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PHP Interview Question
By Coding Tag
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In this presentation you will learn about latest
frequently asked Interview questions related to
PHP.
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What is the purpose of constant() function?

• According to the name, this function return the
  value of the constant. but you dont know its
  name, i.e. It is stored in a variable or returned
  by a function.
• lt?php
• define("MINSIZE", 50)
• echo MINSIZE
• echo constant("MINSIZE") // same as the previous
  statement
• ?gt

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What is NULL?

• NULL is a one special type with one and only
  value stored in it is NULL.It is a special
  constant that is capitalized by convention, but
  actually it is case insensitive .
• my_var null
• Variable assigned NULL has the following
  properties-
• It evaluates to FALSE in a Boolean context.
• It returns FALSE when tested with IsSet()
  function.

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Explain the syntax for foreach loop.

• The foreach loop statement is used to loop in
  arrays values ,for each value of the current
  array element is assigned to value and the array
  pointer move one by one .So after that next
  element is allowed to process.

foreach (array as value) code to be
executed
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How to concatenate to strings?

• To concatenate two string variables together, use
  the dot (.) operator.
• lt?php
• string1"Hello World"
• string2"444"
• echo string1 . " " . string2
• ?gt
• This will produce following result -
• Hello World 444

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