Updating a variable

xwin

Okay, let's say I have a text file, it's contents looking like this.

1|a
2|b
3|c
4|d

So, I get it into an array. Everything <- of the | is $var1, everything -> of the | is $var2. Now, let's say I want to update the second line. In another file, I have a variable containing 2, let's say. So, we've pinpointed that line. But now, what if I want to change the b in line 2 to something else, but leave the rest of the contents of the file. How can this be done?

Thanks.

rohithmr

u cudd use file() to load each line in ur first file in an array, and then just replace the line u want to edit with the modified version and write it back. This is not recommended for large text files.

xwin

Yeah, but how to set the file pointer when I write? I know how to get -to- the line, and change the variable, just not how to put it back where I want it.

rohithmr

hmm ok lets go thru dis u have dis file:

file1.dat

1|a 
2|b 
3|c 
4|d

ok in ur script:

script.php

<?php 
$file = 'file1.dat';

$lines = file($file);
// Now u want to replace a particular line 
//with the data from sum other file.

// Code to get the other stuff goes here ..

//At this point u kno which line u want to edit.
//Say that is the second line.
//So the second line will be in $Lines[1].
$lines[1] = 'New|Data|from|other file';
//form the data to write
$data = implode($lines,"\n");
$fp = fopen($file,"w");
fwrite($fp,$data);
fclose($fp);
?>