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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:

Explain the ternary conditional operator in PHP?

Answer Expression preceding the ? is evaluated, if it’s true, then the expression preceding the : is executed, otherwise, the expression following : is executed.
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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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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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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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Q:

What’s the special meaning of __sleep and __wakeup?

Answer __sleep returns the array of all the variables than need to be saved, while __wakeup retrieves them.
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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