Quick PHP question - fopen() and related

Jeanco · 06-01-2004, 12:01 PM

Ok, I have a form set up with the code listed below. What I'm trying to do is when the user submits the form the following happens:

1) The file with the data is opened. This will contain 2 numbers. One holding the number of votes and one with the vote total (explained in more detail later).
2) the two numbers are stored to two variables, $voteTotal and $numVotes or something like that.
3) The new vote is added to $voteTotal (its a rating script so this will be a number between 1 and 10) and $numVotes is increased by one.
4) Finally, I want to the file saved and closed. The data still stored in $numVotes and $voteTotal will be used to display an avg rating (avg = $voteTotal/$numVotes).

As you can see I have this planned out I just can't compeltely figure out how the fopen() fread() and fwrite() functions work. Any help would be appreciated. Here is the code for the form:

PHP Code:

      <form action="process.php" method="get">

    <select name="menu1" onChange="MM_jumpMenu('parent',this,0)">

  <option>Rate It!</option>

  <option>----------</option>

  <option value="process.php?rating=1">1</option>

  <option value="process.php?rating=2">2</option>

  <option value="process.php?rating=3">3</option>

  <option value="process.php?rating=4">4</option>

  <option value="process.php?rating=5">5</option>

  <option value="process.php?rating=6">6</option>

  <option value="process.php?rating=7">7</option>

  <option value="process.php?rating=8">8</option>

  <option value="process.php?rating=9">9</option>

  <option value="process.php?rating=10">10</option>

</select>

 
    </form>

Thanks

adam_uk · 06-01-2004, 03:14 PM

are the votes stored in one text file?

http://uk.php.net/manual/en/function.fwrite.php

this page should explain most of what you need

fopen will load a file so it can be read. written etc etc fopen("local/path/to/file", "r+");

the r+ tells php that you need to write to the file

fread will open the contents of the file you just opened

fwrite will write to the file

fclose is needed to free up the resources of the opened file

if not

php.net/fread
php.net/fopen

RJ · 06-01-2004, 03:25 PM

Hi Ryan,

Can you post the snippet from process.php where you read the values and write using fopen?

You may want to consider writing the data to a simple two column MySQL table. It's more reliable than text files and easier to manage.

Also the form you posted seems somewhat unusual. Will that work? This kind of format is what I would use

Code:

<form action="process.php" method="get">
    <select name="rating" onChange="MM_jumpMenu('parent',this,0)">
  <option>Rate It!</option>
  <option>----------</option>
  <option value="1">1</option>
  <option value="2">2</option>
  <option value="3">3</option>
  <option value="4">4</option>
  <option value="5">5</option>
  <option value="6">6</option>
  <option value="7">7</option>
  <option value="8">8</option>
  <option value="9">9</option>
  <option value="10">10</option>
</select>

    </form>

You would when have the $_GET["rating"] (or $rating) variable available to you with the rating value.

Jeanco · 06-01-2004, 03:29 PM

Here is the code I'm using at the moment. I know its not completely efficient (recommend changes if you see them, I'm sitll learning). Its having a bit of problems outputting the results (I'm getting a header error), but its a start:

PHP Code:

  <?php if (!isset($a)) { ?>

 
<script language="JavaScript">

<!--

function MM_jumpMenu(targ,selObj,restore){ //v3.0

eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");

if (restore) selObj.selectedIndex=0;

}

//-->

</script>

 
<table align="center" width="150" border="0" cellspacing="0" cellpadding="0">

  <tr>

    <td>

    <b>Movie:</b> Troy<br>

    <b>Stars:</b>  B. Pitt, O. Bloom<br>

    <b>Director:</b> W. Peterson

    </td>

  </tr>

  <tr>

    <td align="center">

    <form action="entertainment/rating.php" method="get">

    <select name="menu1" onChange="MM_jumpMenu('parent',this,0)">

  <option>Rate It!</option>

  <option>----------</option>

  <option value="entertainment/rating.php?a=1&rating=1">1</option>

  <option value="entertainment/rating.php?a=1&rating=2">2</option>

  <option value="entertainment/rating.php?a=1&rating=3">3</option>

  <option value="entertainment/rating.php?a=1&rating=4">4</option>

  <option value="entertainment/rating.php?a=1&rating=5">5</option>

  <option value="entertainment/rating.php?a=1&rating=6">6</option>

  <option value="entertainment/rating.php?a=1&rating=7">7</option>

  <option value="entertainment/rating.php?a=1&rating=8">8</option>

  <option value="entertainment/rating.php?a=1&rating=9">9</option>

  <option value="entertainment/rating.php?a=1&rating=10">10</option>

</select>

 
    </form>

    </td>

  </tr>

</table>

 
<?php }

    elseif ($a = 1) { //if the action is set to process

        //open the txt file and get the data

        $handle = fopen("http://www.foymedia.com/absolute/website/student/website/entertainment/results.txt","r");

        $numVotes = trim(fgets($handle,80));

        $voteTot = trim(fgets($handle,80));

        fclose($handle);

        

        //process the data

        $numVotes = $numVotes + 1;

        $voteTot = $voteTot + $rating;

        

        //save the file

        $handle = fopen("http://www.foymedia.com/absolute/website/student/website/entertainment/results.txt","w");

        fwrite($handle,$numvotes);

        fwrite($handle,$totvotes);

        fclose($handle);

        

        //reload the index page with the command to display results

        header("Location: [url]http://[/url]".$_SERVER['HTTP_HOST'] . "/absolute/website/student/website/index.php?a=2");

        }

        

    else { //if the action is set to display results

        //open the txt file and get the data

        $handle = fopen("http://www.foymedia.com/absolute/website/student/website/entertainment/results.txt","r");

        $numVotes = trim(fgets($handle,80));

        $voteTot = trim(fgets($handle,80));

        $result = $votTot / $numVotes;

        fclose($handle);

        //display the data ?>

        

<script language="JavaScript">

<!--

function MM_jumpMenu(targ,selObj,restore){ //v3.0

eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");

if (restore) selObj.selectedIndex=0;

}

//-->

</script>        

 
<table align="center" width="150" border="0" cellspacing="0" cellpadding="0">

  <tr>

    <td>

<font size="+1">Troy</font>

    </td>

  </tr>

  <tr>

    <td align="center">

<b>Avg. Rating: <font size="+1"><?php echo $result ?></font></b>

    </td>

  </tr>

</table>

<?php } ?>

Feel free to point out any mistakes you may see

Pablo · 06-07-2004, 08:28 AM

PHP Code:

  // opens file $file

$file = "./users.txt";

$fp = fopen("$file", "a+");

// reads contents of $file

while (!feof($fp)) $content .= fgetc($fp);

$content = $content;

// explodes contents to remove all spaces and put each word/number in an array

$stats = explode(" ", $content);

while (list($index, $stat) = each ($stats));

// changes your votes $stats[0] = the first number/word +1 up each word

$numVotes = $stats[0] + 1;

$voteTot = $stats[1]  + $rating;

$cont = "$numVotes $voteTot";

// writes the new votes and total in $file

fwrite($fp, "$cont");

fclose($fp); 

// refresh page here

That should work for you.

You have to phase out you url.

Quote:

header("Location: <a href="http://" target="_blank">http://</a>".$_SERVER['HTTP_HOST'] . "/absolute/website/student/website/index.php?a=2");

try adding the URL in a variable eg.

PHP Code:

  $server = $_SERVER['HTTP_HOST'];

$link = "http://" . "$server" . "/absolute/website/student/website/index.php?a=2";

header("Location: <a href=\"$link\" target=\"_blank\">$link</a>");

06-01-2004, 12:01 PM	#1 (permalink)
Jeanco RyanPrice.ca - Developer Join Date: Dec 2003 Posts: 1,331 34.00 NP$ (Donate)	Quick PHP question - fopen() and related Ok, I have a form set up with the code listed below. What I'm trying to do is when the user submits the form the following happens: 1) The file with the data is opened. This will contain 2 numbers. One holding the number of votes and one with the vote total (explained in more detail later). 2) the two numbers are stored to two variables, $voteTotal and $numVotes or something like that. 3) The new vote is added to $voteTotal (its a rating script so this will be a number between 1 and 10) and $numVotes is increased by one. 4) Finally, I want to the file saved and closed. The data still stored in $numVotes and $voteTotal will be used to display an avg rating (avg = $voteTotal/$numVotes). As you can see I have this planned out I just can't compeltely figure out how the fopen() fread() and fwrite() functions work. Any help would be appreciated. Here is the code for the form: PHP Code: <form action="process.php" method="get"> <select name="menu1" onChange="MM_jumpMenu('parent',this,0)"> <option>Rate It!</option> <option>----------</option> <option value="process.php?rating=1">1</option> <option value="process.php?rating=2">2</option> <option value="process.php?rating=3">3</option> <option value="process.php?rating=4">4</option> <option value="process.php?rating=5">5</option> <option value="process.php?rating=6">6</option> <option value="process.php?rating=7">7</option> <option value="process.php?rating=8">8</option> <option value="process.php?rating=9">9</option> <option value="process.php?rating=10">10</option> </select> </form> Thanks __________________ Ryan Price - Webmaster www.HostDurham.com - For Hosting \| www.jeanco.ca - For Webdesign

06-01-2004, 03:14 PM	#2 (permalink)
adam_uk Senior Member Join Date: May 2003 Posts: 2,211 6,170.25 NP$ (Donate)	are the votes stored in one text file? http://uk.php.net/manual/en/function.fwrite.php this page should explain most of what you need fopen will load a file so it can be read. written etc etc fopen("local/path/to/file", "r+"); the r+ tells php that you need to write to the file fread will open the contents of the file you just opened fwrite will write to the file fclose is needed to free up the resources of the opened file if not php.net/fread php.net/fopen Last edited by adam_uk; 06-01-2004 at 03:22 PM.

06-01-2004, 03:29 PM	#4 (permalink)
Jeanco RyanPrice.ca - Developer Join Date: Dec 2003 Posts: 1,331 34.00 NP$ (Donate)	Here is the code I'm using at the moment. I know its not completely efficient (recommend changes if you see them, I'm sitll learning). Its having a bit of problems outputting the results (I'm getting a header error), but its a start: PHP Code: <?php if (!isset($a)) { ?> <script language="JavaScript"> <!-- function MM_jumpMenu(targ,selObj,restore){ //v3.0 eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'"); if (restore) selObj.selectedIndex=0; } //--> </script> <table align="center" width="150" border="0" cellspacing="0" cellpadding="0"> <tr> <td> <b>Movie:</b> Troy<br> <b>Stars:</b> B. Pitt, O. Bloom<br> <b>Director:</b> W. Peterson </td> </tr> <tr> <td align="center"> <form action="entertainment/rating.php" method="get"> <select name="menu1" onChange="MM_jumpMenu('parent',this,0)"> <option>Rate It!</option> <option>----------</option> <option value="entertainment/rating.php?a=1&rating=1">1</option> <option value="entertainment/rating.php?a=1&rating=2">2</option> <option value="entertainment/rating.php?a=1&rating=3">3</option> <option value="entertainment/rating.php?a=1&rating=4">4</option> <option value="entertainment/rating.php?a=1&rating=5">5</option> <option value="entertainment/rating.php?a=1&rating=6">6</option> <option value="entertainment/rating.php?a=1&rating=7">7</option> <option value="entertainment/rating.php?a=1&rating=8">8</option> <option value="entertainment/rating.php?a=1&rating=9">9</option> <option value="entertainment/rating.php?a=1&rating=10">10</option> </select> </form> </td> </tr> </table> <?php } elseif ($a = 1) { //if the action is set to process //open the txt file and get the data $handle = fopen("http://www.foymedia.com/absolute/website/student/website/entertainment/results.txt","r"); $numVotes = trim(fgets($handle,80)); $voteTot = trim(fgets($handle,80)); fclose($handle); //process the data $numVotes = $numVotes + 1; $voteTot = $voteTot + $rating; //save the file $handle = fopen("http://www.foymedia.com/absolute/website/student/website/entertainment/results.txt","w"); fwrite($handle,$numvotes); fwrite($handle,$totvotes); fclose($handle); //reload the index page with the command to display results header("Location: [url]http://[/url]".$_SERVER['HTTP_HOST'] . "/absolute/website/student/website/index.php?a=2"); } else { //if the action is set to display results //open the txt file and get the data $handle = fopen("http://www.foymedia.com/absolute/website/student/website/entertainment/results.txt","r"); $numVotes = trim(fgets($handle,80)); $voteTot = trim(fgets($handle,80)); $result = $votTot / $numVotes; fclose($handle); //display the data ?> <script language="JavaScript"> <!-- function MM_jumpMenu(targ,selObj,restore){ //v3.0 eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'"); if (restore) selObj.selectedIndex=0; } //--> </script> <table align="center" width="150" border="0" cellspacing="0" cellpadding="0"> <tr> <td> <font size="+1">Troy</font> </td> </tr> <tr> <td align="center"> <b>Avg. Rating: <font size="+1"><?php echo $result ?></font></b> </td> </tr> </table> <?php } ?> Feel free to point out any mistakes you may see __________________ Ryan Price - Webmaster www.HostDurham.com - For Hosting \| www.jeanco.ca - For Webdesign

06-01-2004, 03:25 PM	#3 (permalink)
RJ NamePros Founder Administrator Join Date: Feb 2003 Location: Bay Area, CA Posts: 13,173 102,201.68 NP$ (Donate)	Hi Ryan, Can you post the snippet from process.php where you read the values and write using fopen? You may want to consider writing the data to a simple two column MySQL table. It's more reliable than text files and easier to manage. Also the form you posted seems somewhat unusual. Will that work? This kind of format is what I would use Code: <form action="process.php" method="get"> <select name="rating" onChange="MM_jumpMenu('parent',this,0)"> <option>Rate It!</option> <option>----------</option> <option value="1">1</option> <option value="2">2</option> <option value="3">3</option> <option value="4">4</option> <option value="5">5</option> <option value="6">6</option> <option value="7">7</option> <option value="8">8</option> <option value="9">9</option> <option value="10">10</option> </select> </form> You would when have the $_GET["rating"] (or $rating) variable available to you with the rating value.

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