PHP Code to Read Theme Information from Theme File Like Wordpress

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Hello Friends, Today I am going to share a PHP code to read theme information from theme file like WordPress do. WordPress reads theme information from style.css file of the theme but here in this code I’ll read theme information from “theme-info” file. I have developed this code today with the help of Google and WordPress Developer Resources for a project which is nothing but a custom CMS. So Here is the code..

themes.php

<?php

/** This code can be placed in another php file * */
$sys['theme'] = "theme1";//this value can be fetched from database

function getThemeData($file, $headers = array("name" => "Name")) {
    $file_data = file_get_contents($file);

    foreach ($headers as $field => $regex) {
        if (preg_match('/^[ \t\/*#@]*' . preg_quote($regex, '/') . ':(.*)$/mi', $file_data, $match) && $match[1]) {
            $headers[$field] = $match[1];
        } else {
            $headers[$field] = '';
        }
    }

    return $headers;
}

function getThemes() {
    global $sys;
    $themes = array();
    $dirs = glob('themes/*', GLOB_ONLYDIR);
    foreach ($dirs as $dir) {
        $screenshot = file_exists($dir . "/screenshot.png") ? $dir . "/screenshot.png" : "http://via.placeholder.com/400x400?text=No%20Screenshot";
        $theme = array(
            'path' => $dir,
            'folder' => basename($dir),
            'screenshot' => $screenshot,
            'name' => basename($dir)
        );
        if (file_exists($dir . "/theme-info")) {
            $theme_info = getThemeData($dir . "/theme-info", array("name" => "Name", "author" => "Author", "description" => "Description", "version" => "Version"));
            $theme['name'] = $theme_info['name'];
            $theme['author'] = $theme_info['author'];
            $theme['description'] = $theme_info['description'];
            $theme['version'] = $theme_info['version'];
        }

        $themes[] = $theme;
    }
    return $themes;
}
/** This code can be placed in another php file * */

$msg = "";
if (isset($_REQUEST['activate']) && trim($_REQUEST['activate'])) {
    $current_theme = filter_var(trim($_REQUEST['activate']), FILTER_SANITIZE_STRING);
    /*
     * Code to save active theme to database goes here     
     */
    $sys['theme'] = $current_theme;
    $msg = '<div class="alert alert-success">' . $current_theme . ' Theme Activated</div>';
}
$themes = getThemes();
?>
<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>Themes - Admin</title>
        <meta content='width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no' name='viewport'>
        <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/css/bootstrap.min.css">
    </head>
    <body>
        <div class="container">
            <div class="">
                <section class="">
                    <h1>
                        Themes
                    </h1>

                </section>
                <section class="">
                    <?= $msg ?>
                    <div class="row themes" id="themes">
                        <?php foreach ($themes as $theme) { ?>
                            <div class="col-xl-3 col-lg-4 col-md-4 col-sm-6 col-xs-12">
                                <div class="panel">
                                    <div class="panel-body">
                                        <img src="<?= $theme['screenshot'] ?>" class="img-responsive"/>
                                    </div>
                                    <div class="panel-footer">
                                        <b><?= $theme['name'] ?></b>
                                        <?php if ($sys['theme'] != $theme['folder']) { ?>
                                            <a href="themes.php?activate=<?= $theme['folder'] ?>" class="btn btn-default btn-xs pull-right">Activate</a>
                                            <?php
                                        } else {
                                            echo '<span class="pull-right">Activated</span>';
                                        }
                                        ?>
                                    </div>
                                </div>
                            </div>
                        <?php } ?>
                    </div>

                </section>
            </div>

        </div>

        <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js"></script>
        <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/js/bootstrap.min.js"></script>
    </body>
</html>

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<?php

/** This code can be placed in another php file * */

$sys['theme'] = "theme1";//this value can be fetched from database

function getThemeData($file, $headers = array("name" => "Name")) {

$file_data = file_get_contents($file);

foreach ($headers as $field => $regex) {

if (preg_match('/^[ \t\/*#@]*' . preg_quote($regex, '/') . ':(.*)$/mi', $file_data, $match) && $match[1]) {

$headers[$field] = $match[1];

} else {

$headers[$field] = '';

}

return $headers;

}

function getThemes() {

global $sys;

$themes = array();

$dirs = glob('themes/*', GLOB_ONLYDIR);

foreach ($dirs as $dir) {

$screenshot = file_exists($dir . "/screenshot.png") ? $dir . "/screenshot.png" : "http://via.placeholder.com/400x400?text=No%20Screenshot";

$theme = array(

'path' => $dir,

'folder' => basename($dir),

'screenshot' => $screenshot,

'name' => basename($dir)

);

if (file_exists($dir . "/theme-info")) {

$theme_info = getThemeData($dir . "/theme-info", array("name" => "Name", "author" => "Author", "description" => "Description", "version" => "Version"));

$theme['name'] = $theme_info['name'];

$theme['author'] = $theme_info['author'];

$theme['description'] = $theme_info['description'];

$theme['version'] = $theme_info['version'];

}

$themes[] = $theme;

}

return $themes;

}

/** This code can be placed in another php file * */

$msg = "";

if (isset($_REQUEST['activate']) && trim($_REQUEST['activate'])) {

$current_theme = filter_var(trim($_REQUEST['activate']), FILTER_SANITIZE_STRING);

* Code to save active theme to database goes here

$sys['theme'] = $current_theme;

$msg = '<div class="alert alert-success">' . $current_theme . ' Theme Activated</div>';

}

$themes = getThemes();

<!DOCTYPE html>

<html>

<head>

<title>Themes - Admin</title>

</head>

<body>

<h1>

Themes

</h1>

</section>

<?= $msg ?>

<?php foreach ($themes as $theme) { ?>

<img src="<?= $theme['screenshot'] ?>" class="img-responsive"/>

</div>

<?php if ($sys['theme'] != $theme['folder']) { ?>

<a href="themes.php?activate=<?= $theme['folder'] ?>" class="btn btn-default btn-xs pull-right">Activate</a>

<?php

} else {

echo '<span class="pull-right">Activated</span>';

}

</div>

<?php } ?>

</div>

</section>

</div>

</body>

</html>

Directory Structure:

Directory Structure

Output:

Theme Information Reader Output 1

Theme Information Reader Output 2

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