Update a row in txt file

[kate_30]

Hi all

I have a txt file with this values:

 

parameter1

parameter two

third value

others values...

 

From a form, I would edit the parameters above:

<form method="POST" action="edit.php">
<?php

$rows = file("file.txt");


for($i=0; $i < count($rows); $i++) {

echo "<input type=text name=$rows[$i] value=$rows[$i]><br />";

}

?>

<input type="submit" value="Edit" name="submit"></p>

</form>

<?php

if (isset($_POST['submit'])) {


$upd= $_POST[$rows[$i]];


if(!($fp = fopen("file.txt","r+"))) {

   echo "Error";

  } else {

   fwrite($fp, $upd);

   fclose($fp);

}

}

?>

 

I use this but doesn't works.

Where it is wrong?

[GingerRobot]

Im guessing by "doesn't work" you mean that when you try and edit the file, it doesn't edit successfully. Try:

 

<form method="POST" action="edit.php">
<?php

$rows = file("file.txt");


for($i=0; $i < count($rows); $i++) {

echo "<input type='text' name='lines[$i]' value='$rows[$i]'><br />";

}

?>

<input type="submit" value="Edit" name="submit"></p>

</form>

<?php

if (isset($_POST['submit'])) {

$towrite = implode("\n",$_POST['lines']);

if(!($fp = fopen("file.txt","r+"))) {

   echo "Error";

  } else {

   fwrite($fp, $towrite);

   fclose($fp);

}

}

?>

It's untested, but give it a go.

 

Notice the way that i've named the text fields as an array. Without doing this, you would have to open the file again, and extract each field name - since the name of the fields was what was on each line of the text file.

[mpharo]

<form method="POST" action="edit.php">
<?php

$rows = file("file.txt");


foreach ($rows as $rows_num => $rows) {
   echo "<input type=text name=$rows_num value=$rows><br />";
}

?>

<input type="submit" value="Edit" name="submit"></p>

</form>

<?php

if (isset($_POST['submit'])) {


$upd= $_POST[$rows];


if(!($fp = fopen("file.txt","r+"))) {

   echo "Error";

  } else {

   fwrite($fp, $upd);

   fclose($fp);

}

}

?>

 

[kate_30]

Im guessing by "doesn't work" you mean that when you try and edit the file, it doesn't edit successfully. Try:

 

<form method="POST" action="edit.php">
<?php
$rows = file("file.txt");

for($i=0; $i < count($rows); $i++) {

echo "<input type='text' name='lines[$i]' value='$rows[$i]'><br />";
}

?>
<input type="submit" value="Edit" name="submit"></p>
</form>

<?php
if (isset($_POST['submit'])) {
$towrite = implode("\n",$_POST['lines']);

if(!($fp = fopen("file.txt","r+"))) {

   echo "Error";

  } else {

   fwrite($fp, $towrite);

   fclose($fp);

}

}

?>

It's untested, but give it a go.

Notice the way that i've named the text fields as an array. Without doing this, you would have to open the file again, and extract each field name - since the name of the fields was what was on each line of the text file.

 

This works but a strange thing happens:

try to edit, from input text, the second value "parameter two" to a thing as "parameter two onetwothreefourfive"

Then click submit and after edit the value above to original "parameter two".

Will be created another row in txt file!!

 

Why?