Write to a specific line?

How do I write to a specific line ($number) of a flat file?

Thanks,
Peter

 

Could you explain what you mean a bit more in depth?

 

Flat file:

Purple
Green
Red
Orange
Pink
Maroon

Code (markup):

I want to replace a line of my choice (dictated by a variable called $number) with the word "Blue."

Thanks,
Peter

 

echo str_replace("Orange","Blue", $file)

PHP:

 

Well, I don't think it's that simple.

Instead of telling the script to replace "Orange," I want it to replace the line number of my choice (represented by $number).

 

There may be a better way, especially if you're handling larger files, but you could load the entire file into an array using file(), update the array (where line number-1 = array key) and save.

$fileName = 'stuff.txt';
$lineNumber = 10;
$changeTo = "the changed line\n\r";

// Load file into array
$contents = file($fileName);

// Replace line
$contents[$lineNumber-1] = $changeTo;

// Implode and save
file_put_contents($fileName, implode('',$contents));

PHP:

 

You could also use the explode function, and a form to decide what line you want to edit.

 

Fatal error: Call to undefined function: file_put_contents() in /home/user/public_html/folder/folder/file.php on line 21

 

http://forums.digitalpoint.com/showthread.php?t=321249

The second post in that thread might be of some help. I just need to change it to replace the line, rather than delete it.

 

You have an old version of PHP. See this page for alternatives for file_put_contents().

http://www.php.net/file_put_contents

 

Done! Thanks!