diff --git a/system/Helpers/date_helper.php b/system/Helpers/date_helper.php
index 7a950883ef90..1eebabb6091b 100644
--- a/system/Helpers/date_helper.php
+++ b/system/Helpers/date_helper.php
@@ -47,7 +47,7 @@
 	 *
 	 * @return integer
 	 */
-	function now(string $timezone = null)
+	function now(string $timezone = null): int
 	{
 		$timezone = empty($timezone) ? app_timezone() : $timezone;
 
diff --git a/system/Helpers/number_helper.php b/system/Helpers/number_helper.php
index 7511cb049706..805f8a9f9e12 100644
--- a/system/Helpers/number_helper.php
+++ b/system/Helpers/number_helper.php
@@ -45,7 +45,7 @@
 	 * @param integer $precision
 	 * @param string  $locale
 	 *
-	 * @return string
+	 * @return boolean|string
 	 */
 	function number_to_size($num, int $precision = 1, string $locale = null)
 	{
@@ -178,7 +178,7 @@ function number_to_amount($num, int $precision = 0, string $locale = null)
 	 *
 	 * @return string
 	 */
-	function number_to_currency($num, string $currency, string $locale = null)
+	function number_to_currency($num, string $currency, string $locale = null): string
 	{
 		return format_number($num, 1, $locale, [
 			'type'     => NumberFormatter::CURRENCY,
@@ -202,7 +202,7 @@ function number_to_currency($num, string $currency, string $locale = null)
 	 *
 	 * @return string
 	 */
-	function format_number($num, int $precision = 1, string $locale = null, array $options = [])
+	function format_number($num, int $precision = 1, string $locale = null, array $options = []): string
 	{
 		// Locale is either passed in here, negotiated with client, or grabbed from our config file.
 		$locale = $locale ?? \CodeIgniter\Config\Services::request()->getLocale();
@@ -259,14 +259,14 @@ function format_number($num, int $precision = 1, string $locale = null, array $o
 	 *
 	 * @param integer $num it will convert to int
 	 *
-	 * @return string
+	 * @return string|null
 	 */
 	function number_to_roman($num)
 	{
 		$num = (int) $num;
 		if ($num < 1 || $num > 3999)
 		{
-			return;
+			return null;
 		}
 
 		$_number_to_roman = function ($num, $th) use (&$_number_to_roman) {
diff --git a/system/Helpers/security_helper.php b/system/Helpers/security_helper.php
index 047ea7facee1..7e67cf29b78c 100644
--- a/system/Helpers/security_helper.php
+++ b/system/Helpers/security_helper.php
@@ -45,7 +45,7 @@
 	 *
 	 * @return string
 	 */
-	function sanitize_filename(string $filename)
+	function sanitize_filename(string $filename): string
 	{
 		return Services::security()->sanitizeFilename($filename);
 	}
@@ -61,7 +61,7 @@ function sanitize_filename(string $filename)
 	 * @param  string $str
 	 * @return string
 	 */
-	function strip_image_tags(string $str)
+	function strip_image_tags(string $str): string
 	{
 		return preg_replace([
 			'#<img[\s/]+.*?src\s*=\s*(["\'])([^\\1]+?)\\1.*?\>#i',
diff --git a/system/Helpers/text_helper.php b/system/Helpers/text_helper.php
index 962f4d2ceb4c..52f61b2afc56 100755
--- a/system/Helpers/text_helper.php
+++ b/system/Helpers/text_helper.php
@@ -150,7 +150,7 @@ function ascii_to_entities(string $str): string
 			{
 				/*
 				  If the $temp array has a value but we have moved on, then it seems only
-				  fair that we output that entity and restart $temp before continuing. -Paul
+				  fair that we output that entity and restart $temp before continuing.
 				 */
 				if (count($temp) === 1)
 				{
@@ -281,7 +281,7 @@ function word_censor(string $str, $censored, string $replacement = ''): string
 		// \w, \b and a few others do not match on a unicode character
 		// set for performance reasons. As a result words like über
 		// will not match on a word boundary. Instead, we'll assume that
-		// a bad word will be bookeneded by any of these characters.
+		// a bad word will be bookended by any of these characters.
 		$delim = '[-_\'\"`(){}<>\[\]|!?@#%&,.:;^~*+=\/ 0-9\n\r\t]';
 
 		foreach ($censored as $badword)
@@ -402,7 +402,7 @@ function highlight_code(string $str): string
 	 *
 	 * @param string $str       the text string
 	 * @param string $phrase    the phrase you'd like to highlight
-	 * @param string $tag_open  the openging tag to precede the phrase with
+	 * @param string $tag_open  the opening tag to precede the phrase with
 	 * @param string $tag_close the closing tag to end the phrase with
 	 *
 	 * @return string
@@ -460,7 +460,7 @@ function convert_accented_characters(string $str): string
 	 * Anything placed between {unwrap}{/unwrap} will not be word wrapped, nor
 	 * will URLs.
 	 *
-	 * @param string  $str     the text string
+	 * @param string  $str             the text string
 	 * @param integer $charlim = 76    the number of characters to wrap at
 	 *
 	 * @return string
@@ -604,9 +604,9 @@ function ellipsize(string $str, int $max_length, $position = 1, string $ellipsis
 	 *
 	 * Removes slashes contained in a string or in an array
 	 *
-	 * @param mixed    string or array
+	 * @param mixed  $str  string or array
 	 *
-	 * @return mixed    string or array
+	 * @return mixed  string or array
 	 */
 	function strip_slashes($str)
 	{
@@ -632,7 +632,7 @@ function strip_slashes($str)
 	 *
 	 * Removes single and double quotes from a string
 	 *
-	 * @param string
+	 * @param string $str
 	 *
 	 * @return string
 	 */
@@ -651,7 +651,7 @@ function strip_quotes(string $str): string
 	 *
 	 * Converts single and double quotes to entities
 	 *
-	 * @param string
+	 * @param string $str
 	 *
 	 * @return string
 	 */
@@ -677,7 +677,7 @@ function quotes_to_entities(string $str): string
 	 *
 	 * http://www.some-site.com/index.php
 	 *
-	 * @param string
+	 * @param string $str
 	 *
 	 * @return string
 	 */
@@ -712,7 +712,7 @@ function reduce_multiples(string $str, string $character = ',', bool $trim = fal
 	{
 		$str = preg_replace('#' . preg_quote($character, '#') . '{2,}#', $character, $str);
 
-		return ($trim === true) ? trim($str, $character) : $str;
+		return ($trim) ? trim($str, $character) : $str;
 	}
 }
 
@@ -814,7 +814,7 @@ function alternator(): string
 
 		$args = func_get_args();
 
-		return $args[($i ++ % count($args))];
+		return $args[($i++ % count($args))];
 	}
 }
 
@@ -829,13 +829,13 @@ function alternator(): string
 	 *
 	 * @param string  $text     String to search the phrase
 	 * @param string  $phrase   Phrase that will be searched for.
-	 * @param integer $radius   The amount of characters returned arround the phrase.
+	 * @param integer $radius   The amount of characters returned around the phrase.
 	 * @param string  $ellipsis Ending that will be appended
 	 *
 	 * @return string
 	 *
 	 * If no $phrase is passed, will generate an excerpt of $radius characters
-	 * from the begining of $text.
+	 * from the beginning of $text.
 	 */
 	function excerpt(string $text, string $phrase = null, int $radius = 100, string $ellipsis = '...'): string
 	{
diff --git a/system/Helpers/url_helper.php b/system/Helpers/url_helper.php
index 399f0f5c6341..4fbaaaedc70c 100644
--- a/system/Helpers/url_helper.php
+++ b/system/Helpers/url_helper.php
@@ -334,7 +334,7 @@ function anchor_popup($uri = '', string $title = '', $attributes = false, \Confi
 	 */
 	function mailto($email, string $title = '', $attributes = ''): string
 	{
-		if ($title === '')
+		if (trim($title) === '')
 		{
 			$title = $email;
 		}
@@ -360,7 +360,7 @@ function mailto($email, string $title = '', $attributes = ''): string
 	 */
 	function safe_mailto($email, string $title = '', $attributes = ''): string
 	{
-		if ($title === '')
+		if (trim($title) === '')
 		{
 			$title = $email;
 		}
diff --git a/user_guide_src/source/helpers/number_helper.rst b/user_guide_src/source/helpers/number_helper.rst
index 77842e525e74..7e36c9e16558 100644
--- a/user_guide_src/source/helpers/number_helper.rst
+++ b/user_guide_src/source/helpers/number_helper.rst
@@ -109,7 +109,7 @@ The following functions are available:
 
     :param string $num: The number want to convert
     :returns: The roman number converted from given parameter
-    :rtype: string
+    :rtype: string|null
 
     Converts a number into roman::