Got a start on writing to a file

Zyse · February 11, 2010

so I got a start on it using a tutorial online, but stuck at a point of modifying it.

<?php
$File = "links.txt";
$Handle = fopen($File, 'a');
$Data = "Jane Doe";
fwrite($Handle, $Data);
$Data = "Bilbo Jones";
fwrite($Handle, $Data);
print "Data Added";
fclose($Handle);
?>

what I cant get it to do right now is have an input box with a submit button to write to the file, as well as return each line.

I tried a standard submit form but how tdo I make the content link to what was submitted? so far ive made a submit box that doesnt refresh the page saying data added, it just pops up with data added afetr the input box and the box does nothing >_<

WolfRage · February 11, 2010

Please post the form, and any other scripts that you have. Then we can get a better picture of what you are doing and will be able to give you a more specific solution.

Zyse · February 11, 2010

ive gotten a bit farther with this

so heres what I have but getting a parse error on line 4 of process.php

html code is this

<html>
<head><title>Test Page</title></head>
<body>
<h2>Data Collection</h2><p>
<form action="process.php" method="post">
<table>
<tr><td>ID:</td><td><input type="text" name="ID" /><input type="submit" /></td></tr>
</table>
</form>
</body>
</html>

<?php
$File = "links.txt";
$Handle = fopen($File, 'a');
$Data = "http://www.site.com/account="($ID);
fwrite($Handle, $Data);
print "Data Added";
fclose($Handle);
?>

WolfRage · February 11, 2010

you forgot a "." in your code. Should look like this below:

<?php
$File = "links.txt";
$Handle = fopen($File, 'a');
$Data = [url=http://www.site.com/account=]http://www.site.com/account=[/url].($ID);
fwrite($Handle, $Data);
print "Data Added";
fclose($Handle);
?>

Zyse · February 11, 2010

Using that without the URL cause im just tring to get it to right a line to a file on a new line each time, I still get the same parse error using the code you showed me, it doesnt seem to be getting the form data data from the html page, or something else entirely >_<

I editesd it and it says unidentified variable so it isnt getting the form data from the html page.

WolfRage · February 11, 2010

When I pasted your code over it removed the double qoutes and attempted to make it a url. Try it now.

That is very annoying.

<?php
$File = "links.txt";
$Handle = fopen($File, 'a');
$Data = "http://www.site.com/account=".($ID);
fwrite($Handle, $Data);
print "Data Added";
fclose($Handle);
?>

Zyse · February 11, 2010

that accually exactly as I edited it already lol, it says unidentified variable, Also how can I make this all work on the same page using forms and such that way the variable will be present upon submition button, (not refreshing the page.)

WolfRage · February 11, 2010

SO you did not define $ID, did you perhaps mean SID? In that case you do not need the parenthesis either.

In order to put it all on the same page you will either give a name and a value to your submit button or check to see if $_POST['ID'] isset. I think you are trying to use register globals which is a very bad pratice. Try this instead.

<?php
$File = "links.txt";
$Handle = fopen($File, 'a');
$Data = "http://www.site.com/account=".$_POST['ID'];
fwrite($Handle, $Data);
print "Data Added";
fclose($Handle);
?>

Then if you want it on the same page then use a if and else statement to check if $_POST['ID'] isset().

Zyse · February 11, 2010

Wow fantastic that worked, thank you very much, now I just need to do a php redirect back to the submit page,

Also do you happen to know the php read commane to read a random line from a text file and goto it as a url? or in more detailed terms, direct it to a frame?

Thanks again for that assistance.

Zyse · February 11, 2010

I also cant seem to find out ghow to make it do a new line each time instead of writing to the same line >_<

jl5501 · February 11, 2010

append a newline on the end of your data when you write

write($Handle, $Data."\n");

Zyse · February 11, 2010

when doing that it adds a

box to the text file instead of putting it on a new line, if I have a php command read a random line will it take into consideration the boxes are new lines?

WolfRage · February 11, 2010

I believe that jl5501 meant fwrite(). other than that he is right. To add a new line simple change this line:

<?php fwrite($Handle, $Data); ?>

to:

<?php fwrite($Handle, $Data."\n"); ?>

to read a specific line from a file you will want to use fgets() http://php.net/manual/en/function.fgets.php

Then simply echo the fgets() string to the frame.

To redirect use header() http://php.net/manual/en/function.header.php Like:

<?php header([font=consolas]'Location: [url=http://www.example.com/']http://www.example.com/'[/url]);[/font] ?>

Make sure you have no output prior to that command.

Zyse · February 11, 2010

Ty for your replay, I just ignored the missing f and added it in thinking nothing of the typo so I already got that one, but im more looking for a sandom like rather then specific,

my last thing I need is it to open a random line as url to a frame on the right,, but ty so much, ill be back tomorrow.

WolfRage · February 11, 2010

Well you will need to count the number of lines in the file and then pick a random number between zero and the number of lines. To loop through the file use a while like so:

<?php 
[font=consolas]$fp = fopen("myfile.txt", "r");
while (!feof($fp)) {
  // increment your counter.
}
fclose($fp);[/font]
?>

To learn more check out http://php.net/manual/en/function.feof.php & http://php.net/manual/en/function.fgets.php

Zyse · February 11, 2010

where would I incorperate this style of code, by using it is there a echo I can use to tell me how many lines there are to make sure its reading correctly?

Zyse · February 12, 2010

Bah im getting no luck in verifying its reading the file >_< im using the code as posted.

WolfRage · February 12, 2010

Come on now try to learn. You know that this code was not complete I stated you need to increment your counter, which is not defined, plus you need to echo it.

<?php 
$fp = fopen("myfile.txt", "r");
$count=0;
while (!feof($fp)) {
$count=$count+1;
}
echo 'The number of lines in this file is = '.$count.' +1 because the file and the counter start at line 0.';
fclose($fp);
?>

Zyse · February 12, 2010

I am sorry, I'm trying to learn I have been staring at that page you linked me to figure it out, but my brain is full XD, ok im trying I promise.

OMG I know what I was doing wrong why I couldnt get the last script to work... im such a tard. I was trying to open the file without using the browser >.>.

ok ok im on the same page now.

Hmm it seems to loop indefinitely, I also changed the echo to print, if thats ok in the coding for referencing later.

Bah it then loops and errors an infinite amount of these on a page

Warning: feof() expects parameter 1 to be resource, boolean given in C:\wamp\www\ran\process.php on line 13

while (!feof($fp))

Zyse · February 12, 2010

<?php

$file = "links.txt";
  $lines = count(file($file));
echo " " .$lines. " lines in total";

?>

I found a tut for this and it counts the lines, but is this to simple in order for it to grab a random line it counted?

Zyse · February 12, 2010

<?php
echo countLines("links.txt");
function countLines($filepath) 
{
    $handle = fopen( $filepath, "r" );
    $count = 0;
    while( fgets($handle) ) 
    {
        $count++;
    }
    fclose($handle);
    return $count;
}

?>

I also found that this can also be used as an increment, using this seems to avoind the constant loop or hang up, would this be a better method to count lines in order to grab a random one as an url?

Edit

Found out how to call a random line from file seems to work but pulls up the first line most of the time.

Zyse · February 12, 2010

<?php

srand ((double)microtime()*1000000);

$f_contents = file ("links.txt");

$line = $f_contents[array_rand ($f_contents)];

print $line;

?>

for the grabbing of random line.

Zyse · February 12, 2010

<?php
srand ((double)microtime()*1000000);
$f_contents = file ("links.txt");
$line = $f_contents[array_rand ($f_contents)];
echo "<FORM METHOD="."LINK"." ACTION=".$line.">
<INPUT TYPE="."submit"." VALUE="."Random".">
</FORM>";
?>
<form><input type=button value="refresh" onClick="window.location.reload()"></form>

Ive got this for getting a random line and going to a url ith it, but cant figure out how to make it 1 button that refreshed after clicking, as well is how to set the target as a frame, was it target="framename"?

WolfRage · February 12, 2010

Yes target = "framename" shoud do it. This method is probably the simplest method it enact however it is also the most resource intensive as it reads the entire file into an array.

$lines = count(file($file));

I think the best appraoch is to use the while with the fgets() as it automatically advances the file pointer. Sorry about the infinite loop, I forgot to use fgets in my example along with incrementing the counter which caused your loop.

So I would do it like this:

$handle = fopen( $filepath, "r" );
$count =0;
while( fgets($handle) )  { $count++; }
$line=rand(0,$count);
fseek($handle,0); 
fseek($handle,$line);
$data=fgets($handle);
fclose($handle);
echo '<FORM METHOD="'."LINK".'" ACTION="'.$line.'">
<INPUT TYPE="'."submit".'" VALUE="'.$data.'">
</FORM>';
//Your echo statement was not producing valid HTML. Hope this advances your quest!

Make sure you replace "LINK" with your actual link...

Zyse · February 13, 2010

So I pretty much have it almost complete, ill post in a bti after a couple more tests.

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