Description:
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1) declare an array
2) use this array as return from a function
3) fill this array manually with values
4) implode the array
The first and second item are swapped in the result string

Test script:
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$tab_ret = array();
$tab_ret = myfunction($param);
$data1 = $tab_ret[0];
$data2 = $tab_ret[1];

$tab_ret[0] = "Marcus";
$tab_ret[1] = "John";
$tab_ret[2] = "Peter";
$tab_ret[3] = "Paul";	
$tab_ret[4] = "Ringo";	
$str = implode("-",$tab_ret);
// Result string is John-Marcus-Peter-Paul-Ringo
If rather than using $tab_ret as return from the function you use another array, that's OK.