替换长度为40或更长的字符串中的单词

Question

我有以下代码：

$caption = $picture->getCaption();
$words = explode(" ", $caption);
foreach ($words as $word) {
    $string_length = strlen($word);
    if ($string_length > 40) {
        str_replace($word, '', $caption);
        $picture->setCaption($caption);
    }
}

但是，为什么不删除修剪后的字词来替换字幕？

Answer 1

您需要指定替换品：

$caption = str_replace($word, '', $caption);

我认为这要好得多：

$caption = $picture->getCaption();
// explode them by spaces, filter it out
// get all elements thats just inside 40 char limit
// them put them back together again with implode
$caption = implode(' ', array_filter(explode(' ', $caption), function($piece){
    return mb_strlen($piece) <= 40;
}));
$picture->setCaption($caption);

Answer 2

你需要这样做：

$caption = $picture->getCaption();
$words = explode(" ", $caption);
foreach ($words as $word)
{
  $string_length = strlen($word);
  if ($string_length > 40) {
       $picture->setCaption(str_replace($word, '', $caption));
   }
}

Answer 3

你必须这样做：

$caption = $picture->getCaption();
$words = explode(" ", $caption);
foreach ($words as $word)
{
  $string_length = strlen($word);
  if ($string_length > 40) {
      $replaced = str_replace($word, '', $caption);
      $picture->setCaption($replaced);
  }
}