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Creating a News System with PHP


For those web developers that are wishing to create a news service on a website, Matt has come to your aide in this article. It entails two lessons that will guide you towards this goal.

Author Info:
By: Matt Wade
Rating: 4 stars4 stars4 stars4 stars4 stars / 20
April 14, 2003
TABLE OF CONTENTS:
  1. · Creating a News System with PHP
  2. · Lesson 2
  3. · The Final Product

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Creating a News System with PHP - The Final Product
(Page 3 of 3 )

That's it! Now we have edit and delete functionality to our little news system. I would like to remind everyone, however, that this is all meant to just be an exercise in PHP.

There are many other concerns to worry about when making a real live news system such as concurrent use, other strange characters that can get in the mix, and millions of other things. You CAN use this for a live news system, but this should really be taken as a learning lesson. OK, on to the final code for our new administrative script.

<?
if($action == "edit" && isset($HTTP_POST_VARS['password'])) {
    //obviously you should change this password on the next line
    if($HTTP_POST_VARS['password'] == "editpass") {
        //First let's recompile that line with the pipe symbols so we can reinsert it
        $line = $HTTP_POST_VARS['date'] . "|" . $HTTP_POST_VARS['name'];
        $line .= "|" . $HTTP_POST_VARS['news'];
        $line = str_replace("\r\n","<BR>",$line);
        $line .= "\r\n";
        $data = file('news.txt');
        $data[$id] = $line;
        //the next line makes sure the $data array starts at the beginning
        reset($data);
        //now we open the file with mode 'w' which truncates the file
        $fp = fopen('news.txt','w');
        foreach($data as $element) {
            fwrite($fp, $element);
        }
        fclose($fp);
        echo "Item Edited!<BR><BR>\n";
        echo "<a href=\"$PHP_SELF\">Go Back</a>\n";
        exit;
    } else {
        echo "Bad password!\n";
        exit;
    }
}
if($action == "edit") {
    $data = file('news.txt');
    $element = trim($data[$id]);
    $pieces = explode("|", $element);
    //the next line is to reverse the process of turning the end of lines into breaking returns
    $news = str_replace("<BR>","\r\n",$pieces[2]);
    echo "Make the changes you would like and press save.<BR>\n";
    echo "<FORM ACTION=\"$PHP_SELF?action=edit\" METHOD=\"POST\" NAME=\"editform\">\n";
    echo "Name:<BR>\n";
    echo "<INPUT TYPE=\"text\" SIZE=\"30\" NAME=\"name\" value=\"".$pieces[1]."\"><BR>\n";
    echo "The
News:<BR>\n
";
    echo "<TEXTAREA NAME=\"news\" COLS=\"40\" ROWS=\"5\">".$news."</TEXTAREA><BR><BR>\n";
    echo "Password:<BR>\n";
    echo "<INPUT TYPE=\"password\" SIZE=\"30\" NAME=\"password\"><BR>\n";
    echo "<INPUT TYPE=\"hidden\" NAME=\"date\" VALUE=\"".$pieces[0]."\">\n";
    echo "<INPUT TYPE=\"hidden\" NAME=\"id\" VALUE=\"$id\">\n";
    echo "<INPUT TYPE=\"submit\" NAME=\"submit\" VALUE=\"Save\"><BR>\n";
    echo "</FORM>\n";
    exit;
}
if($action == "delete" && isset($HTTP_POST_VARS['password'])) {
    //obviously you should change this password on the next line
    if($HTTP_POST_VARS['password'] == "deletepass") {
        $data = file('news.txt');
        //this next line will remove the single news item from the array
        array_splice($data,$id,1);
        //now we open the file with mode 'w' which truncates the file
        $fp = fopen('news.txt','w');
        foreach($data as $element) {
            fwrite($fp, $element);
        }
        fclose($fp);   
        echo "Item deleted!<BR><BR>\n";   
        echo "<a href=\"$PHP_SELF\">Go Back</a>\n";
        exit;
    } else {
        echo "Bad password!\n";
        exit;
    }
}
if($action == "delete") {
    echo "<H2>You are about to delete the following news item.</H2>\n";
    $data = file('news.txt');
    $element = trim($data[$id]);
    $pieces = explode("|", $element);
    echo $pieces[2] . "<BR>" . "<b>Posted by " . $pieces[1] . " on " . $pieces[0] . "</b>\n";
    echo "<BR><BR>\n";
    echo "Are you sure you want to delete this news item? If so, enter the password and click on Delete.<BR>\n";
    echo "<FORM ACTION=\"$PHP_SELF?action=delete\" METHOD=\"POST\" NAME=\"deleteform\">\n";
    echo "Password:<BR>\n";
    echo "<INPUT TYPE=\"password\" SIZE=\"30\" NAME=\"password\"><BR>\n";
    echo "<INPUT TYPE=\"hidden\" NAME=\"id\" VALUE=\"$id\">\n";
    echo "<INPUT TYPE=\"submit\" NAME=\"submit\" VALUE=\"Delete\"><BR>\n";
    echo "</FORM>\n";
    exit;
}
echo "<H1><u>Current News</u></H1>\n";
$data = file('news.txt');
//next line removed to make everything else easier in the admin script
//$data = array_reverse($data);
foreach($data as $key=>$element) {
    $element = trim($element);
    $pieces = explode("|", $element);
    echo $pieces[2] . "<BR>" . "<b>Posted by " . $pieces[1] . " on " . $pieces[0] . "</b>\n";
    echo " <a href=\"$PHP_SELF?action=delete&id=$key\">Delete</a>\n";
    echo " <a href=\"$PHP_SELF?action=edit&id=$key\">Edit</a>\n";
    echo "<BR><BR>\n";
}
echo "<HR>\n";
echo "<H1><u>Add News</u></H1>\n";
if($HTTP_POST_VARS['submit']) {
    if($HTTP_POST_VARS['password'] == 'pass') {
        if(!$HTTP_POST_VARS['name']) {
            echo "You must enter a name";
            exit;
        }
        if(!$HTTP_POST_VARS['news']) {
            echo "You must enter some news";
            exit;
        }
        if(strstr($HTTP_POST_VARS['name'],"|")) {
            echo "Name cannot contain the pipe symbol - |";
            exit;
        }
        if(strstr($HTTP_POST_VARS['news'],"|")) {
            echo "News cannot contain the pipe symbol - |";
            exit;
        }
        $fp = fopen('news.txt','a');
        if(!$fp) {
            echo "Error opening file!";
            exit;
        }
        $line = date("m.d.y") . "|" . $HTTP_POST_VARS['name'];
        $line .= "|" . $HTTP_POST_VARS['news'];
        $line = str_replace("\r\n","<BR>",$line);
        $line .= "\r\n";
        fwrite($fp, $line);
        if(!fclose($fp)) {
            echo "Error closing file!";
            exit;
        }
        echo "<b>News added!</b>\n";   
    } else {
        echo "Bad Password";
    }
}
?>
<FORM ACTION="<?=$PHP_SELF?>" METHOD="POST" NAME="newsentry">
Your name:<BR>
<INPUT TYPE="text" SIZE="30" NAME="name"><BR>
The
News:<BR
>
<TEXTAREA NAME="news" COLS="40" ROWS="5"></TEXTAREA><BR><BR>
News Password:<BR>
<INPUT TYPE="password" SIZE="30" NAME="password"><BR>
<INPUT TYPE="submit" NAME="submit" VALUE="Post it!"><BR>
</FORM>


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