从列表中找出最长单词的长度

Question

列表如下：

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

我想像这样缩进所有单词：

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

（或至少第一列）

我已经设法使用数组和str_pad：

$lines = explode("\n", $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 .= "\n";
}

但是由于文本非常大，它使用了相当多的内存。有没有其他方法可以做到这一点，而无需将文本拆分为数组？

Answer 1

如果文件非常大，您可以逐行读取文件，而不是将其全部加载到 使用file() 一次数组。

$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);

这一次加载一行，一次写入一行。应该使用更少的内存。