echo '<br />TAB1<br />';
 
 $tab[] = '123';
 $tab[] = '456';
 $tab[] = '789';
 $tab[] = 'abc';
 
 print_r($tab);
 echo '<br />';
 echo count($tab).' elements<br />-----<br />';
   
 foreach($tab as $tab_index => $tab_element);
 {
  echo $tab_index.' '.$tab_element.'<br />';
 }
 
 
 echo '<br />TAB2<br />';
 
 $tab2 = array('123', '456','789','abc');
 print_r($tab2);
 echo '<br />';
 echo count($tab2).' elements<br />-----<br />';
 
 foreach($tab2 as $tab_index => $tab_element);
 {
  echo $tab_index.' '.$tab_element.'<br />';
 }
 
 
 echo '<br />TAB3<br />';
 
 $tab3 = split(',', '123,456,789,abc');
 print_r($tab3);
 echo '<br />';
 echo count($tab3).' elements<br />-----<br />';
   
 foreach($tab3 as $tab_index => $tab_element);
 {
  echo $tab_index.' '.$tab_element.'<br />';
 }
 
 
 echo '<br />TAB4<br />';
 
 $tab4 = split(',', '123,456,789,abc');
 print_r($tab4);
 echo '<br />';
 echo count($tab4).' elements<br />-----<br />';
   
 for($tab_index=0; $tab_index < count($tab4); $tab_index++)
 {
  $tab_element=$tab4[$tab_index];
  echo $tab_index.' '.$tab_element.'<br />';
 }

TAB1
Array ( [0] => 123 [1] => 456 [2] => 789 [3] => abc )  
4 elements
-----
3 abc
 
TAB2
Array ( [0] => 123 [1] => 456 [2] => 789 [3] => abc )  
4 elements
-----
3 abc
 
TAB3
Array ( [0] => 123 [1] => 456 [2] => 789 [3] => abc )  
4 elements
-----
3 abc
 
TAB4
Array ( [0] => 123 [1] => 456 [2] => 789 [3] => abc )  
4 elements
-----
0 123
1 456
2 789
3 abc