I am having some trouble with a PHP file I have. My fopen() call is failing and I can't work out why. I have full permissions to the file (currently set to 777), and the only thing I can think of is that the file is already open, but I can't work out why this would be. My code is made up of a landing PHP page and an action PHP page. The landing page is below:
<!DOCTYPE HTML>
<html>
<head>
<title>Canteen Manager</title>
<link type="text/css" rel="stylesheet" href="style_common.css"/>
<link type="text/css" rel="stylesheet" href="style_addstock.css"/>
</head>
<body>
<div class="header">
<img src="images/aafclogo.png" class="aafclogo">
<h3>Add Stock</h3>
</div>
<p>Select Product:</p>
<form action="addstockaction.php" method="post" name="formExistingProduct">
<input type='hidden' name='productType' value='existing'>
<select name="products">
<?php
class Product {
public $name = "";
public $amount = "";
}
$myfile = fopen("stock.txt", "r") or die("Unable to open file!");
while(!feof($myfile)) {
$fileContents = $fileContents . fgets($myfile);
}
fclose($myfile);
$dictionary = json_decode($fileContents, true);
for ($i = 0; $i < count($dictionary); ++$i) {
echo "<option value=" . $i . ">" . $dictionary[$i]['name'] . " </option>";
}
?>
</select>
<input type="number" name="txtNumber" min="1"><br><br>
<input type="submit" value="Update Amount">
</form>
When the user submits the form, it calls the following PHP file:
<!DOCTYPE HTML>
<html>
<head>
<title>Canteen Manager</title>
<link type="text/css" rel="stylesheet" href="style_common.css"/>
</head>
<body>
<?php
/*$myfile = fopen("stock.txt", "r") or die("Unable to open file!");
while(!feof($myfile)) {
$fileContents = $fileContents . fgets($myfile);
}
fclose($myfile);*/
$fileContents = file_get_contents("stock.txt");
echo $fileContents;
$dictionary = json_decode($fileContents, true);
$dictionary[$_POST['products']]['amount'] = $dictionary[$_POST['products']]['amount'] + $_POST['txtNumber'];
$json = json_encode($dictionary, true);
$writeFile = fopen("stock.txt", "w") or die("Unable to open file for writing!");
$txt = $json;
fwrite($writeFile, $txt);
fclose($writeFile);
echo "<p><strong>Added " . $_POST['txtNumber'] . " items to " . $dictionary[$_POST['products']]['name'] . "</strong></p><br><br>";
?>
<br><br><div class="buttonContainer">
<a href="addstock.php"><div class="button">
<p>Add More Items</p>
</div></a>
<a href="index.php"><div class="button">
<p>Home</p>
</div></a>
</div>
The action PHP file falls over during the $writeFile = fopen("stock.txt", "w") or die("Unable to open file for writing!"); line, when it comes up with the 'Unable to open file for writing!' line.
What am I doing wrong?
EDIT
I created a test PHP file (called test.php) and placed in the same location on the server as my current files. The file contained just the following code:
<!DOCTYPE HTML>
<html>
<head>
<title>Canteen Manager</title>
<link type="text/css" rel="stylesheet" href="style_common.css"/>
<link type="text/css" rel="stylesheet" href="style_addstock.css"/>
</head>
<body>
<?php
$writeFile = fopen("stock.txt", "w") or die("Unable to open file for writing!");
$txt = $json;
fwrite($writeFile, '[{"name":"Boost","amount":10},{"name":"Chicken Noodles","amount":10},{"name":"Twix","amount":10}]');
//fwrite($writeFile, "test");
fclose($writeFile);
echo "<strong>Success</strong>";
?>
</body>
</html>
When I ran this initially, it succeeded in opening the file, but would not write to it. Instead it would clear it. Since copying that code over to my live file, both files get the error I was getting before. For me, this supports the theory that the file is open somewhere and therefore can't be opened again. I thought it might be my FTP client, so I closed that and tried, but same error. I have confirmed that the file (stock.txt) isn't open in my browser, nor in use by any programs on my laptop.
I am really stuck on this. Does anyone have a better way to write to a file (keep in mind I am over-writing the file at this point). I would really appreciate any advice, whether in regards to fixing my issues, or a different way to tackle the problem.
EDIT 2
I found the file permissions were set to 644 despite me setting them to 777, so I set them back to 777 and didn't receive the die warning. However, when I ran the code, I found it didn't write to the file, instead it just cleared it (emptied it of characters). My writing code is above, but I will copy it below for clarity:
$fileContents = file_get_contents("stock.txt");
echo $fileContents;
$dictionary = json_decode($fileContents, true);
$dictionary[$_POST['products']]['amount'] = $dictionary[$_POST['products']]['amount'] + $_POST['txtNumber'];
$json = json_encode($dictionary, true);
$writeFile = fopen("stock.txt", "w") or die("Unable to open file for writing!");
$txt = $json;
fwrite($writeFile, $txt);
fclose($writeFile);
echo "<p><strong>Added " . $_POST['txtNumber'] . " items to " . $dictionary[$_POST['products']]['name'] . "</strong></p><br><br>";
Any suggestions?
