Question

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Strange behavior Of foreach
Strange behaviour after loop by reference – Is this a PHP bug?

I do have a problem with Foreach, I can’t understand the second foreach.

why the third part of $foo array has ‘two’ in its value!

In as much as we know, if we remove the ‘&'(in first foreach) the problem will solve, but why?

<?php

$foo = array('one', 'two', 'three');

foreach ($foo as &$bar)
{
// no-op
}

var_dump($foo);

foreach ($foo as $bar)
{
 // no-op
}

var_dump($foo);
?>
###############################################

produces:

 array(3) {
   [0]=>string(3) "one"
   [1]=>string(3) "two"
   [2]=>&string(5) "three"
  }
   array(3) {
  [0]=>string(3) "one"
  [1]=>string(3) "two"
  [2]=>&string(3) "two"
  } 

Answer 1

From the docs:

Reference of a $value and the last array element remain even after the foreach loop. It is recommended to destroy it by unset().

So in your case:

<?php

$foo = array('one', 'two', 'three');

foreach ($foo as &$bar)
{
    // no-op
}

var_dump($foo);

unset($bar);

foreach ($foo as $bar)
{
 // no-op
}

var_dump($foo);
?>