Deleting Lines

[matt72]

Hi There! I'm having a slight bit of trouble and I hope someone can help me 🙂

I would like to be able to remove a line from a text file... Here's where I'm at so far:

<?php
//the file
$master = file("master.txt");

//get a random word from the master text file
$word = $master[rand(0, count($master) - 1)];

//add the random word to a different text file
$fp= fopen ("1.txt", 'a');
fwrite ($fp, "$word\n");
fclose ($fp);


/* Here I would like to be able to delete the $word that I've just used from the master.txt */
?>

I hope this is clear enough to understand, because I have a hard time expressing what I would like to do.

Thanks in advance for any help!

Matt

[shawon22]

<?php 
//the file 
$master = file("master.txt"); 

//get a random word from the master text file 
$randNum = rand(0, count($master)-1);

$word = $master[$randNum]; 

//add the random word to a different text file 
$fp= fopen ("1.txt", 'a'); 
fwrite ($fp, "$word\n"); 
fclose ($fp); 

for($i=0; $i<count($master); $i++)
{
    if($i != $randNum)
       $updatedData[] = $master[$i];
}
/* Here I would like to be able to delete the $word that I've just used from the master.txt */ 
unlink("master.txt");
$fp = fopen("master.txt", "a");
for($i=0; $i<count($updatedData); $i++)
fwrite($fp, $updatedData[$i]);
fclose($fp);
?>

[matt72]

Thanks very much! That work perfectly!

Now I've got another question though, I would like to use everything shown so far in a while loop, to say take 10 random words from master.txt and put them into 1.txt

However when I try to do this as is, the words that are put back into master text repeat and the file starts to get very big...

Any thoughts?

Thanks Again!

Matt

[laserlight]

This seems to work:

<?php
//the file
$master = file("master.txt");

//get a random word from the master text file
$randnum = rand(0, count($master) - 1);

//add the random word to a different text file
$fp = fopen("1.txt", "a");
fwrite($fp, $master[$randnum]);
fclose($fp);

//remove the random word
unset($master[$randnum]);

//overwrite the master text file with $master
$fp = fopen("master.txt", "w");
foreach ($master as $str)
	fwrite($fp, $str);
fclose($fp);
?>

Note that file() returns an array that includes the end of line character if an element has one, so writing to the other file should not need "\n"

[laserlight]

This might solve your 2nd problem:

<?php
//the file
$master = file("master.txt");

//get 10 random words from the master text file
$word_keys = array_rand($master, 10);

//add the random words to a different text file
$fp = fopen("1.txt", "a");
foreach ($word_keys as $word_key) {
	//write the word
	fwrite($fp, $master[$word_key]);
	//remove it from $master[]
	unset ($master[$word_key]);
}
fclose($fp);

//overwrite the master text file with $master
$fp = fopen("master.txt", "w");
foreach ($master as $str)
	fwrite($fp, $str);
fclose($fp);
?>

You may have to seed the pseudorandom number generator first with srand() though.

[matt72]

That you very very much laserlight! That worked perfectly! 🙂