PHP: Wie kann ich alle möglichen Sequenzen beliebiger Länge innerhalb einer Zeichenkette finden?

Question

Ich möchte eine Benutzereingabe (String) nehmen und sie in eine Liste von Wortkombinationen (Array) aller möglichen Längen umwandeln, aber nur die Kombinationen behalten, die in der Reihenfolge sind.

$newArray = ["this","string","will","be","chopped","up","this string","will be","be chopped","chopped up","this string will","string will be","be chopped up"];

Mein Code (nicht funktioniert) wird wie folgt:

Also das Array in der unten würde schließlich lesen PHP aufgeführt

PHP

$str = "This string will be chopped up."; 
$str = strtolower($str); 
$strSafe = preg_replace("/[^0-9a-z\s-_]/i","",$str); 
$array = explode(" ", $strSafe); 
$newArray = []; 
$newArrayEntry = []; 

for($counter=0; $counter < COUNT($oneword); $counter++) { 

    // List single words - as in array $oneword. 
    echo "One word: "; 
    echo $oneword[$counter]; 
    echo "<br />"; 

    $counterTwo = $counter+1;  

    if($counterTwo <= COUNT($oneword)) { 
     $newArrayEntry[COUNT($newArrayEntry)] = $oneword[$counter]; 
     print "Adding counter One to newArray Entry: ".$oneword[$counter]."<br />"; 
     for($counterThree=($counter+1); $counterThree < $counterTwo; $counterThree++) { 
      $newArrayEntry[COUNT($newArrayEntry)] = $oneword[$counterThree]; 

      if($counterThree - $counterTwo == 1) { 
       $newArrayEntry[COUNT($newArrayEntry)] = $oneword[$counterTwo]; 
       print "Adding counter Two to newArrayEntry: ".$oneword[$counterTwo]."<br />"; 
      } 
     } 
     $newArrayString = join(' ', $newArrayEntry); 
     $newArray[COUNT($newArray)] = $newArrayString; 
    } 
} 

Answer 1

Sie könnte diesen Code verwenden:

$str = "This string will be chopped up."; 
$str = strtolower($str); 
$strSafe = preg_replace("/[^0-9a-z\s-_]/i","",$str); 
$array = explode(" ", $strSafe); 
$newArray = []; 

for ($len = 1; $len <= count($array); $len++) { 
    for($start = 0; $start+$len <= count($array); $start++) { 
     $newArray[] = implode(" ", array_slice($array, $start, $len)); 
    } 
} 


var_export($newArray); 

Ausgang:

array (
    0 => 'this', 
    1 => 'string', 
    2 => 'will', 
    3 => 'be', 
    4 => 'chopped', 
    5 => 'up', 
    6 => 'this string', 
    7 => 'string will', 
    8 => 'will be', 
    9 => 'be chopped', 
    10 => 'chopped up', 
    11 => 'this string will', 
    12 => 'string will be', 
    13 => 'will be chopped', 
    14 => 'be chopped up', 
    15 => 'this string will be', 
    16 => 'string will be chopped', 
    17 => 'will be chopped up', 
    18 => 'this string will be chopped', 
    19 => 'string will be chopped up', 
    20 => 'this string will be chopped up', 
)