This is the source code for the blog running on my website

ts-BMS.php

<?php
function blog_printDatabaseEcho($entryData, $type = "default") {
    if($type == "default") {
        echo '<a href="/blog/entry/'.$entryData["filename"].'" class="entry-card white">'.'<h2 class="title">'.$entryData["title"].'</h3>'.'<p class="details">'.blog_timeparser($entryData["time"][0]).'<br>';
        blog_tagsDisplayAllTags($entryData["tags"]); echo '</p>';
        echo '</a>';
    } elseif ($type == "rss") {
        echo "    <entry>\n";
		echo '        <title>'.$entryData["title"].'</title>'."\n";
		echo '        <link type="text/html" href="https://www.technosparks.net/blog/entry/'.$entryData["filename"].'"/>'."\n";
		echo '        <updated>'.blog_timeparser($entryData["time"][0], "rss").'</updated>'."\n";
		echo '        <content type="xhtml">'."\n";
        echo '            <div xmlns="http://www.w3.org/1999/xhtml">'."\n";
        echo '                <p><a href="https://www.technosparks.net/blog/entry/'.$entryData[1].'">Read this entry</a></p>'."\n";
        echo '            </div>'."\n";
        echo '        </content>'."\n";
		echo '        <author><name>Shahmi Saidi</name></author>'."\n";
		echo "    </entry>\n\n";
    }
}

function blog_printDatabase($type = "default") {
    $fp = fopen("entries-list.txt", "r");
    // Check for total number of entries
    $entries = 0; $fpEntryofPg = []; $fpEntryofPgi = 1;
    while(!feof($fp)) {
        // Line 1
        $fpBefore = ftell($fp);
        if(empty(fgets($fp))) { break; }
        // Line 2
        if(fgets($fp) == "wip\n") {
            if(!isset($_GET["all"])) {
                $entries--;
            }
        }
        if($entries % 6 == 0) {
            $fpEntryofPg[$fpEntryofPgi++] = $fpBefore;
        }
        // Line 3 - 7
        for($i = 1; $i <= 5; $i++) {
            fgets($fp);
        }
        $entries++;
    }
    // Handle pagination
    $maxPages = ceil($entries / 6);
    if(!empty($_GET["page"])) { $page = $_GET["page"]; } else { $page = 1; }
    if($page > $maxPages || $page <= 0) {
        echo '<section>'.infobox("warn", ($page < 0 ? 'There&apos;s no such thing as negative pages! ' : '').'You attempted to access a page (page '.$page.') which does not exist! Showing you page 1 instead.').'</section>';
        $page = 1;
    }
    // Output entries based on page
    fseek($fp, $fpEntryofPg[$page]);
    echo '<section class="bloglist">';
    for($entry = 1; $entry <= 6; $entry++) {
        // Line 1
        if(empty(fgets($fp))) { break; }
        // Line 2
        if(fgets($fp) == "wip\n") {
            if(!isset($_GET["all"])) {
                for($i = 1; $i <= 5; $i++) {
                    fgets($fp);
                }
                $entry--;
                continue;
            }
        }
        // Line 3
        $entryData["time"] = explode(" ", trim(fgets($fp), "\n"));
        // Line 4
        $entryData["filename"] = trim(fgets($fp), "\n");
        // Line 5
        $entryData["title"] = trim(fgets($fp), "\n");
        // Line 6
        $entryData["tags"] = explode(", ", trim(fgets($fp), "\n"));
        // Line 7
        fgets($fp);
        blog_printDatabaseEcho($entryData, $type);
    }
    echo '</section>';
    fclose($fp);
    // Display pagination controls
    if($type == "default") {
        echo '<section style="text-align: center">';
        echo '<a class="blog pagination button-link" href="?page='.($page - 1).((isset($_GET["all"])) ? '&all' : '').'" style="min-width: initial; visibility: ' . ($page > 1 ? 'visible' : 'hidden') . ';"><i class="fa fa-chevron-left"></i></a> ';
        echo '<span class="blog pagination">Page ' . $page . '</span> ';
        echo '<a class="blog pagination button-link" href="?page=' . ($page + 1) . ((isset($_GET["all"])) ? '$all' : '') . '" style="min-width: initial; visibility: ' . ($page < $maxPages ? 'visible' : 'hidden') . ';"><i class="fa fa-chevron-right"></i></a> ';
        echo '</section>';
    } elseif($type == "rss") {
        if($page > 1) {
            echo '<link rel="previous" href="https://www.technosparks.net/blog/atom-feed?page='.($page + 1).'"/>';
        }
        if($page < $maxPages) {
            echo '<link rel="next" href="https://www.technosparks.net/blog/atom-feed?page='.($page - 1).'"/>';
        }
    }
}

function blog_processEntry($entryRequested) {
    global $pgconfig_title, $blogSubtitle, $timestamp;
    $entryFound = false;
    $fp = fopen("entries-list.txt", "r");
    while(!feof($fp)) {
        // Line 1
        $fpEntry = ftell($fp);
        if(empty(fgets($fp))) { break; }
        // Line 2 - 3
        fgets($fp); fgets($fp);
        // Line 4
        if(trim(fgets($fp), "\n") == $entryRequested) {
            $entryFound = true;
            break;
        }
        // Line 5 - 7
        fgets($fp); fgets($fp); fgets($fp);
    }
    if($entryFound == false) {
        fclose($fp);
        redirect(404);
    }
    fseek($fp, $fpEntry);
    // Line 1 - 2
    fgets($fp); fgets($fp);
    // Line 3
    $timestamp = explode(" ", trim(fgets($fp), "\n"));
    // Line 4
    fgets($fp);
    // Line 5
    $pgconfig_title = trim(fgets($fp), "\n");
    // Line 6
    fgets($fp);
    // Line 7
    $blogSubtitle = trim(fgets($fp), "\n");
    fclose($fp);
}

function blog_timeparser($timestamp, $type = "standard") {
    if(empty($timestamp)) return null;
    if($type == "standard") {
        $fullDate = date("l d F Y h:ia", $timestamp);
    } elseif($type == "rss") {
        $fullDate = date(DATE_ATOM, $timestamp);
    } elseif($type == "blog-header") {
        $fullDate = [ "d" => date("d", $timestamp), "m" => date("M", $timestamp), "y" => date("Y", $timestamp)];
    }
    return $fullDate;
}

function blog_tagsGetEntries($needtag = "") {
    if(empty($needtag)) { return false; } else { $needtag = urldecode($needtag); }
    $entryFound = false;
    $fp = fopen("entries-list.txt", "r");
    $entries = 0; $fpEntry = []; $fpEntryofPg = []; $fpEntryofPgi = 0; $fpEntryi = 0;
    while(!feof($fp)) {
        // Line 1
        $fpBefore = ftell($fp);
        if(empty(fgets($fp))) { break; }
        // Line 2
        if(fgets($fp) == "wip\n") {
            if(!isset($_GET["all"])) {
                for($i = 1; $i <= 5; $i++) {
                    fgets($fp);
                }
                continue;
            }
        }
        // Line 3 - 5
        fgets($fp); fgets($fp); fgets($fp);
        // Line 6
        $tags = explode(", ", trim(fgets($fp), "\n"));
        foreach($tags as $tag) {
            if($tag == $needtag) {
                $fpEntry[$fpEntryi++] = $fpBefore;
                $entryFound = true;
                break;
            }
        }
        // Line 7
        fgets($fp);
    }
    if($entryFound == true) {
        $entries = count($fpEntry);
        $maxPages = ceil($entries / 6);
        if(isset($_GET["page"])) { $page = $_GET["page"]; } else { $page = 1; }
        if($page > $maxPages || $page <= 0) {
            echo '<section>'.infobox("warn", ($page < 0 ? 'There&apos;s no such thing as negative pages! ' : '').'You attempted to access a page (page '.$page.') which does not exist! Showing you page 1 instead.').'</section>';
            $page = 1;
        }
        $fpEntryi = ($page - 1) * 6;
        $fpEntryMax = $fpEntryi + 5;
        while($fpEntryi < $entries && $fpEntryi < $fpEntryMax) {
            fseek($fp, $fpEntry[$fpEntryi]);
            // Line 1 - 2
            fgets($fp); fgets($fp);
            // Line 3
            $entryData["time"] = explode(" ", trim(fgets($fp), "\n"));
            // Line 4
            $entryData["filename"] = trim(fgets($fp), "\n");
            // Line 5
            $entryData["title"] = trim(fgets($fp), "\n");
            // Line 6
            $entryData["tags"] = explode(", ", trim(fgets($fp), "\n"));
            // Line 7
            fgets($fp);
            blog_printDatabaseEcho($entryData, "default");

            $fpEntryi++;
        }
        echo '<section style="text-align: center">';
        echo '<a class="blog pagination button-link" href="?page='.($page - 1).((isset($_GET["all"])) ? '$all' : '').'" style="min-width: initial; visibility: ' . ($page > 1 ? 'visible' : 'hidden') . ';"><i class="fa fa-chevron-left"></i></a> ';
        echo '<span class="blog pagination">Page ' . $page . '</span> ';
        echo '<a class="blog pagination button-link" style="min-width: initial;" href="?page=' . ($page + 1) . ((isset($_GET["all"])) ? '$all' : '') . '" style="min-width: initial; visibility: ' . ($page < $maxPages ? 'visible' : 'hidden') . ';"><i class="fa fa-chevron-right"></i></a> ';
        echo '</section>';
    } else {
        echo '<section>'.infobox("notify", 'Unfortunately, there are no articles with the tag “'.$needtag.'”').'</section>';
    }
    fclose($fp);
}

function blog_tagsListAllTags() {
    $tags = [];
    $tagsi = 0;
    $fp = fopen("entries-list.txt", "r");
    while(!feof($fp)) {
        // Line 1
        if(empty(fgets($fp))) { break; }
        // Line 2
        if(fgets($fp) == "wip\n") {
            if(!isset($_GET["all"])) {
                for($i = 1; $i <= 5; $i++) {
                    fgets($fp);
                }
                continue;
            }
        }
        // Line 3 - 5
        fgets($fp); fgets($fp); fgets($fp);
        // Line 6
        $tagsfromEntry = explode(", ", trim(fgets($fp), "\n"));
        foreach($tagsfromEntry as $tagsfromEntry) {
            $tags[$tagsi++] = $tagsfromEntry;
        }
        // Line 7
        fgets($fp);
    }
    fclose($fp);
    $tags = array_unique($tags);
    sort($tags);
    foreach($tags as $tag) {
        echo '<a href="?find='.urlencode($tag).((isset($_GET["all"])) ? '$all' : '').'" class="button-link" style="background-color: #6891bb;">'.$tag.'</a>';
    }
}

function blog_tagsDisplayAllTags($tags) {
    if(isset($_GET["all"])) $appendViewAll = "$all"; else $appendViewAll = "";
    $arrSize = count($tags);
    for($i = 0; $i < $arrSize; $i++) {
        echo $tags[$i];
        if($i + 1 != $arrSize) { echo ", "; }
    }
}