PHP has lambda function! :D

I just discovered that you can perform lambda function with PHP tonight! Here's how to do it:

# First, go to php console  (you will need to install HipHop)

php -a


Welcome to HipHop Debugger!
Type "help" or "?" for a complete list of commands.

Note: no server specified, debugging local scripts only.
If you want to connect to a server, launch with "-h" or use:
  [m]achine [c]onnect <servername>

hphpd> 

# mapper function in PHP is called "array_map", it takes in a function and an array, just like Python:
$result = array_map( $a==> $a+1, [1,2,3,4])

$a ==> $a+1    is a lambda function, where $a is each element in the array. The function simply takes the value and plus one. the $result is expected to have [2,3,4,5]

$result will be another array of numbers.

To get an array of values from the $result variable, we need to do something similar to .to_a method in Ruby:

var_dump($result)

array(4) {
  [0]=>
  int(2)
  [1]=>
  int(3)
  [2]=>
  int(4)
  [3]=>
  int(5)

}

The result is as expected.