 and x23?

Simpan untuk Revisi

I want to combine two variables together:

Simpan untuk Revisi

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

Simpan untuk Revisi

Most helpful rated by users:

Perbedaan terkait

Related interview subjects

All interview subjects

WithoutBook

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