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Q:

What is the difference between a JDK and a JVM?

Answer

JDK is Java Development Kit which is for development purpose and it includes execution environment also.


JVM is Java Virtual Machine which is a run time environment for the compiled java class files .Hence you will not be able to compile your source files using a JVM.

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Subject: Java

Q:

What’s the difference between htmlentities( ) and htmlspecialchars( )?

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.
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Subject: PHP

Q:

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

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.
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Subject: PHP

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:

What’s the difference between include and require?

Answer It’s how they handle failures. If the file is not found by require(), it will cause a fatal error and halt the execution of the script. If the file is not found by include(), a warning will be issued, but execution will continue.
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Subject: PHP

Q:

What’s the difference between md5( ), crc32( ) and sha1( ) crypto on PHP?

Answer The major difference is the length of the hash generated. CRC32 is, evidently, 32 bits, while sha1() returns a 128 bit value, and md5() returns a 160 bit value. This is important when avoiding collisions.
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Subject: PHP

Q:

What is the difference between characters 23 and x23?

Answer The first one is octal 23, the second is hex 23
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Subject: PHP