Scrivere in una posizione specifica di un file

[goikiu]

Fonte: http://www.php.net/manual/it/function.fopen.php

While PHP does not have a function to insert text into the middle of a file, it is not that complicated to do.

<?php
function addRSSItem($rssFile, $firstItem, $item){
    // Backup file
    if(!copy($rssFile, 'backup.rss')) die('Backup failed!');
    // Store file contents in array
    $arrFile = file($rssFile);
    // Open file for output
    if(($fh = fopen($rssFile,'w')) === FALSE){
        die('Failed to open file for writing!');
    }
    // Set counters
    $currentLine = 0;
    $cntFile = count($arrFile);
    // Write contents, inserting $item as first item
    while( $currentLine <= $cntFile ){
        if($currentLine == $firstItem) fwrite($fh, $item);
        fwrite($fh, $arrFile[$currentLine]);
        $currentLine++;
    }
    // Delete backup
    unlink('backup.rss');
}

$data = "    <item>\n<title>$_POST['title]</title>\n".
  "        <description>$_POST['description']</description>\n".
  "        <pubDate>$_POST['date']</pubDate>\n".
  "        <link>[url]http://www.site.com/mp3s/[/url]".
  basename($_FILES['fullPath']['name'])."</link>".
  "        <enclosure url=\"http://www.site.com/mp3s/".
  basename($_FILES['fullPath']['name']).
  "\" length=\"$_FILES[fullPath][size]\" type=\"audio/mpeg\" />".
  "    </item>\n";
addRSSItem('/var/www/html/rss/podcast.rss',20,$data);
?>