使用 PHP 替换文本文件中的字符串
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Replace string in text file using PHP
提问by user1037871
I need to open a text file and replace a string. I need this
我需要打开一个文本文件并替换一个字符串。我需要这个
Old String: <span id="$msgid" style="display: block;">
New String: <span id="$msgid" style="display: none;">
This is what I have so far, but I don't see any changes in the text file besides extra white spaces.
这是我到目前为止所拥有的，但除了额外的空格之外，我没有看到文本文件中有任何变化。
$msgid = $_GET['msgid'];
$oldMessage = "";
$deletedFormat = "";
// Read the entire string
$str = implode("\n", file('msghistory.txt'));
$fp = fopen('msghistory.txt', 'w');
// Replace something in the file string - this is a VERY simple example
$str = str_replace("$oldMessage", "$deletedFormat", $str);
fwrite($fp, $str, strlen($str));
fclose($fp);
How can I do it?
我该怎么做？
回答by M. Ahmad Zafar
Does this work:
这是否有效：
$msgid = $_GET['msgid'];
$oldMessage = '';
$deletedFormat = '';
//read the entire string
$str=file_get_contents('msghistory.txt');
//replace something in the file string - this is a VERY simple example
$str=str_replace($oldMessage, $deletedFormat,$str);
//write the entire string
file_put_contents('msghistory.txt', $str);
回答by hugsbrugs
Thanks to your comments. I've made a function that give an error message when it happens:
感谢您的评论。我做了一个函数，当它发生时给出错误消息：
/**
* Replaces a string in a file
*
* @param string $FilePath
* @param string $OldText text to be replaced
* @param string $NewText new text
* @return array $Result status (success | error) & message (file exist, file permissions)
*/
function replace_in_file($FilePath, $OldText, $NewText)
{
$Result = array('status' => 'error', 'message' => '');
if(file_exists($FilePath)===TRUE)
{
if(is_writeable($FilePath))
{
try
{
$FileContent = file_get_contents($FilePath);
$FileContent = str_replace($OldText, $NewText, $FileContent);
if(file_put_contents($FilePath, $FileContent) > 0)
{
$Result["status"] = 'success';
}
else
{
$Result["message"] = 'Error while writing file';
}
}
catch(Exception $e)
{
$Result["message"] = 'Error : '.$e;
}
}
else
{
$Result["message"] = 'File '.$FilePath.' is not writable !';
}
}
else
{
$Result["message"] = 'File '.$FilePath.' does not exist !';
}
return $Result;
}
回答by Adrian Goia
This works like a charm, fast and accurate:
这就像一个魅力，快速而准确：
function replace_string_in_file($filename, $string_to_replace, $replace_with){
$content=file_get_contents($filename);
$content_chunks=explode($string_to_replace, $content);
$content=implode($replace_with, $content_chunks);
file_put_contents($filename, $content);
}
Usage:
用法：
$filename="users/data/letter.txt";
$string_to_replace="US$";
$replace_with="Yuan";
replace_string_in_file($filename, $string_to_replace, $replace_with);
// never forget about EXPLODE when it comes about string parsing // it's a powerful and fast tool
// 当涉及到字符串解析时，永远不要忘记 EXPLODE // 它是一个强大而快速的工具
