Group a section of elements in an array together.

custom-sort.php

$start_section = array();
$my_section = array();

$end_section = array();
$started = false;
foreach ($arr as $item) {
  if (strpos($item, '?param=my_val') !== false) {
		$my_section[] = $item;
		$started = true;
	} else {
		if(!$started) {
			$start_section[] = $item;
		} else {
			$end_section[] = $item;
		}
	}
}
		
$arr = array_merge($start_section, $my_section, $end_section);