在 PHP 中替换文件内容
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Replacing file content in PHP
提问by Emanuil Rusev
I need a function just like preg_replacebut instead of strings I need it to work with files / file content.
我需要一个类似于preg_replace的函数，但我需要它来处理文件/文件内容而不是字符串。
回答by codaddict
You can do:
你可以做：
$file = 'filename';
file_put_contents($file,str_replace('find','replace',file_get_contents($file)));
回答by ircmaxell
@codaddict's answer is quite sufficent for small files (and would be how I would implement it if the size of the file was under a MiB). However it will eat up a ton of memory, and as such you should be careful when reading large files.
@codacci 的答案对于小文件来说已经足够了（如果文件的大小在 MiB 以下，我将如何实现它）。但是它会占用大量内存，因此在读取大文件时应该小心。
If you want a much more memory friendly version, you could use stream filters...
如果你想要一个更内存友好的版本，你可以使用流过滤器......
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');
So, then you can append an arbitrary stream filter. The filter's name determines the arguments:
因此，您可以附加任意流过滤器。过滤器的名称决定了参数：
$search = 'foo';
$replace = 'bar';
$name = 'replacetext.'.$search.'|'.$replace;
stream_filter_append($stream, $name);
or for arrays,
或者对于数组，
$search = array('foo', 'bar');
$replace = array('bar', 'baz');
$name = 'replacetext.'.implode(',', $search).'|'.implode(',', $replace);
stream_filter_append($stream, $name);
Obviously this is a really simple example (and doesn't do a lot of error checking), but it allows you to do something like this:
显然这是一个非常简单的例子（并且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');
And that will keep memory usage very low while processing potentially huge (GiB or TiB) files...
这将使内存使用量非常低，同时处理潜在的巨大（GiB 或 TiB）文件......
Oh, and the other cool thing, is it can inline edit differing stream types. What I mean by that is that you can read from a HTTP stream, edit inline, and write to a file stream. It's quite powerful (as you can chain these filters)...
哦，另一个很酷的事情是它可以内联编辑不同的流类型。我的意思是您可以从 HTTP 流中读取、内联编辑和写入文件流。它非常强大（因为您可以链接这些过滤器）...
回答by DarkReverser
<?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!");
}
?>
