Description:
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The code is very simple and speaks for itself.

Test script:
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<?php
$data = array(array('name' => 'Lucas', 'surname' => 'Barrena'));

foreach($data as &$row) {} #here, with reference
#unset($row); #this line, fix everything

$copy = $data;

print_r($copy);

#set, method A
$data = array(array('name' => 'Lcs'));

#method A-1: works
#without foreach

#method A-2: fails
foreach($data as $row) {}

#method B, fails
#$data[0]['name'] = 'Lcs';
#without foreach

print '<br>';
print_r($copy); #now copy it's different with methods fails

Expected result:
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$copy should not be different.