如何打开文件并删除最后一行? [英] How to open a file and remove the last line?

问题描述

我想打开一个文件，抓住文件的最后一行，其中line =?>"，这是php文档的结束标记.比我想在其中添加数据并在最后一行添加?>".

I am looking to open up a file, grab the last line in the file where the line = "?>", which is the closing tag for a php document. Than I am wanting to append data into it and add back in the "?>" to the very last line.

我一直在尝试一些方法，但是我没有运气.

I've been trying a few approaches, but I'm not having any luck.

这是我到目前为止从zip文件中读取的内容.尽管我知道这全都错了，但是请对此有所帮助...

Here's what I got so far, as I am reading from a zip file. Though I know this is all wrong, just needing some help with this please...

// Open for reading is all we can do with zips and is all we need.
if (zip_entry_open($zipOpen, $zipFile, "r"))
{
    $fstream = zip_entry_read($zipFile, zip_entry_filesize($zipFile));
    // Strip out any php tags from here.  A Bit weak, but we can improve this later.
    $fstream = str_replace(array('?>', '<?php', '<?'), '', $fstream) . '?>';

    $fp = fopen($curr_lang_file, 'r+');

    while (!feof($fp))
    {
        $output = fgets($fp, 16384);
        if (trim($output) == '?>')
            break;
    }

    fclose($fp);
    file_put_contents($curr_lang_file, $fstream, FILE_APPEND);
}

$curr_lang_file是实际文件的文件路径字符串，需要在其上附加fstream，但是在删除了最后一行等于'?>'

$curr_lang_file is a filepath string to the actual file that needs to have the fstream appended to it, but after we remove the last line that equals '?>'

好吧，我实际上进行了一些更改，并且似乎可以正常工作，但是现在它在其中复制了两次数据... arggg，所以文件中的每一行现在都在其中2次了:(

Ok, I actually made a few changes, and it seems to work, BUT it now copies the data in there twice... arggg, so each line in the file is now in there 2 times :(

好吧，删除了fwrite，尽管现在它是将它附加在底部，即?>的正下方.

Ok, removed the fwrite, though now it is appending it at the bottom, just below the ?>

OMG，我只需要最后一行的所有内容，没有办法做到这一点吗???我不需要?>"

OMG, I just need everything up to the last line, isn't there a way to do this??? I don't need "?>"

推荐答案

在文件系统上处理文件的简单方法:

A simple way with the file on the filesystem:

<?php

$path = "file.txt";
$content = file($path); // Parse file into an array by newline
$data = array_pop($content);

if (trim($data) == '?>') {
    $content[] = 'echo "... again";';
    $content[] = "\n$data";
    file_put_contents($path, implode($content));
}

是哪个.

$ cat file.txt 
<?php
echo 'Hello world';
?>
$ php test.php 
$ cat file.txt 
<?php
echo 'Hello world';
echo "... again";
?>

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