Get WP Post Content Without the First Image

<?php
// THIS ONE IN THE THEME'S FUNCTIONS

function remove_first_image($the_string) {
    $count = substr_count($the_string, '<img');
    if ($count > 0) {
        $length = strlen($the_string);
        $imgBeg = strpos($the_string, '<img');
        $imgEnd = strpos($the_string, '>', $imgBeg);
        $chop = $length-$imgEnd;
        $new_content = substr($the_string, 0, $imgBeg) . substr($the_string, $imgEnd+1, $chop);
        $capcount = substr_count($new_content, '&#91;caption');
        if ($capcount > 0) {
            $length = strlen($new_content);
            $capBeg = strpos($new_content, '&#91;caption');
            $capClose = strpos($new_content, '/caption&#93;');
            $capEnd = strpos($new_content, '&#93;', $capClose);
            $chop = $length-$capEnd;
            $final_content = substr($new_content, 0, $capBeg) . substr($new_content, $capEnd+1, $chop);
            return $final_content;
        }
        else {
            return $new_content;
        }
    }
    else {
        return $the_string;
    }
}
?>

<?php
 // CALLING THE FUNCTION FROM THE LOOP
?>

<?php while ( have_posts() ) : the_post(); ?>
    <?php $old_content = get_the_content(); ?>
    <?php $new_content = remove_first_image($old_content); ?>
    <?php $display_content = apply_filters('the_content',$new_content); ?>
    <div class="your-content-class">
        <?php echo $display_content; ?>
    </div>
?>