Question

我需要一个像preg_replace这样的函数，但我需要它来处理文件/文件内容而不是字符串。

Answer 1

你可以这样做：

$file = 'filename';
file_put_contents($file,str_replace('find','replace',file_get_contents($file)));

Answer 2

@ codaddict的答案对于小文件来说是非常充分的（如果文件的大小在MiB下，我将如何实现它）。但是它会占用大量内存，因此在阅读大文件时应该小心。

如果您想要更友好的内存版本，可以使用stream filters ...

class ReplaceText_filter extends php_user_filter {
    protected $search = '';
    protected $replace = '';

    public function filter($in, $out, &$consumed, $closing) {
        while ($bucket = stream_bucket_make_writable($in)) {
            $bucket->data = str_replace(
                $this->search, 
                $this->replace, 
                $bucket->data
            );
            $consumed += $bucket->datalen;
            stream_bucket_append($out, $bucket);
        }
        return PSFS_PASS_ON;
    }

    public function onCreate() {
        if (strpos($this->filtername, '.') === false) return false;
        list ($name, $arguments) = explode('.', $this->filtername, 2);
        $replace = '';
        $search = $arguments;
        if (strpos($arguments, '|') !== false) {
            list ($search, $replace) = explode('|', $arguments, 2);
        }
        if (strpos($search, ',') !== false) {
            $search = explode(',', $search);
        }
        if (strpos($replace, ',') !== false) {
            $search = explode(',', $replace);
        }
        $this->search = $search;
        $this->replace = $replace;
    }
}
stream_filter_register('replacetext.*', 'ReplaceText_Filter');

那么，您可以附加任意流过滤器。过滤器的名称确定参数：

$search = 'foo';
$replace = 'bar';
$name = 'replacetext.'.$search.'|'.$replace;
stream_filter_append($stream, $name);

或数组，

$search = array('foo', 'bar');
$replace = array('bar', 'baz');
$name = 'replacetext.'.implode(',', $search).'|'.implode(',', $replace);
stream_filter_append($stream, $name);

显然这是一个非常简单的例子（并没有做很多错误检查），但它允许你做这样的事情：

$f1 = fopen('mysourcefile', 'r');
$f2 = fopen('mytmpfile', 'w');
$search = array('foo', 'bar');
$replace = array('bar', 'baz');
$name = 'replacetext.'.implode(',', $search).'|'.implode(',', $replace);
stream_filter_append($f1, $name);
stream_copy_to_stream($f1, $f2);
fclose($f1);
fclose($f2);
rename('mytmpfile', 'mysourcefile');

这会在处理潜在巨大的（GiB或TiB）文件时保持内存使用率非常低......

哦，另一个很酷的事情是，它可以内联编辑不同的流类型。我的意思是你可以从HTTP流中读取，编辑内联，并写入文件流。它非常强大（因为你可以链接这些过滤器）......

Answer 3

<?php

$pattern = "/created/";
$replacement = "XXXXX";
$file_name = "regex.txt";
$getting_file_contents = file_get_contents($file_name);

echo("Original file contents : " . "<br><br>");
var_dump($getting_file_contents);
echo("<br><br><br>");

if ($getting_file_contents == true) {
  echo($file_name . " had been read succesfully" . "<br><br><br>");

  $replace_data_in_file = preg_replace($pattern, $replacement, $getting_file_contents);
  $writing_replaced_data = file_put_contents($file_name, $replace_data_in_file);
  echo("New file contents : " . "<br><br>");
  var_dump($replace_data_in_file);
  echo("<br><br>");

  if ($writing_replaced_data == true) {
    echo("Data in the file changed");
  }
  else {
    exit("Cannot change data in the file");
  }
}
else {
  exit("Unable to get file contents!");
}

?>

用PHP替换文件内容

3 个答案: