[lylesback2]

I'm working on a file system (thanks to help from programmingTalk) and now i'm stuck on deleting a selected line from a file.

Say I wanted to delete line 4, out of 23, how can I go about doing that?
So far the code I have will display which lines in an array, that it wants to delete, and is already in a for loop

PHP Code:

if(isset($_POST['Band'])) {
    for ($i=0; $i<count($_POST['Band']);$i++) {

       $LineNumber = $_POST['Band'][$i];
       echo $LineNumber;

    }
} 

so far that will only display what is selected (the echo was just to see if it works)
Thanks!

[Keith]

You will have to suck the file into an array, probably easiest with file().

Then you can either remove the value you'd like zapped and implode() the contents back into the file, or rewrite the file and skip over the unwanted line with a blank space.

Also, after removing the line, will the unwanted line be left as an open empty line, or just removed altogether? So with 23 original lines, will removing line #4 leave 23 lines with a blank 4th line... or 22 full lines?

[lylesback2]

Oh, the line number will be removed all together, making it appear as if nothing was ever modified.

I read some guides though google that said to take the lines I want, skip the line(s) being deleted, and write to file...

[Keith]

Here's a quick and dirty example that should do what you'd like:

PHP Code:

<?php

// The file
$filePath = './file.txt';

// Grab file into an array, by lines
$fileArr = file( $filePath );

// Remove desired line
unset( $fileArr[3] ); // $fileArr[3] == line #4

// Put back with PHP4
$success = FALSE;
if ( ( $fp = fopen( $filePath, 'w' ) ) !== FALSE )
{
    if ( flock( $fp, 2 ) ) // LOCK_EX
    {
        fwrite( $fp, implode( '', $fileArr ) );
        flock( $fp, 3 ); // LOCK_UN
        $success = TRUE;
    }
    fclose( $fp );
}

/*
// Or, put back with PHP5
$success = FALSE;
if ( file_put_contents( $filePath, implode( '', $fileArr ), LOCK_EX ) )
{
    $success = TRUE;
}
*/

?>