Difference between var_dump,var_export & print_r

1) var_dump ==>> is for debugging purposes

// var_dump(array('', false, 42, array('42')));
array(4) {
  [0]=> string(0) ""
  [1]=> bool(false)
  [2]=> int(42)
  [3]=> array(1) {[0]=>string(2) "42")}
}

2) print_r =>> is for for debugging purposes, too, but does not include the member's type. It's a good idea to use if you know the types of elements in your array, but can be misleading otherwise:

Array (
    [0] =>
    [1] =>
    [2] => 42
    [3] => Array ([0] => 42)
)

3) Var_export ==>  prints valid php code. Useful if you calculated some values and want the results as a constant in another script. Note that var_export can not handle reference cycles/recursive arrays, whereas var_dump and print_r check for these.

array (
  0 => '',
  2 => false,
  2 => 42,
  3 => array (0 => '42',),
)

Personally, I think var_export is the best compromise of concise and precise.



Note ======================================================================>>  IMP.

Echo :

It is statement not a function No return value

Not Required the parentheses

Not Print Array

Print

It is real function

Return type 1

Required the Parentheses

Not Print Array

Print_r

Print in human readable format

String not in Quotes

Not Detail Information of Variable like type and all

var_dump

All dump information of variable like type of element and sub element