So if md5( ) generates the most secure hash, why would you ever use the less secure crc32( ) and sha1( )?
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
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1. What?s the difference between accessing a class method via -> and via ::?
Correct Answer: User defined functions can be created into the Microsoft spreadsheet Spreadsheets can be customized according to the user needs by using VB applications To create visual basic functions useful for spreadsheet you need to click Tools and select Macros where you will need to click on Visual basic editor
5. What are the rules which should be followed while naming a variable in VB?
Correct Answer: Some of the rules which should be followed while naming a variable in VB are as follows: 1) Characters should be less than 255 2) Space between characters should be allowed 3) A variable should begin with a number 4) Period may not be permitted
6. Would I use print "$a dollars" or "{$a} dollars" to print out the amount of dollars in this example?
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
7. How do I find out the number of parameters passed into function?