How to Explode String Right to Left?

Question

$split_point = \' - \';
$string = \'this is my - string - and more\';

How can i make a split using the second instance of $split_point and not the

Answer 1

Just an idea:

function explode_reversed($delim,$s){
  $result = array();
  $w = "";
  $l = 0;
  for ($i = strlen($s)-1; $i>=0; $i-- ):
    if ( $s[$i] == "$delim" ):
      $l++;
      $w = "";
    else:
      $w = $s[$i].$w;
    endif;
    $result[$l] = $w;
  endfor;
return $result;
}
$arr = explode_reversed(" ","Hello! My name is John.");
print_r($arr);

Result:

Array
(
    [0] => John.
    [1] => is
    [2] => name
    [3] => My
    [4] => Hello!
)

But this is much slower then explode. A test made:

$start_time = microtime(true);
for ($i=0; $i<1000;$i++)   
  $arr = explode_reversed(" ","Hello! My name is John.");
$time_elapsed_secs = microtime(true) - $start_time;
echo "time: $time_elapsed_secs s
";

Takes 0.0625 - 0.078125s

But

for ($i=0; $i<1000;$i++)   
  $arr = explode(" ","Hello! My name is John.");

Takes just 0.015625s

The fastest solution seems to be:

array_reverse(explode($your_delimiter, $your_string));

In a loop of 1000 times this is the best time I can get 0.03125s.