Arrays
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<?
/*************************************************************************
* array_rm_dupes routine v.1.00
* Language: PHP4
* Author: Vadim Bodrov (falkoris@hotmail.com)
* Date: 2 April 2002
*
* Description:
* array array_rm_dupes(array array, [boolean is_sorted])
*
* array_rm_dupes() removes duplicate values from an array. It takes
* input array and returns a new array without duplicate values.
* array_rm_dupes() sorts the input array in case if is_sorted flag is
* "false" (default). Two elements are considered equal if and only if
* (string) $elem1 === (string) $elem2
*
* NOTE THAT UNLIKE THE STANDARD array_unique() FUNCTION KEYS ARE
* PRESERVED!
*************************************************************************/
function array_rm_dupes($arg_array, $is_sorted = false)
{
if (!$is_sorted)
sort($arg_array);
if (count($arg_array) > 1)
{
$res = array($last = $arg_array[0]);
for ($i = 1; $i < count($arg_array); $i++)
{
if (!((string) $arg_array[$i] === (string) $last))
{
array_push($res, $arg_array[$i]);
$last = $arg_array[$i];
}
}
return $res;
} else
return $arg_array;
}
?>
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Usage Example
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<?
$a = array ("green", "blue", "blue", "white", "yellow", "green", "magenta");
sort($a);
echo "<b>Initial array:</b><br>";
for ($i = 0; $i < count($a); $i++)
echo "[$a[$i]] ";
$a = array_rm_dupes($a);
echo "<br><br><b>Processed array:</b><br>";
for ($i = 0; $i < count($a); $i++)
echo "[$a[$i]] ";
?>
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