第一个任务解决方案代

function split_repeating($string)

{

$words = explode(' ', $string);

$words_count = count($words);

$need_remove = array();

for ($i = 0; $i < $words_count; $i++) {

$need_remove[$i] = false;

}

// Here I iterate through the number of words that will be repeated and check all the possible positions reps

for ($i = round($words_count / 2); $i >= 1; $i--) {

for ($j = 0; $j < ($words_count - $i); $j++) {

$need_remove_item = !$need_remove[$j];

for ($k = $j; $k < ($j + $i); $k++) {

if ($words[$k] != $words[$k + $i]) {

$need_remove_item = false;

break;

}

}

if ($need_remove_item) {

for ($k = $j; $k < ($j + $i); $k++) {

$need_remove[$k] = true;

}

}

}

}

$result_string = '';

for ($i = 0; $i < $words_count; $i++) {

if (!$need_remove[$i]) {

$result_string .= ' ' . $words[$i];

}

}

return trim($result_string);

}

$string = 'Lorem ipsum dolor sit amet sit amet sit amet sit nostrud exercitation amit sit ullamco laboris nisi ut aliquip ex ea commodo consequat.';

echo $string . '
';

echo split_repeating($string) . '
';

echo 'Lorem ipsum dolor sit amet sit nostrud exercitation amit sit ullamco laboris nisi ut aliquip ex ea commodo consequat.' . '
' . '
';

$string = 'Lorem ipsum dolor sit amet () sit amet () sit amet () sit nostrud exercitation ullamco laboris nisi ut aliquip aliquip ex ea commodo consequat.';

echo $string . '
';

echo split_repeating($string) . '
';

echo 'Lorem ipsum dolor sit amet () sit nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.';

?>

第二任务解决方案代码

function split_repeating($string)

{

$words = explode(' ', $string);

$words_count = count($words);

$need_remove = array();

for ($i = 0; $i < $words_count; $i++) {

$need_remove[$i] = false;

}

for ($j = 0; $j < ($words_count - 1); $j++) {

$need_remove_item = !$need_remove[$j];

for ($k = $j + 1; $k < ($words_count - 1); $k += 2) {

if ($words[$k] != $words[$k + 2]) {

$need_remove_item = false;

break;

}

}

if ($need_remove_item) {

for ($k = $j + 2; $k < $words_count; $k++) {

$need_remove[$k] = true;

}

}

}

$result_string = '';

for ($i = 0; $i < $words_count; $i++) {

if (!$need_remove[$i]) {

$result_string .= ' ' . $words[$i];

}

}

return trim($result_string);

}

$string = '2 questions 3 questions 4 questions 5 questions';

echo $string . '
';

echo split_repeating($string) . '
';

echo '2 questions';

?>