PHP appending to file from specific position

Question

In php i am opening a text file and appending to it. However I need to append 3 chars before the end of file. In other words i need to append/write from a specific place in the file.

Can any one help?

Best Regards Luben

Please show us your code. And take a look at php.net/manual/fr/function.fseek.php — soju
– soju, Commented May 12, 2011 at 14:10

Erbureth · Accepted Answer · 2011-05-12 15:11:05Z

10

You need to open the file for edit, seek to the desired position and then write to the file, eg.:

<?php
  $file = fopen($filename, "c");
  fseek($file, -3, SEEK_END);
  fwrite($file, "whatever you want to write");
  fclose($file);
?>

Further reference at php.net - fseek doc

Hope that helps.

edited May 12, 2011 at 15:11

answered May 12, 2011 at 14:24

Erbureth

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4 Comments

Nebula Over a year ago

Sorry but you are wrong! I tried that before I posted here, I should have mentioned that. If you open a file with a or a+ it will append to the end regardless of fseek() or rewind(). Read the notes ant the bottom of the link you posted. Another thing if I use w or w+ it simply starts from the beginning. Any other suggestions?

Neil Aitken Over a year ago

The bottom of the article also states that by opening the file in 'r+' you should be able to use fseek()

Erbureth Over a year ago

@Luben you are right, I haven't read it properly. The correct mode is "c" or "c+" (or you can use "r+", as @Neil Aitken said :)), as stated in link I have edited the response to reflect it.

Nebula Over a year ago

@Neil Aitken && @Erbureth Thanks so much for the help guys! You are both right. r+ and c or c+ work perfectly!!

Alex B · Accepted Answer · 2011-05-12 14:17:24Z

1

If it's a short text file and you are only doing this once you can read in the contents (with fread()), store it only upto 3 chars from the end using substring and then append your new content onto the end of that and write.

But as I say if this is a regular thing and/or with large files, this isn't the best approach. I'll have a think.

Hope this helps

answered May 12, 2011 at 14:17

Alex B

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3 Comments

Nebula Over a year ago

Thanks Alex B! I didn't think of that and it may be a solution. But I'm afraid the files might get pretty big....say up to 1000 chars. If I can't find anything else I'll create a dummy file and do some tests.

KingCrunch Over a year ago

@Luben: 1000 characters are around 1kB (in ascii 1 character = 1 Byte). Its safe to read it completely into the memory.

Nebula Over a year ago

Thanks King! Ideally I want to use Erbureth's method that he mentions above but unfortunately that doesn't work. I will look around and if not tomorrow I'll do as you say.

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