PHP删除特定字符后的所有空格

Question

我有一个看起来像这样的文本文件：

What word is on page 9, 4 words from the left on line 15?   account
What word is on page 11, 2 words from the left on line 5?   always

有没有办法可以删除“？”之后的所有空格所以它看起来像这样（整个实际文本文件中的空间量都是不同的）：

What word is on page 9, 4 words from the left on line 15?account
What word is on page 11, 2 words from the left on line 5?always

Answer 1

使用正则表达式：

$str = 'What word is on page 9, 4 words from the left on line 15?   account';
echo preg_replace('/\?\s+/', '?', $str);

Answer 2

$input = 'What word is on page 9, 4 words from the left on line 15?   account';
echo preg_replace('/\?\s+/', '?', $input);

See it in action