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# Helper functions

April 14, 2025 at 3:55 AM Edit on GitHub

# #getInput

The `getInput` function is used to receive a value for a parameter, specified in `const PARAMETERS`

    $this->getInput('your input name here');

`getInput` will either return the value for your parameter or `null` if the parameter is unknown or not specified.

Defined in lib/BridgeAbstract.php

# #getKey

The `getKey` function is used to receive the key name to a selected list value given the name of the list, specified in `const PARAMETERS` Is able to work with multidimensional list arrays.

    // Given a multidimensional array like this
    const PARAMETERS = [[
            'country' => [
                'name' => 'Country',
                'type' => 'list',
                'values' => [
                    'North America' => [
                        'Mexico' => 'mx',
                        'United States' => 'us'
                    ],
                    'South America' => [
                        'Uruguay' => 'uy',
                        'Venezuela' => 've'
                    ],
                ]
            ]
    ]],
    // Provide the list name to the function
    $this->getKey('country');
    // if the selected value was "ve", this function will return "Venezuela"

`getKey` will either return the key name for your parameter or `null` if the parameter is unknown or not specified.

Defined in lib/BridgeAbstract.php

# #getContents

The `getContents` function uses cURL to acquire data from the specified URI while respecting the various settings defined at a global level by RSS-Bridge (i.e., proxy host, user agent, etc.). This function accepts a few parameters:

Parameter | Type | Optional | Description
--- | --- | --- | ---
`url` | string | required | The URL of the contents to acquire
`header` | array | optional | An array of HTTP header fields to set, in the format `array('Content-type: text/plain', 'Content-length: 100')`, see CURLOPT_HTTPHEADER
`opts` | array | optional | An array of cURL options in the format `array(CURLOPT_POST => 1);`, see curl_setopt for a complete list of options.
`returnFull` | boolean | optional | Specifies whether to return the response body from cURL (default) or the response body, code, headers, etc.

    $header = array('Content-type:text/plain', 'Content-length: 100');
    $opts = array(CURLOPT_POST => 1);
    $html = getContents($url, $header, $opts);

Defined in lib/contents.php

# #getSimpleHTMLDOM

The `getSimpleHTMLDOM` function is a wrapper for the simple_html_dom file_get_html function in order to provide context by design.

    $html = getSimpleHTMLDOM('your URI');

Defined in lib/contents.php

# #getSimpleHTMLDOMCached

The `getSimpleHTMLDOMCached` function does the same as the `getSimpleHTMLDOM` function, except that the content received for the given URI is stored in a cache and loaded from cache on the next request if the specified cache duration was not reached.

Use this function for data that is very unlikely to change between consecutive requests to RSS-Bridge. This function allows to specify the cache duration with the second parameter.

    $html = getSimpleHTMLDOMCached('your URI', 86400); // Duration 24h

Defined in lib/contents.php

# #returnClientError

The `returnClientError` function aborts execution of the current bridge and returns the given error message with error code 400:

    returnClientError('Your error message')

Use this function when the user provided invalid parameter or a required parameter is missing.

Defined in lib/utils.php

# #returnServerError

The `returnServerError` function aborts execution of the current bridge and returns the given error message with error code 500:

    returnServerError('Your error message')

Use this function when a problem occurs that has nothing to do with the parameters provided by the user. (like: Host service gone missing, empty data received, etc…)

Defined in lib/utils.php

# #defaultLinkTo

Automatically replaces any relative URL in a given string or DOM object (i.e. the one returned by getSimpleHTMLDOM) with an absolute URL.

    defaultLinkTo ( mixed $content, string $server ) : object

Returns a DOM object (even if provided a string).

Remarks

- Only handles `<a>` and `<img>` tags.

Example

    $html = '<img src="/blob/master/README.md">';

    $html = defaultLinkTo($html, 'https://www.github.com/rss-bridge/rss-bridge'); // Using custom server
    $html = defaultLinkTo($html, $this->getURI()); // Using bridge URL

    // Output
    // <img src="https://www.github.com/rss-bridge/rss-bridge/blob/master/README.md">

Defined in lib/html.php

# #backgroundToImg

Replaces tags with styles of `backgroud-image` by `<img />` tags.

    backgroundToImg(mixed $htmlContent) : object

Returns a DOM object (even if provided a string).

Defined in lib/html.php

# #extractFromDelimiters

Extract the first part of a string matching the specified start and end delimiters.

    function extractFromDelimiters(string $string, string $start, string $end) : mixed

Returns the extracted string if delimiters were found and false otherwise.

Example

    $string = '<div>Post author: John Doe</div>';
    $start = 'author: ';
    $end = '<';
    $extracted = extractFromDelimiters($string, $start, $end);

    // Output
    // 'John Doe'

Defined in lib/html.php

# #stripWithDelimiters

Remove one or more part(s) of a string using a start and end delimiter. It is the inverse of `extractFromDelimiters`.

    function stripWithDelimiters(string $string, string $start, string $end) : string

Returns the cleaned string, even if no delimiters were found.

Example

    $string = 'foo<script>superscript()</script>bar';
    $start = '<script>';
    $end = '</script>';
    $cleaned = stripWithDelimiters($string, $start, $end);

    // Output
    // 'foobar'

Defined in lib/html.php

# #stripRecursiveHTMLSection

Remove HTML sections containing one or more sections using the same HTML tag.

    function stripRecursiveHTMLSection(string $string, string $tag_name, string $tag_start) : string

Example

    $string = 'foo<div class="ads"><div>ads</div>ads</div>bar';
    $tag_name = 'div';
    $tag_start = '<div class="ads">';
    $cleaned = stripRecursiveHTMLSection($string, $tag_name, $tag_start);

    // Output
    // 'foobar'

Defined in lib/html.php

# #markdownToHtml

Converts markdown input to HTML using Parsedown.

Parameter | Type | Optional | Description
--- | --- | --- | ---
`string` | string | required | The URL of the contents to acquire
`config` | array | optional | An array of Parsedown options in the format `['breaksEnabled' => true]`

Valid options:

Option | Default | Description
--- | --- | ---
`breaksEnabled` | `false` | Enable automatic line breaks
`markupEscaped` | `false` | Escape inline markup (HTML)
`urlsLinked` | `true` | Automatically convert URLs to links

    function markdownToHtml(string $string, array $config = []) : string

Example

    $input = <<<EOD
    RELEASE-2.8
     * Share QR code of a token
     * Dark mode improvemnet
     * Fix some layout issues
     * Add shortcut to launch the app with screenshot mode on
     * Translation improvements
    EOD;
    $html = markdownToHtml($input);

    // Output:
    // <p>RELEASE-2.8</p>
    // <ul>
    // <li>Share QR code of a token</li>
    // <li>Dark mode improvemnet</li>
    // <li>Fix some layout issues</li>
    // <li>Add shortcut to launch the app with screenshot mode on</li>
    // <li>Translation improvements</li>
    // </ul>

Defined in lib/html.php

# #e

The `e` function is used to convert special characters to HTML entities

    e('0 < 1 and 2 > 1');

`e` will return the content of the string escape that can be rendered as is in HTML

Defined in lib/html.php

# #truncate

The `truncate` function is used to shorten a string if exceeds a certain length, and add a string indicating that the string has been shortened.

    truncate('Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed a neque nunc. Nam nibh sem.', 20 , '...');

Defined in lib/html.php

# #sanitize

The `sanitize` function is used to remove some tags from a given HTML text.

    $html = '<head><title>Sample Page</title></head>
    <body><p>Lorem ipsum dolor sit amet, consectetur adipiscing elit...</p>
    <iframe src="https://www.example.com" width="600" height="400" frameborder="0" allowfullscreen></iframe>
    </body>
    </html>';
    $tags_to_remove = ['script', 'iframe', 'input', 'form'];
    $attributes_to_keep = ['title', 'href', 'src'];
    $text_to_keep = [];
    sanitize($html, $tags_to_remove, $attributes_to_keep, $text_to_keep);

This function returns a simplehtmldom object of the remaining contents.

Defined in lib/html.php

# #convertLazyLoading

The `convertLazyLoading` function is used to convert onvert lazy-loading images and frames (video embeds) into static elements. It accepts the HTML content as HTML objects or string objects. It returns the HTML content with fixed image/frame URLs (same type as input).

    $html = '<html>
    <body style="background-image: url('bgimage.jpg');">
    <h1>Hello world!</h1>
    </body>
    </html>
    backgroundToImg($html);

Defined in lib/html.php

# #Json::encode

The `Json::encode` function is used to encode a value as à JSON string.

    $array = [
        "foo" => "bar",
        "bar" => "foo",
    ];
    Json::encode($array, true, true);

Defined in lib/utils.php

# #Json::decode

The `Json::decode` function is used to decode a JSON string into à PHP variable.

    $json = '{
        "foo": "bar",
        "bar": "foo"
    }';
    Json::decode($json);

Defined in lib/utils.php