WordPress Shortcode displaying as text

I originally posted this on the WordPress site on StackExchange on they told me to move it here.

I’m new to PHP and WordPress so this is probably an easy fix, but I have taken the shortcode provided by the plugin I’m using and placed it in numerous locations in the code, and it always displays the shortcode in plain text rather than the content expected.

I also tried the PHP code given by the plugin; it doesn’t show up as plain text, but the content doesn’t display either.

Here are the instructions the plugin gives me for using the shortcode and PHP code.

Place <?php DISPLAY_ULTIMATE_PLUS();?> in your theme codes or use the
shortcode [DISPLAY_ULTIMATE_PLUS] to display them wherever you want.

Also checked out the WordPress Documentation on this topic, and it seems to be saying the same thing as the plugin’s instructions. There is additional info about adding arguments, but if those are applicable here I am unaware of it; although I believe they are of no matter here.

Seem like something pretty simple

Here is my shortcodes.php file.

<?php
/**
 * WordPress API for creating bbcode like tags or what WordPress calls
 * "shortcodes." The tag and attribute parsing or regular expression code is
 * based on the Textpattern tag parser.
 *
 * A few examples are below:
 *
 * [shortcode /]
 * [shortcode foo="bar" baz="bing" /]
 * [shortcode foo="bar"]content[/shortcode]
 *
 * Shortcode tags support attributes and enclosed content, but does not entirely
 * support inline shortcodes in other shortcodes. You will have to call the
 * shortcode parser in your function to account for that.
 *
 * {@internal
 * Please be aware that the above note was made during the beta of WordPress 2.6
 * and in the future may not be accurate. Please update the note when it is no
 * longer the case.}}
 *
 * To apply shortcode tags to content:
 *
 *     $out = do_shortcode( $content );
 *
 * @link https://codex.wordpress.org/Shortcode_API
 *
 * @package WordPress
 * @subpackage Shortcodes
 * @since 2.5.0
 */

/**
 * Container for storing shortcode tags and their hook to call for the shortcode
 *
 * @since 2.5.0
 *
 * @name $shortcode_tags
 * @var array
 * @global array $shortcode_tags
 */
$shortcode_tags = array();

/**
 * Add hook for shortcode tag.
 *
 * There can only be one hook for each shortcode. Which means that if another
 * plugin has a similar shortcode, it will override yours or yours will override
 * theirs depending on which order the plugins are included and/or ran.
 *
 * Simplest example of a shortcode tag using the API:
 *
 *     // [footag foo="bar"]
 *     function footag_func( $atts ) {
 *         return "foo = {
 *             $atts[foo]
 *         }";
 *     }
 *     add_shortcode( 'footag', 'footag_func' );
 *
 * Example with nice attribute defaults:
 *
 *     // [bartag foo="bar"]
 *     function bartag_func( $atts ) {
 *         $args = shortcode_atts( array(
 *             'foo' => 'no foo',
 *             'baz' => 'default baz',
 *         ), $atts );
 *
 *         return "foo = {$args['foo']}";
 *     }
 *     add_shortcode( 'bartag', 'bartag_func' );
 *
 * Example with enclosed content:
 *
 *     // [baztag]content[/baztag]
 *     function baztag_func( $atts, $content = '' ) {
 *         return "content = $content";
 *     }
 *     add_shortcode( 'baztag', 'baztag_func' );
 *
 * @since 2.5.0
 *
 * @uses $shortcode_tags
 *
 * @param string $tag Shortcode tag to be searched in post content.
 * @param callable $func Hook to run when shortcode is found.
 */
function add_shortcode($tag, $func) {
    global $shortcode_tags;

    if ( is_callable($func) )
        $shortcode_tags[$tag] = $func;
}

/**
 * Removes hook for shortcode.
 *
 * @since 2.5.0
 *
 * @uses $shortcode_tags
 *
 * @param string $tag Shortcode tag to remove hook for.
 */
function remove_shortcode($tag) {
    global $shortcode_tags;

    unset($shortcode_tags[$tag]);
}

/**
 * Clear all shortcodes.
 *
 * This function is simple, it clears all of the shortcode tags by replacing the
 * shortcodes global by a empty array. This is actually a very efficient method
 * for removing all shortcodes.
 *
 * @since 2.5.0
 *
 * @uses $shortcode_tags
 */
function remove_all_shortcodes() {
    global $shortcode_tags;

    $shortcode_tags = array();
}

/**
 * Whether a registered shortcode exists named $tag
 *
 * @since 3.6.0
 *
 * @global array $shortcode_tags List of shortcode tags and their callback hooks.
 *
 * @param string $tag Shortcode tag to check.
 * @return bool Whether the given shortcode exists.
 */
function shortcode_exists( $tag ) {
    global $shortcode_tags;
    return array_key_exists( $tag, $shortcode_tags );
}

/**
 * Whether the passed content contains the specified shortcode
 *
 * @since 3.6.0
 *
 * @global array $shortcode_tags
 *
 * @param string $content Content to search for shortcodes.
 * @param string $tag     Shortcode tag to check.
 * @return bool Whether the passed content contains the given shortcode.
 */
function has_shortcode( $content, $tag ) {
    if ( false === strpos( $content, '[' ) ) {
        return false;
    }

    if ( shortcode_exists( $tag ) ) {
        preg_match_all( '/' . get_shortcode_regex() . '/s', $content, $matches, PREG_SET_ORDER );
        if ( empty( $matches ) )
            return false;

        foreach ( $matches as $shortcode ) {
            if ( $tag === $shortcode[2] ) {
                return true;
            } elseif ( ! empty( $shortcode[5] ) && has_shortcode( $shortcode[5], $tag ) ) {
                return true;
            }
        }
    }
    return false;
}

/**
 * Search content for shortcodes and filter shortcodes through their hooks.
 *
 * If there are no shortcode tags defined, then the content will be returned
 * without any filtering. This might cause issues when plugins are disabled but
 * the shortcode will still show up in the post or content.
 *
 * @since 2.5.0
 *
 * @global array $shortcode_tags List of shortcode tags and their callback hooks.
 *
 * @param string $content Content to search for shortcodes.
 * @return string Content with shortcodes filtered out.
 */
function do_shortcode($content) {
    global $shortcode_tags;

    if ( false === strpos( $content, '[' ) ) {
        return $content;
    }

    if (empty($shortcode_tags) || !is_array($shortcode_tags))
        return $content;

    $pattern = get_shortcode_regex();
    return preg_replace_callback( "/$pattern/s", 'do_shortcode_tag', $content );
}

/**
 * Retrieve the shortcode regular expression for searching.
 *
 * The regular expression combines the shortcode tags in the regular expression
 * in a regex class.
 *
 * The regular expression contains 6 different sub matches to help with parsing.
 *
 * 1 - An extra [ to allow for escaping shortcodes with double [[]]
 * 2 - The shortcode name
 * 3 - The shortcode argument list
 * 4 - The self closing /
 * 5 - The content of a shortcode when it wraps some content.
 * 6 - An extra ] to allow for escaping shortcodes with double [[]]
 *
 * @since 2.5.0
 *
 * @uses $shortcode_tags
 *
 * @return string The shortcode search regular expression
 */
function get_shortcode_regex() {
    global $shortcode_tags;
    $tagnames = array_keys($shortcode_tags);
    $tagregexp = join( '|', array_map('preg_quote', $tagnames) );

    // WARNING! Do not change this regex without changing do_shortcode_tag() and strip_shortcode_tag()
    // Also, see shortcode_unautop() and shortcode.js.
    return
    '['                              // Opening bracket
    . '([?)'                           // 1: Optional second opening bracket for escaping shortcodes: [[tag]]
    . "($tagregexp)"                     // 2: Shortcode name
    . '(?![w-])'                       // Not followed by word character or hyphen
    . '('                                // 3: Unroll the loop: Inside the opening shortcode tag
    .     '[^]/]*'                   // Not a closing bracket or forward slash
    .     '(?:'
    .         '/(?!])'               // A forward slash not followed by a closing bracket
    .         '[^]/]*'               // Not a closing bracket or forward slash
    .     ')*?'
    . ')'
    . '(?:'
    .     '(/)'                        // 4: Self closing tag ...
    .     ']'                          // ... and closing bracket
    . '|'
    .     ']'                          // Closing bracket
    .     '(?:'
    .         '('                        // 5: Unroll the loop: Optionally, anything between the opening and closing shortcode tags
    .             '[^[]*+'             // Not an opening bracket
    .             '(?:'
    .                 '[(?!/2])' // An opening bracket not followed by the closing shortcode tag
    .                 '[^[]*+'         // Not an opening bracket
    .             ')*+'
    .         ')'
    .         '[/2]'             // Closing shortcode tag
    .     ')?'
    . ')'
    . '(]?)';                          // 6: Optional second closing brocket for escaping shortcodes: [[tag]]
}

/**
 * Regular Expression callable for do_shortcode() for calling shortcode hook.
 * @see get_shortcode_regex for details of the match array contents.
 *
 * @since 2.5.0
 * @access private
 * @uses $shortcode_tags
 *
 * @param array $m Regular expression match array
 * @return mixed False on failure.
 */
function do_shortcode_tag( $m ) {
    global $shortcode_tags;

    // allow [[foo]] syntax for escaping a tag
    if ( $m[1] == '[' && $m[6] == ']' ) {
        return substr($m[0], 1, -1);
    }

    $tag = $m[2];
    $attr = shortcode_parse_atts( $m[3] );

    if ( isset( $m[5] ) ) {
        // enclosing tag - extra parameter
        return $m[1] . call_user_func( $shortcode_tags[$tag], $attr, $m[5], $tag ) . $m[6];
    } else {
        // self-closing tag
        return $m[1] . call_user_func( $shortcode_tags[$tag], $attr, null,  $tag ) . $m[6];
    }
}

/**
 * Retrieve all attributes from the shortcodes tag.
 *
 * The attributes list has the attribute name as the key and the value of the
 * attribute as the value in the key/value pair. This allows for easier
 * retrieval of the attributes, since all attributes have to be known.
 *
 * @since 2.5.0
 *
 * @param string $text
 * @return array List of attributes and their value.
 */
function shortcode_parse_atts($text) {
    $atts = array();
    $pattern = '/(w+)s*=s*"([^"]*)"(?:s|$)|(w+)s*=s*'([^']*)'(?:s|$)|(w+)s*=s*([^s'"]+)(?:s|$)|"([^"]*)"(?:s|$)|(S+)(?:s|$)/';
    $text = preg_replace("/[x{00a0}x{200b}]+/u", " ", $text);
    if ( preg_match_all($pattern, $text, $match, PREG_SET_ORDER) ) {
        foreach ($match as $m) {
            if (!empty($m[1]))
                $atts[strtolower($m[1])] = stripcslashes($m[2]);
            elseif (!empty($m[3]))
            $atts[strtolower($m[3])] = stripcslashes($m[4]);
            elseif (!empty($m[5]))
            $atts[strtolower($m[5])] = stripcslashes($m[6]);
            elseif (isset($m[7]) && strlen($m[7]))
            $atts[] = stripcslashes($m[7]);
            elseif (isset($m[8]))
            $atts[] = stripcslashes($m[8]);
        }
    } else {
        $atts = ltrim($text);
    }
    return $atts;
}

/**
 * Combine user attributes with known attributes and fill in defaults when needed.
 *
 * The pairs should be considered to be all of the attributes which are
 * supported by the caller and given as a list. The returned attributes will
 * only contain the attributes in the $pairs list.
 *
 * If the $atts list has unsupported attributes, then they will be ignored and
 * removed from the final returned list.
 *
 * @since 2.5.0
 *
 * @param array $pairs Entire list of supported attributes and their defaults.
 * @param array $atts User defined attributes in shortcode tag.
 * @param string $shortcode Optional. The name of the shortcode, provided for context to enable filtering
 * @return array Combined and filtered attribute list.
 */
function shortcode_atts( $pairs, $atts, $shortcode = '' ) {
    $atts = (array)$atts;
    $out = array();
    foreach($pairs as $name => $default) {
        if ( array_key_exists($name, $atts) )
            $out[$name] = $atts[$name];
        else
            $out[$name] = $default;
    }
    /**
     * Filter a shortcode's default attributes.
     *
     * If the third parameter of the shortcode_atts() function is present then this filter is available.
     * The third parameter, $shortcode, is the name of the shortcode.
     *
     * @since 3.6.0
     *
     * @param array $out The output array of shortcode attributes.
     * @param array $pairs The supported attributes and their defaults.
     * @param array $atts The user defined shortcode attributes.
     */
    if ( $shortcode )
        $out = apply_filters( "shortcode_atts_{$shortcode}", $out, $pairs, $atts );

    return $out;
}

/**
 * Remove all shortcode tags from the given content.
 *
 * @since 2.5.0
 *
 * @uses $shortcode_tags
 *
 * @param string $content Content to remove shortcode tags.
 * @return string Content without shortcode tags.
 */
function strip_shortcodes( $content ) {
    global $shortcode_tags;

    if ( false === strpos( $content, '[' ) ) {
        return $content;
    }

    if (empty($shortcode_tags) || !is_array($shortcode_tags))
        return $content;

    $pattern = get_shortcode_regex();

    return preg_replace_callback( "/$pattern/s", 'strip_shortcode_tag', $content );
}

function strip_shortcode_tag( $m ) {
    // allow [[foo]] syntax for escaping a tag
    if ( $m[1] == '[' && $m[6] == ']' ) {
        return substr($m[0], 1, -1);
    }

    return $m[1] . $m[6];
}


Source: shortcode

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