What does a special set of tags do in PHP?

Correct Answer: func_num_args() function returns the number of parameters passed in

Correct Answer: 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

Correct 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

Correct Answer: :: is allowed to access methods that can perform static operations, ie those, which do not require object initialization

Correct Answer: When the original if was followed by : and then the code block without braces

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

Correct Answer: 100, it?s a reference to existing variable

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

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

Correct 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