How do you pass a variable by value?

Correct Answer: Via define() directive, like define ("MYCONSTANT", 100);

Correct 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

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

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

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

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

Correct Answer: Everything is passed by value

Correct Answer: parent::constructor($value)

Correct 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

Correct Answer: - echo is the most primitive of them, and just outputs the contents following the construct to the screen print is also a construct (so parentheses are optional when calling it), but it returns TRUE on successful output and FALSE if it was unable to print out the string However, you can pass multiple parameters to echo, like: and it will output the string "Welcome to TechInterviews!" print does not take multiple parameters It is also generally argued that echo is faster, but usually the speed advantage is negligible, and might not be there for future versions of PHP printf is a function, not a construct, and allows such advantages as formatted output, but it?s the slowest way to print out data out of echo, print and printf