diff --git a/common/functions.php b/common/functions.php
index 2f08f66f1..eddbcd2e6 100644
--- a/common/functions.php
+++ b/common/functions.php
@@ -6,6 +6,428 @@
  * Copyright (c) Rhymix Developers and Contributors
  */
 
+
+/** Get the first value of an array.
+ * 
+ * @param array $array The input array
+ * @return mixed
+ */
+function array_first(array $array)
+{
+	return reset($array);
+}
+
+/** Get the first key of an array.
+ * 
+ * @param array $array The input array
+ * @return mixed
+ */
+function array_first_key(array $array)
+{
+	reset($array);
+	return key($array);
+}
+
+/** Get the last value of an array.
+ * 
+ * @param array $array The input array
+ * @return mixed
+ */
+function array_last(array $array)
+{
+	return end($array);
+}
+
+/** Get the last key of an array.
+ * 
+ * @param array $array The input array
+ * @return mixed
+ */
+function array_last_key(array $array)
+{
+	end($array);
+	return key($array);
+}
+
+/**
+ * Flatten a multi-dimensional array into a one-dimensional array.
+ * Based on util.php <https://github.com/brandonwamboldt/utilphp>
+ * Contributed by Theodore R. Smith of PHP Experts, Inc. <http://www.phpexperts.pro/>
+ *
+ * @param array $array The array to flatten
+ * @param bool $preserve_keys Whether or not to preserve array keys (default: true)
+ * @return array
+ */
+function array_flatten(array $array, $preserve_keys = true)
+{
+	$result = array();
+	array_walk_recursive($array, function($value, $key) use(&$result, $preserve_keys) {
+		if ($preserve_keys && !is_int($key))
+		{
+			$result[$key] = $value;
+		}
+		else
+		{
+			$result[] = $value;
+		}
+	});
+	return $result;
+}
+
+/**
+ * Get the base name of a class name (without namespaces).
+ * Based on Laravel helper function <http://laravel.com/docs/5.0/helpers>
+ * 
+ * @param string|object $class The class name
+ * @return string
+ */
+function class_basename($class)
+{
+	return basename(str_replace('\\', '/', is_object($class) ? get_class($class) : $class));
+}
+
+/**
+ * This function is a shortcut to htmlspecialchars().
+ * 
+ * @param string $str The string to escape
+ * @param bool $double_escape Set this to false to skip symbols that are already escaped (default: true)
+ * @return string
+ */
+function escape($str, $double_escape = true)
+{
+	$flags = defined('ENT_SUBSTITUTE') ? (ENT_QUOTES | ENT_SUBSTITUTE) : (ENT_QUOTES | ENT_IGNORE);
+	return htmlspecialchars($str, $flags, 'UTF-8', $double_escape);
+}
+
+/**
+ * This function escapes a string to be used in a CSS property.
+ * 
+ * @param string $str The string to escape
+ * @return string
+ */
+function escape_css($str)
+{
+	return preg_replace('/[^a-zA-Z0-9_.#\/-]/', '', $str);
+}
+
+/**
+ * This function escapes a string to be used in a JavaScript string literal.
+ * 
+ * @param string $str The string to escape
+ * @return string
+ */
+function escape_js($str)
+{
+	$flags = JSON_HEX_TAG | JSON_HEX_AMP | JSON_HEX_APOS | JSON_HEX_QUOT;
+	if (defined('JSON_UNESCAPED_UNICODE')) $flags = $flags | JSON_UNESCAPED_UNICODE;
+	$str = json_encode((string)$str, $flags);
+	return substr($str, 1, strlen($str) - 2);
+}
+
+/**
+ * This function escapes a string to be used in a 'single-quoted' PHP string literal.
+ * Null bytes are removed.
+ * 
+ * @param string $str The string to escape
+ * @return string
+ */
+function escape_sqstr($str)
+{
+	return str_replace(array('\\0', '\\"'), array('', '"'), addslashes($str));
+}
+
+/**
+ * This function escapes a string to be used in a "double-quoted" PHP string literal.
+ * Null bytes are removed.
+ * 
+ * @param string $str The string to escape
+ * @return string
+ */
+function escape_dqstr($str)
+{
+	return str_replace(array('\\0', "\\'", '$'), array('', "'", '\\$'), addslashes($str));
+}
+
+/**
+ * This function splits a string into an array, but allows the delimter to be escaped.
+ * For example, 'A|B\|C|D' will be split into 'A', 'B|C', and 'D'
+ * because the bar between B and C is escaped.
+ * 
+ * @param string $delimiter The delimiter
+ * @param string $str The string to split
+ * @param int $limit The maximum number of items to return, 0 for unlimited (default: 0)
+ * @param string $escape_char The escape character (default: backslash)
+ * @return array
+ */
+function explode_with_escape($delimiter, $str, $limit = 0, $escape_char = '\\')
+{
+	if ($limit < 1) $limit = null;
+	$result = [];
+	$split = preg_split('/(?<!' . preg_quote($escape_char, '/') . ')' . preg_quote($delimiter, '/') . '/', $str, $limit);
+	foreach ($split as $piece)
+	{
+		if (trim($piece) !== '')
+		{
+			$result[] = trim(str_replace($escape_char . $delimiter, $delimiter, $piece));
+		}
+	}
+	return $result;
+}
+
+/**
+ * This function returns true if $haystack starts with $needle, and false otherwise.
+ * 
+ * @param string $needle The needle
+ * @param string $haystack The haystack
+ * @param bool $case_sensitive Whether the search should be case-sensitive (default: true)
+ * @return bool
+ */
+function starts_with($needle, $haystack, $case_sensitive = true)
+{
+	if (strlen($needle) > strlen($haystack)) return false;
+	if ($case_sensitive)
+	{
+		return !strncmp($needle, $haystack, strlen($needle));
+	}
+	else
+	{
+		!strncasecmp($needle, $haystack, strlen($needle));
+	}
+}
+
+/**
+ * This function returns true if $haystack ends with $needle, and false otherwise.
+ * 
+ * @param string $needle The needle
+ * @param string $haystack The haystack
+ * @param bool $case_sensitive Whether the search should be case-sensitive (default: true)
+ * @return bool
+ */
+function ends_with($needle, $haystack, $case_sensitive = true)
+{
+	if (strlen($needle) > strlen($haystack)) return false;
+	if ($case_sensitive)
+	{
+		return (substr($haystack, -strlen($needle)) === $needle);
+	}
+	else
+	{
+		return (strtolower(substr($haystack, -strlen($needle))) === strtolower($needle));
+	}
+}
+
+/**
+ * This function returns true if $haystack contains $needle, and false otherwise.
+ * 
+ * @param string $needle The needle
+ * @param string $haystack The haystack
+ * @param bool $case_sensitive Whether the search should be case-sensitive (default: true)
+ * @return bool
+ */
+function contains($needle, $haystack, $case_sensitive = true)
+{
+	return $case_sensitive ? (strpos($haystack, $needle) !== false) : (stripos($haystack, $needle) !== false);
+}
+
+/**
+ * This function returns true if $needle is between $min and $max, and false otherwise.
+ * Non-numeric values are compared according to PHP defaults.
+ * 
+ * @param mixed $needle The needle
+ * @param mixed $min The minimum value
+ * @param mixed $max The maximum value
+ * @param bool $exclusive Set this to true to exclude endpoints (default: false)
+ * @return bool
+ */
+function is_between($needle, $min, $max, $exclusive = false)
+{
+	if ($exclusive)
+	{
+		return ($needle > $min && $needle < $max);
+	}
+	else
+	{
+		return ($needle >= $min && $needle <= $max);
+	}
+}
+
+/**
+ * This function restricts $input to be between $min and $max.
+ * All values less than $min are converted to $min, and all values greater than $max are converted to $max.
+ * Non-numeric values are compared according to PHP defaults.
+ * 
+ * @param mixed $input The value to convert
+ * @param mixed $min The minimum value
+ * @param mixed $max The maximum value
+ * @return mixed
+ */
+function force_range($input, $min, $max)
+{
+	if ($input < $min) $input = $min;
+	if ($input > $max) $input = $max;
+	return $input;
+}
+
+/**
+ * This function encodes a string with base64, using a URL-safe character set.
+ * 
+ * @param string $str The string to encode
+ * @return string
+ */
+function base64_encode_urlsafe($str)
+{
+	return strtr(rtrim(base64_encode($str), '='), '+/', '-_');
+}
+
+/**
+ * This function decodes a string with base64, using a URL-safe character set.
+ * 
+ * @param string $str The string to decode
+ * @return string
+ */
+function base64_decode_urlsafe($str)
+{
+	return @base64_decode(str_pad(strtr($str, '-_', '+/'), ceil(strlen($str) / 4) * 4, '=', STR_PAD_RIGHT));
+}
+
+/**
+ * Convert hexadecimal color codes to an array of R, G, B values.
+ * This function can handle both 6-digit and 3-digit notations, optionally prefixed with '#'.
+ * If the color code is illegal, this function will return all nulls.
+ * 
+ * @param string $hex The color to convert
+ * @return array
+ */
+function hex2rgb($hex)
+{
+	$hex = ltrim($hex, '#');
+	if (strlen($hex) == 3)
+	{
+		$r = hexdec(substr($hex, 0, 1) . substr($hex, 0, 1));
+		$g = hexdec(substr($hex, 1, 1) . substr($hex, 1, 1));
+		$b = hexdec(substr($hex, 2, 1) . substr($hex, 2, 1));
+	}
+	elseif (strlen($hex) == 6)
+	{
+		$r = hexdec(substr($hex, 0, 2));
+		$g = hexdec(substr($hex, 2, 2));
+		$b = hexdec(substr($hex, 4, 2));
+	}
+	else
+	{
+		$r = $g = $b = null;
+	}
+	return array($r, $g, $b);
+}
+
+/**
+ * Convert an array of R, G, B values to hexadecimal color codes.
+ * If the RGB values are illegal, this function will return #000000.
+ * 
+ * @param array $rgb The color to convert
+ * @param bool $hash_prefix Whether or not to prefix the result with '#' (default: true)
+ * @return string
+ */
+function rgb2hex(array $rgb, $hash_prefix = true)
+{
+	if (!isset($rgb[0]) || !isset($rgb[1]) || !isset($rgb[2]) || $rgb[0] > 255 || $rgb[1] > 255 || $rgb[2] > 255)
+	{
+		return '#000000';
+	}
+	$hex = $hash_prefix ? '#' : '';
+	$hex .= str_pad(dechex(max(0, $rgb[0])), 2, '0', STR_PAD_LEFT);
+	$hex .= str_pad(dechex(max(0, $rgb[1])), 2, '0', STR_PAD_LEFT);
+	$hex .= str_pad(dechex(max(0, $rgb[2])), 2, '0', STR_PAD_LEFT);
+	return $hex;
+}
+
+/**
+ * This function includes another file in a clean scope.
+ * This is useful if the included file tries to define global variables.
+ * 
+ * @param string $filename The name of the file to include
+ * @return mixed
+ */
+function include_in_clean_scope($filename)
+{
+	return (include $filename);
+}
+
+/**
+ * This function includes another file while ignoring all errors inside of it.
+ * 
+ * @param string $filename The name of the file to include
+ * @return mixed
+ */
+function include_and_ignore_errors($filename)
+{
+	error_reporting(0);
+	$result = (include $filename);
+	error_reporting(~0);
+	return $result;
+}
+
+/**
+ * This function includes another file while ignoring all output.
+ * 
+ * @param string $filename The name of the file to include
+ * @return mixed
+ */
+function include_and_ignore_output($filename)
+{
+	ob_start();
+	$result = (include $filename);
+	ob_end_clean();
+	return $result;
+}
+
+/**
+ * Polyfill for hex2bin() which does not exist in PHP 5.3.
+ * 
+ * @param string $hex The hexadecimal string to convert to binary
+ * @return string
+ */
+if (!function_exists('hex2bin'))
+{
+	function hex2bin($hex)
+	{
+		if (strlen($hex) % 2) $hex = '0' . $hex;
+		return pack('H*', $hex);
+	}
+}
+
+/**
+ * Converts any value to either true or false.
+ * Based on util.php <https://github.com/brandonwamboldt/utilphp>
+ * 
+ * @param string $input The input value
+ * @return bool
+ */
+function tobool($input)
+{
+	if (preg_match('/^(1|[ty].*|on|oui|si|vrai|aye)$/i', $input)) return true;
+	if (preg_match('/^(0|[fn].*|off)$/i', $input)) return false;
+	return (bool)$input;
+}
+
+/**
+ * Checks if the given string contains valid UTF-8.
+ * 
+ * @param string $str The input string
+ * @return bool
+ */
+function utf8_check($str)
+{
+	if (function_exists('mb_check_encoding'))
+	{
+		return mb_check_encoding($str, 'UTF-8');
+	}
+	else
+	{
+		return ($str === @iconv('UTF-8', 'UTF-8', $str));
+	}
+}
+
 /**
  * Encode UTF-8 characters outside of the Basic Multilingual Plane in the &#xxxxxx format.
  * This allows emoticons and other characters to be stored in MySQL without utf8mb4 support.
@@ -21,3 +443,28 @@ function utf8_mbencode($str)
 		return '&#x' . dechex($codepoint) . ';';
 	}, $str);
 }
+
+/**
+ * This function replaces all whitespace characters with a single regular space (0x20).
+ * Unicode whitespace characters are also replaced.
+ * 
+ * @param string $str The input string
+ * @param bool $multiline Set this to true to permit newlines inside the string (default: false)
+ * @return string
+ */
+function utf8_normalize_spaces($str, $multiline = false)
+{
+	return $multiline ? preg_replace('/((?!\x0A)[\pZ\pC])+/u', ' ', $str) : preg_replace('/[\pZ\pC]+/u', ' ', $str);
+}
+
+/**
+ * This function trims all space from the beginning and end of a string.
+ * Unicode whitespace characters are also trimmed.
+ * 
+ * @param string $str The input string
+ * @return string
+ */
+function utf8_trim($str)
+{
+	return preg_replace('/^[\s\pZ\pC]+|[\s\pZ\pC]+$/u', '', $str);
+}
diff --git a/common/legacy.php b/common/legacy.php
index f59931a82..03332d9b7 100644
--- a/common/legacy.php
+++ b/common/legacy.php
@@ -1179,63 +1179,17 @@ function removeSrcHack($match)
 	return "<{$match[1]}{$tag}{$attr}{$match[4]}>";
 }
 
-// convert hexa value to RGB
+/**
+ * Convert hexa value to RGB
+ *
+ * @param string $hexstr
+ * @return array
+ */
 if(!function_exists('hexrgb'))
 {
-	/**
-	 * Convert hexa value to RGB
-	 *
-	 * @param string $hexstr
-	 * @return array
-	 */
 	function hexrgb($hex)
 	{
-		$hex = ltrim($hex, '#');
-		if(strlen($hex) == 3)
-		{
-			$r = hexdec(substr($hex, 0, 1) . substr($hex, 0, 1));
-			$g = hexdec(substr($hex, 1, 1) . substr($hex, 1, 1));
-			$b = hexdec(substr($hex, 2, 1) . substr($hex, 2, 1));
-		}
-		elseif(strlen($hex) == 6)
-		{
-			$r = hexdec(substr($hex, 0, 2));
-			$g = hexdec(substr($hex, 2, 2));
-			$b = hexdec(substr($hex, 4, 2));
-		}
-		else
-		{
-			$r = $g = $b = null;
-		}
-		return array('red' => $r, 'green' => $g, 'blue' => $b, 'r' => $r, 'g' => $g, 'b' => $b);
-	}
-}
-
-// convert RGB value to hexa
-if(!function_exists('rgbhex'))
-{
-	/**
-	 * convert RGB value to hexa
-	 *
-	 * @param array $rgb
-	 * @param bool $hash_prefix
-	 * @return string
-	 */
-	function rgbhex(array $rgb, $hash_prefix = true)
-	{
-		if(!isset($rgb['r']) && !isset($rgb['g']) && !isset($rgb['b']) && count($rgb) >= 3)
-		{
-			list($rgb['r'], $rgb['g'], $rgb['b']) = $rgb;
-		}
-		if(!isset($rgb['r']) || !isset($rgb['g']) || !isset($rgb['b']) || $rgb['r'] > 255 || $rgb['g'] > 255 || $rgb['b'] > 255)
-		{
-			return '#000000';
-		}
-		$hex = $hash_prefix ? '#' : '';
-		$hex .= str_pad(dechex(max(0, $rgb['r'])), 2, '0', STR_PAD_LEFT);
-		$hex .= str_pad(dechex(max(0, $rgb['g'])), 2, '0', STR_PAD_LEFT);
-		$hex .= str_pad(dechex(max(0, $rgb['b'])), 2, '0', STR_PAD_LEFT);
-		return $hex;
+		return hex2rgb($hex);
 	}
 }