[英]PHP write in file in specific location
Imagine I have a TXT file with the following contents: 想象一下,我有一个包含以下内容的TXT文件:
Hello
How are you
Paris
London
And I want to write beneath Paris, so Paris has the index of 2, and I want to write in 3. 我想在巴黎下面写东西,所以巴黎的索引为2,我想写3。
Currently, I have this: 目前,我有这个:
$fileName = 'file.txt';
$lineNumber = 3;
$changeTo = "the changed line\n";
$contents = file($fileName);
$contents[$lineNumber] = $changeTo;
file_put_contents($fileName, implode('',$contents));
But it only modifies the specific line. 但是它仅修改特定的行。 And I don't want to modify, I want to write a new line and let the others stay where they are. 而且我不想修改,我想写一个新行,让其他人留在原处。
How can I do this? 我怎样才能做到这一点?
Edit : Solved. 编辑 :已解决。 In a very easy way: 以一种非常简单的方式:
$contents = file($filename);
$contents[2] = $contents[2] . "\n"; // Gives a new line
file_put_contents($filename, implode('',$contents));
$contents = file($filename);
$contents[3] = "Nooooooo!\n";
file_put_contents($filename, implode('',$contents));
You need to parse the contents of the file, place the contents in a new array and when the line number you want comes up, insert the new content into that array. 您需要解析文件的内容,将内容放置在新的数组中,然后在出现所需的行号时,将新内容插入该数组中。 And then save the new contents to a file. 然后将新内容保存到文件中。 Adjusted code below: 调整后的代码如下:
$fileName = 'file.txt';
$lineNumber = 3;
$changeTo = "the changed line\n";
$contents = file($fileName);
$new_contents = array();
foreach ($contents as $key => $value) {
$new_contents[] = $value;
if ($key == $lineNumber) {
$new_contents[] = $changeTo;
}
}
file_put_contents($fileName, implode('',$new_contents));
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