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<h1><a href="../Helper_functions/index.html">Helper functions</a></h1>
<span class="ModifiedDate">
January 4, 2025 at 10:00 AM </span>
<span class="EditOn">
<a href="https://github.com/RSS-Bridge/rss-bridge/tree/master/docs/06_Helper_functions/index.md" target="_blank">
Edit on GitHub </a>
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<h1><a id="getinput" href="#getinput" class="Permalink" aria-hidden="true" title="Permalink">#</a>getInput</h1>
<p>The <code>getInput</code> function is used to receive a value for a parameter, specified in <code>const PARAMETERS</code></p>
<pre><code class="language-PHP">$this->getInput('your input name here');
</code></pre>
<p><code>getInput</code> will either return the value for your parameter
or <code>null</code> if the parameter is unknown or not specified.</p>
<p><a href="https://github.com/RSS-Bridge/rss-bridge/blob/master/lib/BridgeAbstract.php" class="Link--external" rel="noopener noreferrer">Defined in lib/BridgeAbstract.php</a></p>
<h1><a id="getkey" href="#getkey" class="Permalink" aria-hidden="true" title="Permalink">#</a>getKey</h1>
<p>The <code>getKey</code> function is used to receive the key name to a selected list
value given the name of the list, specified in <code>const PARAMETERS</code>
Is able to work with multidimensional list arrays.</p>
<pre><code class="language-PHP">// 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"
</code></pre>
<p><code>getKey</code> will either return the key name for your parameter or <code>null</code> if the parameter
is unknown or not specified.</p>
<p><a href="https://github.com/RSS-Bridge/rss-bridge/blob/master/lib/BridgeAbstract.php" class="Link--external" rel="noopener noreferrer">Defined in lib/BridgeAbstract.php</a></p>
<h1><a id="getcontents" href="#getcontents" class="Permalink" aria-hidden="true" title="Permalink">#</a>getContents</h1>
<p>The <code>getContents</code> function uses <a href="https://secure.php.net/manual/en/book.curl.php" class="Link--external" rel="noopener noreferrer">cURL</a> 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:</p>
<table>
<thead>
<tr>
<th>Parameter</th>
<th>Type</th>
<th>Optional</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>url</code></td>
<td>string</td>
<td><em>required</em></td>
<td>The URL of the contents to acquire</td>
</tr>
<tr>
<td><code>header</code></td>
<td>array</td>
<td><em>optional</em></td>
<td>An array of HTTP header fields to set, in the format <code>array('Content-type: text/plain', 'Content-length: 100')</code>, see <a href="https://secure.php.net/manual/en/function.curl-setopt.php" class="Link--external" rel="noopener noreferrer">CURLOPT_HTTPHEADER</a></td>
</tr>
<tr>
<td><code>opts</code></td>
<td>array</td>
<td><em>optional</em></td>
<td>An array of cURL options in the format <code>array(CURLOPT_POST => 1);</code>, see <a href="https://secure.php.net/manual/en/function.curl-setopt.php" class="Link--external" rel="noopener noreferrer">curl_setopt</a> for a complete list of options.</td>
</tr>
<tr>
<td><code>returnFull</code></td>
<td>boolean</td>
<td><em>optional</em></td>
<td>Specifies whether to return the response body from cURL (default) or the response body, code, headers, etc.</td>
</tr>
</tbody>
</table>
<pre><code class="language-PHP">$header = array('Content-type:text/plain', 'Content-length: 100');
$opts = array(CURLOPT_POST => 1);
$html = getContents($url, $header, $opts);
</code></pre>
<p><a href="https://github.com/RSS-Bridge/rss-bridge/blob/master/lib/contents.php" class="Link--external" rel="noopener noreferrer">Defined in lib/contents.php</a></p>
<h1><a id="getsimplehtmldom" href="#getsimplehtmldom" class="Permalink" aria-hidden="true" title="Permalink">#</a>getSimpleHTMLDOM</h1>
<p>The <code>getSimpleHTMLDOM</code> function is a wrapper for the
<a href="https://simplehtmldom.sourceforge.io/" class="Link--external" rel="noopener noreferrer">simple_html_dom</a> <a href="https://simplehtmldom.sourceforge.io/docs/1.9/api/file_get_html/" class="Link--external" rel="noopener noreferrer">file_get_html</a> function in order to provide context by design.</p>
<pre><code class="language-PHP">$html = getSimpleHTMLDOM('your URI');
</code></pre>
<p><a href="https://github.com/RSS-Bridge/rss-bridge/blob/master/lib/contents.php" class="Link--external" rel="noopener noreferrer">Defined in lib/contents.php</a></p>
<h1><a id="getsimplehtmldomcached" href="#getsimplehtmldomcached" class="Permalink" aria-hidden="true" title="Permalink">#</a>getSimpleHTMLDOMCached</h1>
<p>The <code>getSimpleHTMLDOMCached</code> function does the same as the
<a href="#getsimplehtmldom"><code>getSimpleHTMLDOM</code></a> 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.</p>
<p>Use this function for data that is very unlikely to change between consecutive requests to <strong>RSS-Bridge</strong>.
This function allows to specify the cache duration with the second parameter.</p>
<pre><code class="language-PHP">$html = getSimpleHTMLDOMCached('your URI', 86400); // Duration 24h
</code></pre>
<p><a href="https://github.com/RSS-Bridge/rss-bridge/blob/master/lib/contents.php" class="Link--external" rel="noopener noreferrer">Defined in lib/contents.php</a></p>
<h1><a id="returnclienterror" href="#returnclienterror" class="Permalink" aria-hidden="true" title="Permalink">#</a>returnClientError</h1>
<p>The <code>returnClientError</code> function aborts execution of the current bridge
and returns the given error message with error code <strong>400</strong>:</p>
<pre><code class="language-PHP">returnClientError('Your error message')
</code></pre>
<p>Use this function when the user provided invalid parameter or a required parameter is missing.</p>
<p><a href="https://github.com/RSS-Bridge/rss-bridge/blob/master/lib/utils.php" class="Link--external" rel="noopener noreferrer">Defined in lib/utils.php</a></p>
<h1><a id="returnservererror" href="#returnservererror" class="Permalink" aria-hidden="true" title="Permalink">#</a>returnServerError</h1>
<p>The <code>returnServerError</code> function aborts execution of the current bridge and returns the given error message with error code <strong>500</strong>:</p>
<pre><code class="language-PHP">returnServerError('Your error message')
</code></pre>
<p>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…)</p>
<p><a href="https://github.com/RSS-Bridge/rss-bridge/blob/master/lib/utils.php" class="Link--external" rel="noopener noreferrer">Defined in lib/utils.php</a></p>
<h1><a id="defaultlinkto" href="#defaultlinkto" class="Permalink" aria-hidden="true" title="Permalink">#</a>defaultLinkTo</h1>
<p>Automatically replaces any relative URL in a given string or DOM object
(i.e. the one returned by <a href="#getsimplehtmldom">getSimpleHTMLDOM</a>) with an absolute URL.</p>
<pre><code class="hljs php">defaultLinkTo ( mixed $content, string $server ) : object
</code></pre>
<p>Returns a DOM object (even if provided a string).</p>
<p><strong>Remarks</strong></p>
<ul>
<li>Only handles <code><a></code> and <code><img></code> tags.</li>
</ul>
<p><strong>Example</strong></p>
<pre><code class="hljs php">$html = <span class="hljs-string">'<img src="/blob/master/README.md">'</span>;
$html = defaultLinkTo($html, <span class="hljs-string">'https://www.github.com/rss-bridge/rss-bridge'</span>); <span class="hljs-comment">// Using custom server</span>
$html = defaultLinkTo($html, <span class="hljs-keyword">$this</span>->getURI()); <span class="hljs-comment">// Using bridge URL</span>
<span class="hljs-comment">// Output</span>
<span class="hljs-comment">// <img src="https://www.github.com/rss-bridge/rss-bridge/blob/master/README.md"></span>
</code></pre>
<p><a href="https://github.com/RSS-Bridge/rss-bridge/blob/master/lib/html.php" class="Link--external" rel="noopener noreferrer">Defined in lib/html.php</a></p>
<h1><a id="backgroundtoimg" href="#backgroundtoimg" class="Permalink" aria-hidden="true" title="Permalink">#</a>backgroundToImg</h1>
<p>Replaces tags with styles of <code>backgroud-image</code> by <code><img /></code> tags.</p>
<pre><code class="hljs php">backgroundToImg(mixed $htmlContent) : object
</code></pre>
<p>Returns a DOM object (even if provided a string).</p>
<p><a href="https://github.com/RSS-Bridge/rss-bridge/blob/master/lib/html.php" class="Link--external" rel="noopener noreferrer">Defined in lib/html.php</a></p>
<h1><a id="extractfromdelimiters" href="#extractfromdelimiters" class="Permalink" aria-hidden="true" title="Permalink">#</a>extractFromDelimiters</h1>
<p>Extract the first part of a string matching the specified start and end delimiters.</p>
<pre><code class="hljs php"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">extractFromDelimiters</span><span class="hljs-params">(string $string, string $start, string $end)</span> : <span class="hljs-title">mixed</span>
</span></code></pre>
<p>Returns the extracted string if delimiters were found and false otherwise.</p>
<p><strong>Example</strong></p>
<pre><code class="hljs php">$string = <span class="hljs-string">'<div>Post author: John Doe</div>'</span>;
$start = <span class="hljs-string">'author: '</span>;
$end = <span class="hljs-string">'<'</span>;
$extracted = extractFromDelimiters($string, $start, $end);
<span class="hljs-comment">// Output</span>
<span class="hljs-comment">// 'John Doe'</span>
</code></pre>
<p><a href="https://github.com/RSS-Bridge/rss-bridge/blob/master/lib/html.php" class="Link--external" rel="noopener noreferrer">Defined in lib/html.php</a></p>
<h1><a id="stripwithdelimiters" href="#stripwithdelimiters" class="Permalink" aria-hidden="true" title="Permalink">#</a>stripWithDelimiters</h1>
<p>Remove one or more part(s) of a string using a start and end delimiter.
It is the inverse of <code>extractFromDelimiters</code>.</p>
<pre><code class="hljs php"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">stripWithDelimiters</span><span class="hljs-params">(string $string, string $start, string $end)</span> : <span class="hljs-title">string</span>
</span></code></pre>
<p>Returns the cleaned string, even if no delimiters were found.</p>
<p><strong>Example</strong></p>
<pre><code class="hljs php">$string = <span class="hljs-string">'foo<script>superscript()</script>bar'</span>;
$start = <span class="hljs-string">'<script>'</span>;
$end = <span class="hljs-string">'</script>'</span>;
$cleaned = stripWithDelimiters($string, $start, $end);
<span class="hljs-comment">// Output</span>
<span class="hljs-comment">// 'foobar'</span>
</code></pre>
<p><a href="https://github.com/RSS-Bridge/rss-bridge/blob/master/lib/html.php" class="Link--external" rel="noopener noreferrer">Defined in lib/html.php</a></p>
<h1><a id="striprecursivehtmlsection" href="#striprecursivehtmlsection" class="Permalink" aria-hidden="true" title="Permalink">#</a>stripRecursiveHTMLSection</h1>
<p>Remove HTML sections containing one or more sections using the same HTML tag.</p>
<pre><code class="hljs php"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">stripRecursiveHTMLSection</span><span class="hljs-params">(string $string, string $tag_name, string $tag_start)</span> : <span class="hljs-title">string</span>
</span></code></pre>
<p><strong>Example</strong></p>
<pre><code class="hljs php">$string = <span class="hljs-string">'foo<div class="ads"><div>ads</div>ads</div>bar'</span>;
$tag_name = <span class="hljs-string">'div'</span>;
$tag_start = <span class="hljs-string">'<div class="ads">'</span>;
$cleaned = stripRecursiveHTMLSection($string, $tag_name, $tag_start);
<span class="hljs-comment">// Output</span>
<span class="hljs-comment">// 'foobar'</span>
</code></pre>
<p><a href="https://github.com/RSS-Bridge/rss-bridge/blob/master/lib/html.php" class="Link--external" rel="noopener noreferrer">Defined in lib/html.php</a></p>
<h1><a id="markdowntohtml" href="#markdowntohtml" class="Permalink" aria-hidden="true" title="Permalink">#</a>markdownToHtml</h1>
<p>Converts markdown input to HTML using <a href="https://parsedown.org/" class="Link--external" rel="noopener noreferrer">Parsedown</a>.</p>
<table>
<thead>
<tr>
<th>Parameter</th>
<th>Type</th>
<th>Optional</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>string</code></td>
<td>string</td>
<td><em>required</em></td>
<td>The URL of the contents to acquire</td>
</tr>
<tr>
<td><code>config</code></td>
<td>array</td>
<td><em>optional</em></td>
<td>An array of Parsedown options in the format <code>['breaksEnabled' => true]</code></td>
</tr>
</tbody>
</table>
<p>Valid options:</p>
<table>
<thead>
<tr>
<th>Option</th>
<th>Default</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>breaksEnabled</code></td>
<td><code>false</code></td>
<td>Enable automatic line breaks</td>
</tr>
<tr>
<td><code>markupEscaped</code></td>
<td><code>false</code></td>
<td>Escape inline markup (HTML)</td>
</tr>
<tr>
<td><code>urlsLinked</code></td>
<td><code>true</code></td>
<td>Automatically convert URLs to links</td>
</tr>
</tbody>
</table>
<pre><code class="hljs php"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">markdownToHtml</span><span class="hljs-params">(string $string, array $config = [])</span> : <span class="hljs-title">string</span>
</span></code></pre>
<p><strong>Example</strong></p>
<pre><code class="hljs php">$input = <span class="hljs-string"><<<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;</span>
$html = markdownToHtml($input);
<span class="hljs-comment">// Output:</span>
<span class="hljs-comment">// <p>RELEASE-2.8</p></span>
<span class="hljs-comment">// <ul></span>
<span class="hljs-comment">// <li>Share QR code of a token</li></span>
<span class="hljs-comment">// <li>Dark mode improvemnet</li></span>
<span class="hljs-comment">// <li>Fix some layout issues</li></span>
<span class="hljs-comment">// <li>Add shortcut to launch the app with screenshot mode on</li></span>
<span class="hljs-comment">// <li>Translation improvements</li></span>
<span class="hljs-comment">// </ul></span>
</code></pre>
<p><a href="https://github.com/RSS-Bridge/rss-bridge/blob/master/lib/html.php" class="Link--external" rel="noopener noreferrer">Defined in lib/html.php</a></p>
<h1><a id="e" href="#e" class="Permalink" aria-hidden="true" title="Permalink">#</a>e</h1>
<p>The <code>e</code> function is used to convert special characters to HTML entities</p>
<pre><code class="language-PHP">e('0 < 1 and 2 > 1');
</code></pre>
<p><code>e</code> will return the content of the string escape that can be rendered as is in HTML</p>
<p><a href="https://github.com/RSS-Bridge/rss-bridge/blob/master/lib/html.php" class="Link--external" rel="noopener noreferrer">Defined in lib/html.php</a></p>
<h1><a id="truncate" href="#truncate" class="Permalink" aria-hidden="true" title="Permalink">#</a>truncate</h1>
<p>The <code>truncate</code> function is used to shorten a string if exceeds a certain length, and add a string indicating that the string has been shortened.</p>
<pre><code class="language-PHP">truncate('Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed a neque nunc. Nam nibh sem.', 20 , '...');
</code></pre>
<p><a href="https://github.com/RSS-Bridge/rss-bridge/blob/master/lib/html.php" class="Link--external" rel="noopener noreferrer">Defined in lib/html.php</a></p>
<h1><a id="sanitize" href="#sanitize" class="Permalink" aria-hidden="true" title="Permalink">#</a>sanitize</h1>
<p>The <code>sanitize</code> function is used to remove some tags from a given HTML text.</p>
<pre><code class="language-PHP">$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, $text_to_keep);
</code></pre>
<p>This function returns a simplehtmldom object of the remaining contents.</p>
<p><a href="https://github.com/RSS-Bridge/rss-bridge/blob/master/lib/html.php" class="Link--external" rel="noopener noreferrer">Defined in lib/html.php</a></p>
<h1><a id="convertlazyloading" href="#convertlazyloading" class="Permalink" aria-hidden="true" title="Permalink">#</a>convertLazyLoading</h1>
<p>The <code>convertLazyLoading</code> function is used to convert onvert lazy-loading images and frames (video embeds) into static elements. It accepts the HTML content as HTML objects or string objects. It returns the HTML content with fixed image/frame URLs (same type as input).</p>
<pre><code class="language-PHP">$html = '<html>
<body style="background-image: url('bgimage.jpg');">
<h1>Hello world!</h1>
</body>
</html>
backgroundToImg($html);
</code></pre>
<p><a href="https://github.com/RSS-Bridge/rss-bridge/blob/master/lib/html.php" class="Link--external" rel="noopener noreferrer">Defined in lib/html.php</a></p>
<h1><a id="json-encode" href="#json-encode" class="Permalink" aria-hidden="true" title="Permalink">#</a>Json::encode</h1>
<p>The <code>Json::encode</code> function is used to encode a value as à JSON string.</p>
<pre><code class="language-PHP">$array = [
"foo" => "bar",
"bar" => "foo",
];
Json::encode($array, true, true);
</code></pre>
<p><a href="https://github.com/RSS-Bridge/rss-bridge/blob/master/lib/utils.php" class="Link--external" rel="noopener noreferrer">Defined in lib/utils.php</a></p>
<h1><a id="json-decode" href="#json-decode" class="Permalink" aria-hidden="true" title="Permalink">#</a>Json::decode</h1>
<p>The <code>Json::decode</code> function is used to decode a JSON string into à PHP variable.</p>
<pre><code class="language-PHP">$json = '{
"foo": "bar",
"bar": "foo"
}';
Json::decode($json);
</code></pre>
<p><a href="https://github.com/RSS-Bridge/rss-bridge/blob/master/lib/utils.php" class="Link--external" rel="noopener noreferrer">Defined in lib/utils.php</a></p>
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