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Q:

What is the most important feature of Java?

Answer Java is a platform independent language.
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Subject: Java

Q:

Are objects passed by value or by reference?

Answer Everything is passed by value.
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Subject: PHP

Q:

How do you pass a variable by value?

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

Q:

If the variable $a is equal to 5 and variable $b is equal to character a, what’s the value of $$b?

Answer 100, it’s a reference to existing variable.
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Subject: PHP

Q:

I am trying to assign a variable the value of 0123, but it keeps coming up with a different number, what’s the problem?

Answer PHP Interpreter treats numbers beginning with 0 as octal. Look at the similar PHP interview questions for more numeric problems.
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Subject: PHP

Q:

So if md5( ) generates the most secure hash, why would you ever use the less secure crc32( ) and sha1( )?

Answer Crypto usage in PHP is simple, but that doesn’t mean it’s free. First off, depending on the data that you’re encrypting, you might have reasons to store a 32-bit value in the database instead of the 160-bit value to save on space. Second, the more secure the crypto is, the longer is the computation time to deliver the hash value. A high volume site might be significantly slowed down, if frequent md5() generation is required.
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Subject: PHP

Q:

With a heredoc syntax, do I get variable substitution inside the heredoc contents?

Answer Yes
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Subject: PHP

Q:

What’s the difference between accessing a class method via -> and via ::?

Answer :: is allowed to access methods that can perform static operations, i.e. those, which do not require object initialization.
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Subject: PHP