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PHP Interview Questions and Answers

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PHP vs JSP

Ques 1. When are you supposed to use endif to end the conditional statement?

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

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Ques 2. Explain the ternary conditional operator in PHP?

Expression preceding the ? is evaluated, if it's true, then the expression preceding the : is executed, otherwise, the expression following : is executed.
E.g $id = isset($_GET['id']) ? $_GET['id'] : false;

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Ques 3. How do I find out the number of parameters passed into function?

func_num_args() function returns the number of parameters passed in.

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Ques 4. If the variable $a is equal to 5 and variable $b is equal to character a, what's the value of $$b?

100, it's a reference to existing variable.

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Ques 5. What's the difference between accessing a class method via -> and via ::?

:: is allowed to access methods that can perform static operations, i.e. those, which do not require object initialization.

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