找出列表中最长单词的长度

Question

The list looks like:

Lorem ipsum dolor sit amet,
consectetur adipisicing elit,
sed do eiusmod tempor
...

I want to indent all words like this:

Lorem       ipsum       dolor   sit    amet,
consectetur adipisicing elit,
sed         do          eiusmod tempor

(or at least the first column)

I've managed to do this using arrays and str_pad:

$lines = explode("
", $text);
$counts = array();

foreach($lines as $line){
  $words = explode(' ', $line);
  foreach($words as $index => $word){
    if(!isset($counts[$index]) || $counts[$index] < strlen($word))
      $counts[$index] = strlen($word);
  }
}

$text = '';

foreach($lines as $line){
  $words = explode(' ', $line);
  foreach($words as $index => $word)
    $text .= str_pad($word, $counts[$index], ' ' , STR_PAD_RIGHT) . ' ';

  $text .= "
";
}

but because the text is very large it uses quite a lot of memory. Is there any other way I can do this, without splitting the text in arrays?

Answer 1

If the file is extremely large, you could read the file line by line instead of loading it all into an array at once with file().

$fh = fopen("alice.txt", "r");
$fh = fopen("yourfile.txt", "r");

while( !feof($fh) ){

    $line = fgets($fh);
    $Newerline = str_replace("-", " ", $line);

    $textArray = str_word_count($Newerline,1); 

    //now go through the line word by word
    foreach ($textArray as $index => $word){
        trim($word);
        $wordLength = mb_strlen($word);

        //is this word the longest for this column?
        if($wordLength > $longWords[$index]['longestWordlen'] ){
            $longWords[$index]['longestWordlen'] = $wordLength;
            $longWords[$index]['longestWord'] = $word;
        }

    }
    //echo $line;
}
//rewind the file pointer to the beginning
rewind($fh);

ksort($longWords);//associative array will be out of order since longest word shows up differently

//now create a new file to hold the new version
$fileh = fopen( "newFile.txt", "c");

while( !feof($fh) ){
    $line = fgets($fh);
    $Newerline = str_replace("-", " ", $line); 

    $textArray = str_word_count($Newerline,1); 

    $newLine =  "";
    //now go through the line word by word
    foreach ($textArray as $index => $word){
        //set the length of this words column
            $pad_length = $longWords[$index]['longestWordlen'];

            $newLine .= str_pad($word, $pad_length + 1, " ", STR_PAD_RIGHT);

    }
    $newLine .= PHP_EOL;

    //save the newLine to file
    fwrite($fileh, $newLine);

    //echo $newLine;
}

fclose($fileh);
fclose($fh);

This loads one line at a time and writes one line at a time. Should use less memory.