Fix strtolower and strtoupper

nguyenanhung · nguyenanhung · commit 6fb934b5d15e · 2024-09-21T23:56:39.000+07:00
diff --git a/system/core/CodeIgniter.php b/system/core/CodeIgniter.php
@@ -246,7 +246,7 @@
  * in it's constructor, but it's _not_ class-specific.
  *
  */
-	$charset = strtoupper(config_item('charset'));
+	$charset = strtoupper((string) config_item('charset'));
 	ini_set('default_charset', $charset);
 
 	if (extension_loaded('mbstring'))
diff --git a/system/core/Common.php b/system/core/Common.php
@@ -267,7 +267,7 @@ function &is_loaded($class = '')
 
 		if ($class !== '')
 		{
-			$_is_loaded[strtolower($class)] = $class;
+			$_is_loaded[strtolower((string) $class)] = $class;
 		}
 
 		return $_is_loaded;
@@ -404,15 +404,15 @@ function &get_mimes()
 	 */
 	function is_https()
 	{
-		if (! empty($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) !== 'off') {
+		if (! empty($_SERVER['HTTPS']) && strtolower((string) $_SERVER['HTTPS']) !== 'off') {
 			return TRUE;
 		}
 
-		if (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && strtolower($_SERVER['HTTP_X_FORWARDED_PROTO']) === 'https') {
+		if (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && strtolower((string) $_SERVER['HTTP_X_FORWARDED_PROTO']) === 'https') {
 			return TRUE;
 		}
 
-		if (! empty($_SERVER['HTTP_FRONT_END_HTTPS']) && strtolower($_SERVER['HTTP_FRONT_END_HTTPS']) !== 'off') {
+		if (! empty($_SERVER['HTTP_FRONT_END_HTTPS']) && strtolower((string) $_SERVER['HTTP_FRONT_END_HTTPS']) !== 'off') {
 			return TRUE;
 		}
 
diff --git a/system/core/Input.php b/system/core/Input.php
@@ -410,7 +410,7 @@ public function set_cookie($name, $value = '', $expire = '', $domain = '', $path
 		isset($samesite) OR $samesite = config_item('cookie_samesite');
 		if (isset($samesite))
 		{
-			$samesite = ucfirst(strtolower($samesite));
+			$samesite = ucfirst(strtolower((string) $samesite));
 			in_array($samesite, array('Lax', 'Strict', 'None'), TRUE) OR $samesite = 'Lax';
 		}
 		else
@@ -598,7 +598,7 @@ public function ip_address()
 	 */
 	public function valid_ip($ip, $which = '')
 	{
-		switch (strtolower($which))
+		switch (strtolower((string) $which))
 		{
 			case 'ipv4':
 				$which = FILTER_FLAG_IPV4;
@@ -817,7 +817,7 @@ public function request_headers($xss_clean = FALSE)
 				if (sscanf($key, 'HTTP_%s', $header) === 1)
 				{
 					// take SOME_HEADER and turn it into Some-Header
-					$header = str_replace('_', ' ', strtolower($header));
+					$header = str_replace('_', ' ', strtolower((string) $header));
 					$header = str_replace(' ', '-', ucwords($header));
 
 					$this->headers[$header] = $_SERVER[$key];
@@ -848,11 +848,11 @@ public function get_request_header($index, $xss_clean = FALSE)
 			empty($this->headers) && $this->request_headers();
 			foreach ($this->headers as $key => $value)
 			{
-				$headers[strtolower($key)] = $value;
+				$headers[strtolower((string) $key)] = $value;
 			}
 		}
 
-		$index = strtolower($index);
+		$index = strtolower((string) $index);
 
 		if ( ! isset($headers[$index]))
 		{
@@ -875,7 +875,7 @@ public function get_request_header($index, $xss_clean = FALSE)
 	 */
 	public function is_ajax_request()
 	{
-		return ( ! empty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) === 'xmlhttprequest');
+		return ( ! empty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower((string) $_SERVER['HTTP_X_REQUESTED_WITH']) === 'xmlhttprequest');
 	}
 
 	// --------------------------------------------------------------------
diff --git a/system/core/Loader.php b/system/core/Loader.php
@@ -976,7 +976,7 @@ protected function _ci_load_library($class, $params = null, $object_name = null)
         if (class_exists($class, false)) {
             $property = $object_name;
             if (empty($property)) {
-                $property = strtolower($class);
+                $property = strtolower((string) $class);
                 isset($this->_ci_varmap[$property]) && $property = $this->_ci_varmap[$property];
             }
 
@@ -1041,7 +1041,7 @@ protected function _ci_load_stock_library($library_name, $file_path, $params, $o
 
             $property = $object_name;
             if (empty($property)) {
-                $property = strtolower($library_name);
+                $property = strtolower((string) $library_name);
                 isset($this->_ci_varmap[$property]) && $property = $this->_ci_varmap[$property];
             }
 
@@ -1120,21 +1120,21 @@ protected function _ci_init_library($class, $prefix, $config = false, $object_na
                     // We test for both uppercase and lowercase, for servers that
                     // are case-sensitive with regard to file names. Load global first,
                     // override with environment next
-                    if (file_exists($path . 'config/' . strtolower($class) . '.php')) {
+                    if (file_exists($path . 'config/' . strtolower((string) $class) . '.php')) {
                         include($path . 'config/' . strtolower($class) . '.php');
                         $found = true;
-                    } elseif (file_exists($path . 'config/' . ucfirst(strtolower($class)) . '.php')) {
-                        include($path . 'config/' . ucfirst(strtolower($class)) . '.php');
+                    } elseif (file_exists($path . 'config/' . ucfirst(strtolower((string) $class)) . '.php')) {
+                        include($path . 'config/' . ucfirst(strtolower((string) $class)) . '.php');
                         $found = true;
                     }
 
-                    if (file_exists($path . 'config/' . ENVIRONMENT . '/' . strtolower($class) . '.php')) {
-                        include($path . 'config/' . ENVIRONMENT . '/' . strtolower($class) . '.php');
+                    if (file_exists($path . 'config/' . ENVIRONMENT . '/' . strtolower((string) $class) . '.php')) {
+                        include($path . 'config/' . ENVIRONMENT . '/' . strtolower((string) $class) . '.php');
                         $found = true;
                     } elseif (file_exists(
-                        $path . 'config/' . ENVIRONMENT . '/' . ucfirst(strtolower($class)) . '.php'
+                        $path . 'config/' . ENVIRONMENT . '/' . ucfirst(strtolower((string) $class)) . '.php'
                     )) {
-                        include($path . 'config/' . ENVIRONMENT . '/' . ucfirst(strtolower($class)) . '.php');
+                        include($path . 'config/' . ENVIRONMENT . '/' . ucfirst(strtolower((string) $class)) . '.php');
                         $found = true;
                     }
 
@@ -1158,7 +1158,7 @@ protected function _ci_init_library($class, $prefix, $config = false, $object_na
         // Set the variable name we will assign the class to
         // Was a custom class name supplied? If so we'll use it
         if (empty($object_name)) {
-            $object_name = strtolower($class);
+            $object_name = strtolower((string) $class);
             if (isset($this->_ci_varmap[$object_name])) {
                 $object_name = $this->_ci_varmap[$object_name];
             }
diff --git a/system/core/Log.php b/system/core/Log.php
@@ -175,7 +175,7 @@ public function write_log($level, $msg)
 			return FALSE;
 		}
 
-		$level = strtoupper($level);
+		$level = strtoupper((string) $level);
 
 		if (( ! isset($this->_levels[$level]) OR ($this->_levels[$level] > $this->_threshold))
 			&& ! isset($this->_threshold_array[$this->_levels[$level]]))
diff --git a/system/core/Router.php b/system/core/Router.php
@@ -382,7 +382,7 @@ protected function _parse_routes()
 		$uri = implode('/', $this->uri->segments);
 
 		// Get HTTP verb
-		$http_verb = isset($_SERVER['REQUEST_METHOD']) ? strtolower($_SERVER['REQUEST_METHOD']) : 'cli';
+		$http_verb = isset($_SERVER['REQUEST_METHOD']) ? strtolower((string) $_SERVER['REQUEST_METHOD']) : 'cli';
 
 		// Loop through the route array looking for wildcards
 		foreach ($this->routes as $key => $val)
diff --git a/system/core/Security.php b/system/core/Security.php
@@ -1013,7 +1013,7 @@ protected function _sanitize_naughty_html($matches)
 		if (empty($matches['closeTag'])) {
 			return '&lt;' . $matches[1];
 		} // Is the element that we caught naughty? If so, escape it
-		elseif (in_array(strtolower($matches['tagName']), $naughty_tags, true)) {
+		elseif (in_array(strtolower((string) $matches['tagName']), $naughty_tags, true)) {
 			return '&lt;' . $matches[1] . '&gt;';
 		} // For other tags, see if their attributes are "evil" and strip those
 		elseif (isset($matches['attributes'])) {
diff --git a/system/core/Utf8.php b/system/core/Utf8.php
@@ -63,7 +63,7 @@ public function __construct()
 		if (
 			defined('PREG_BAD_UTF8_ERROR')				// PCRE must support UTF-8
 			&& (ICONV_ENABLED === TRUE OR MB_ENABLED === TRUE)	// iconv or mbstring must be installed
-			&& strtoupper(config_item('charset')) === 'UTF-8'	// Application charset must be UTF-8
+			&& strtoupper((string) config_item('charset')) === 'UTF-8'	// Application charset must be UTF-8
 			)
 		{
 			define('UTF8_ENABLED', TRUE);
diff --git a/system/core/compat/hash.php b/system/core/compat/hash.php
@@ -120,7 +120,7 @@ function hash_equals($known_string, $user_string)
 	 */
 	function hash_pbkdf2($algo, $password, $salt, $iterations, $length = 0, $raw_output = FALSE)
 	{
-		if ( ! in_array(strtolower($algo), hash_algos(), TRUE))
+		if ( ! in_array(strtolower((string) $algo), hash_algos(), TRUE))
 		{
 			trigger_error('hash_pbkdf2(): Unknown hashing algorithm: '.$algo, E_USER_WARNING);
 			return FALSE;
diff --git a/system/database/DB_forge.php b/system/database/DB_forge.php
@@ -777,7 +777,7 @@ protected function _process_fields($create_table = FALSE)
 
 			if (isset($attributes['TYPE']) && ! empty($attributes['CONSTRAINT']))
 			{
-				switch (strtoupper($attributes['TYPE']))
+				switch (strtoupper((string) $attributes['TYPE']))
 				{
 					case 'ENUM':
 					case 'SET':
diff --git a/system/database/DB_query_builder.php b/system/database/DB_query_builder.php
@@ -406,7 +406,7 @@ protected function _max_min_avg_sum($select = '', $alias = '', $type = 'MAX')
 			$this->display_error('db_invalid_query');
 		}
 
-		$type = strtoupper($type);
+		$type = strtoupper((string) $type);
 
 		if ( ! in_array($type, array('MAX', 'MIN', 'AVG', 'SUM')))
 		{
@@ -535,7 +535,7 @@ public function join($table, $cond, $type = '', $escape = NULL)
 	{
 		if ($type !== '')
 		{
-			$type = strtoupper(trim($type));
+			$type = strtoupper(trim((string) $type));
 
 			if ( ! in_array($type, array('LEFT', 'RIGHT', 'OUTER', 'INNER', 'LEFT OUTER', 'RIGHT OUTER', 'FULL OUTER', 'FULL'), TRUE))
 			{
diff --git a/system/database/drivers/cubrid/cubrid_forge.php b/system/database/drivers/cubrid/cubrid_forge.php
@@ -169,7 +169,7 @@ protected function _process_column($field)
 	 */
 	protected function _attr_type(&$attributes)
 	{
-		switch (strtoupper($attributes['TYPE']))
+		switch (strtoupper((string) $attributes['TYPE']))
 		{
 			case 'TINYINT':
 				$attributes['TYPE'] = 'SMALLINT';
diff --git a/system/database/drivers/ibase/ibase_forge.php b/system/database/drivers/ibase/ibase_forge.php
@@ -215,7 +215,7 @@ protected function _process_column($field)
 	 */
 	protected function _attr_type(&$attributes)
 	{
-		switch (strtoupper($attributes['TYPE']))
+		switch (strtoupper((string) $attributes['TYPE']))
 		{
 			case 'TINYINT':
 				$attributes['TYPE'] = 'SMALLINT';
diff --git a/system/database/drivers/mssql/mssql_driver.php b/system/database/drivers/mssql/mssql_driver.php
@@ -311,7 +311,7 @@ protected function _list_columns($table = '')
 	{
 		return 'SELECT COLUMN_NAME
 			FROM INFORMATION_SCHEMA.Columns
-			WHERE UPPER(TABLE_NAME) = '.$this->escape(strtoupper($table));
+			WHERE UPPER(TABLE_NAME) = '.$this->escape(strtoupper((string) $table));
 	}
 
 	// --------------------------------------------------------------------
@@ -326,7 +326,7 @@ public function field_data($table)
 	{
 		$sql = 'SELECT COLUMN_NAME, DATA_TYPE, CHARACTER_MAXIMUM_LENGTH, NUMERIC_PRECISION, COLUMN_DEFAULT
 			FROM INFORMATION_SCHEMA.Columns
-			WHERE UPPER(TABLE_NAME) = '.$this->escape(strtoupper($table));
+			WHERE UPPER(TABLE_NAME) = '.$this->escape(strtoupper((string) $table));
 
 		if (($query = $this->query($sql)) === FALSE)
 		{
diff --git a/system/database/drivers/mssql/mssql_forge.php b/system/database/drivers/mssql/mssql_forge.php
@@ -119,7 +119,7 @@ protected function _attr_type(&$attributes)
 			unset($attributes['CONSTRAINT']);
 		}
 
-		switch (strtoupper($attributes['TYPE']))
+		switch (strtoupper((string) $attributes['TYPE']))
 		{
 			case 'MEDIUMINT':
 				$attributes['TYPE'] = 'INTEGER';
diff --git a/system/helpers/form_helper.php b/system/helpers/form_helper.php
@@ -86,7 +86,7 @@ function form_open($action = '', $attributes = array(), $hidden = array())
 
 		if (stripos($attributes, 'accept-charset=') === FALSE)
 		{
-			$attributes .= ' accept-charset="'.strtolower(config_item('charset')).'"';
+			$attributes .= ' accept-charset="'.strtolower((string) config_item('charset')).'"';
 		}
 
 		$form = '<form action="'.$action.'"'.$attributes.">\n";
diff --git a/system/helpers/inflector_helper.php b/system/helpers/inflector_helper.php
@@ -221,7 +221,7 @@ function underscore($str)
 	 */
 	function humanize($str, $separator = '_')
 	{
-		return ucwords(preg_replace('/['.preg_quote($separator).']+/', ' ', trim(MB_ENABLED ? mb_strtolower($str) : strtolower($str))));
+		return ucwords(preg_replace('/['.preg_quote($separator).']+/', ' ', trim(MB_ENABLED ? mb_strtolower((string) $str) : strtolower((string) $str))));
 	}
 }
 
diff --git a/system/libraries/Encryption.php b/system/libraries/Encryption.php
@@ -229,12 +229,12 @@ protected function _mcrypt_initialize($params)
 	{
 		if ( ! empty($params['cipher']))
 		{
-			$params['cipher'] = strtolower($params['cipher']);
+			$params['cipher'] = strtolower((string) $params['cipher']);
 			$this->_cipher_alias($params['cipher']);
 
 			if ( ! in_array($params['cipher'], mcrypt_list_algorithms(), TRUE))
 			{
-				log_message('error', 'Encryption: MCrypt cipher '.strtoupper($params['cipher']).' is not available.');
+				log_message('error', 'Encryption: MCrypt cipher '.strtoupper((string) $params['cipher']).' is not available.');
 			}
 			else
 			{
@@ -244,10 +244,10 @@ protected function _mcrypt_initialize($params)
 
 		if ( ! empty($params['mode']))
 		{
-			$params['mode'] = strtolower($params['mode']);
+			$params['mode'] = strtolower((string) $params['mode']);
 			if ( ! isset($this->_modes['mcrypt'][$params['mode']]))
 			{
-				log_message('error', 'Encryption: MCrypt mode '.strtoupper($params['mode']).' is not available.');
+				log_message('error', 'Encryption: MCrypt mode '.strtoupper((string) $params['mode']).' is not available.');
 			}
 			else
 			{
@@ -267,11 +267,11 @@ protected function _mcrypt_initialize($params)
 
 			if ($this->_handle = mcrypt_module_open($this->_cipher, '', $this->_mode, ''))
 			{
-				log_message('info', 'Encryption: MCrypt cipher '.strtoupper($this->_cipher).' initialized in '.strtoupper($this->_mode).' mode.');
+				log_message('info', 'Encryption: MCrypt cipher '.strtoupper((string) $this->_cipher).' initialized in '.strtoupper((string) $this->_mode).' mode.');
 			}
 			else
 			{
-				log_message('error', 'Encryption: Unable to initialize MCrypt with cipher '.strtoupper($this->_cipher).' in '.strtoupper($this->_mode).' mode.');
+				log_message('error', 'Encryption: Unable to initialize MCrypt with cipher '.strtoupper((string) $this->_cipher).' in '.strtoupper((string) $this->_mode).' mode.');
 			}
 		}
 	}
@@ -298,7 +298,7 @@ protected function _openssl_initialize($params)
 			$params['mode'] = strtolower($params['mode']);
 			if ( ! isset($this->_modes['openssl'][$params['mode']]))
 			{
-				log_message('error', 'Encryption: OpenSSL mode '.strtoupper($params['mode']).' is not available.');
+				log_message('error', 'Encryption: OpenSSL mode '.strtoupper((string) $params['mode']).' is not available.');
 			}
 			else
 			{
@@ -316,12 +316,12 @@ protected function _openssl_initialize($params)
 			if ( ! in_array($handle, openssl_get_cipher_methods(), TRUE))
 			{
 				$this->_handle = NULL;
-				log_message('error', 'Encryption: Unable to initialize OpenSSL with method '.strtoupper($handle).'.');
+				log_message('error', 'Encryption: Unable to initialize OpenSSL with method '.strtoupper((string) $handle).'.');
 			}
 			else
 			{
 				$this->_handle = $handle;
-				log_message('info', 'Encryption: OpenSSL initialized with method '.strtoupper($handle).'.');
+				log_message('info', 'Encryption: OpenSSL initialized with method '.strtoupper((string) $handle).'.');
 			}
 		}
 	}
diff --git a/system/libraries/Form_validation.php b/system/libraries/Form_validation.php
@@ -1201,7 +1201,7 @@ public function valid_url($str)
 			{
 				return FALSE;
 			}
-			elseif ( ! in_array(strtolower($matches[1]), array('http', 'https'), TRUE))
+			elseif ( ! in_array(strtolower((string) $matches[1]), array('http', 'https'), TRUE))
 			{
 				return FALSE;
 			}
diff --git a/system/libraries/Image_lib.php b/system/libraries/Image_lib.php
@@ -1181,8 +1181,8 @@ public function overlay_watermark()
 		// invert the offset. Same with the horizontal
 		// offset when the image is at the right
 
-		$this->wm_vrt_alignment = strtoupper($this->wm_vrt_alignment[0]);
-		$this->wm_hor_alignment = strtoupper($this->wm_hor_alignment[0]);
+		$this->wm_vrt_alignment = strtoupper((string) $this->wm_vrt_alignment[0]);
+		$this->wm_hor_alignment = strtoupper((string) $this->wm_hor_alignment[0]);
 
 		if ($this->wm_vrt_alignment === 'B')
 			$this->wm_vrt_offset = $this->wm_vrt_offset * -1;
@@ -1340,8 +1340,8 @@ public function text_watermark()
 			$this->wm_shadow_distance = 0;
 		}
 
-		$this->wm_vrt_alignment = strtoupper($this->wm_vrt_alignment[0]);
-		$this->wm_hor_alignment = strtoupper($this->wm_hor_alignment[0]);
+		$this->wm_vrt_alignment = strtoupper((string) $this->wm_vrt_alignment[0]);
+		$this->wm_hor_alignment = strtoupper((string) $this->wm_hor_alignment[0]);
 
 		// Set vertical alignment
 		if ($this->wm_vrt_alignment === 'M')
diff --git a/system/libraries/Javascript.php b/system/libraries/Javascript.php
@@ -697,7 +697,7 @@ public function inline($script, $cdata = TRUE)
 	 */
 	protected function _open_script($src = '')
 	{
-		return '<script type="text/javascript" charset="'.strtolower($this->CI->config->item('charset')).'"'
+		return '<script type="text/javascript" charset="'.strtolower((string) $this->CI->config->item('charset')).'"'
 			.($src === '' ? '>' : ' src="'.$src.'">');
 	}
 
diff --git a/system/libraries/Trackback.php b/system/libraries/Trackback.php
@@ -199,7 +199,7 @@ public function receive()
 				return FALSE;
 			}
 
-			$this->data['charset'] = isset($_POST['charset']) ? strtoupper(trim($_POST['charset'])) : 'auto';
+			$this->data['charset'] = isset($_POST['charset']) ? strtoupper(trim((string) $_POST['charset'])) : 'auto';
 
 			if ($val !== 'url' && MB_ENABLED === TRUE)
 			{
diff --git a/system/libraries/User_agent.php b/system/libraries/User_agent.php

Original file line number	Diff line number	Diff line change
`@@ -246,7 +246,7 @@`
`246`	`246`	`* in it's constructor, but it's _not_ class-specific.`
`247`	`247`	`*`
`248`	`248`	`*/`
`249`		`- $charset = strtoupper(config_item('charset'));`
	`249`	`+ $charset = strtoupper((string) config_item('charset'));`
`250`	`250`	`ini_set('default_charset', $charset);`
`251`	`251`
`252`	`252`	`if (extension_loaded('mbstring'))`
Original file line number	Diff line number	Diff line change
`@@ -267,7 +267,7 @@ function &is_loaded($class = '')`
`267`	`267`
`268`	`268`	`if ($class !== '')`
`269`	`269`	`{`
`270`		`- $_is_loaded[strtolower($class)] = $class;`
	`270`	`+ $_is_loaded[strtolower((string) $class)] = $class;`
`271`	`271`	`}`
`272`	`272`
`273`	`273`	`return $_is_loaded;`
`@@ -404,15 +404,15 @@ function &get_mimes()`
`404`	`404`	`*/`
`405`	`405`	`function is_https()`
`406`	`406`	`{`
`407`		`- if (! empty($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) !== 'off') {`
	`407`	`+ if (! empty($_SERVER['HTTPS']) && strtolower((string) $_SERVER['HTTPS']) !== 'off') {`
`408`	`408`	`return TRUE;`
`409`	`409`	`}`
`410`	`410`
`411`		`- if (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && strtolower($_SERVER['HTTP_X_FORWARDED_PROTO']) === 'https') {`
	`411`	`+ if (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && strtolower((string) $_SERVER['HTTP_X_FORWARDED_PROTO']) === 'https') {`
`412`	`412`	`return TRUE;`
`413`	`413`	`}`
`414`	`414`
`415`		`- if (! empty($_SERVER['HTTP_FRONT_END_HTTPS']) && strtolower($_SERVER['HTTP_FRONT_END_HTTPS']) !== 'off') {`
	`415`	`+ if (! empty($_SERVER['HTTP_FRONT_END_HTTPS']) && strtolower((string) $_SERVER['HTTP_FRONT_END_HTTPS']) !== 'off') {`
`416`	`416`	`return TRUE;`
`417`	`417`	`}`
`418`	`418`
Original file line number	Diff line number	Diff line change
`@@ -410,7 +410,7 @@ public function set_cookie($name, $value = '', $expire = '', $domain = '', $path`
`410`	`410`	`isset($samesite) OR $samesite = config_item('cookie_samesite');`
`411`	`411`	`if (isset($samesite))`
`412`	`412`	`{`
`413`		`- $samesite = ucfirst(strtolower($samesite));`
	`413`	`+ $samesite = ucfirst(strtolower((string) $samesite));`
`414`	`414`	`in_array($samesite, array('Lax', 'Strict', 'None'), TRUE) OR $samesite = 'Lax';`
`415`	`415`	`}`
`416`	`416`	`else`
`@@ -598,7 +598,7 @@ public function ip_address()`
`598`	`598`	`*/`
`599`	`599`	`public function valid_ip($ip, $which = '')`
`600`	`600`	`{`
`601`		`- switch (strtolower($which))`
	`601`	`+ switch (strtolower((string) $which))`
`602`	`602`	`{`
`603`	`603`	`case 'ipv4':`
`604`	`604`	`$which = FILTER_FLAG_IPV4;`
`@@ -817,7 +817,7 @@ public function request_headers($xss_clean = FALSE)`
`817`	`817`	`if (sscanf($key, 'HTTP_%s', $header) === 1)`
`818`	`818`	`{`
`819`	`819`	`// take SOME_HEADER and turn it into Some-Header`
`820`		`- $header = str_replace('_', ' ', strtolower($header));`
	`820`	`+ $header = str_replace('_', ' ', strtolower((string) $header));`
`821`	`821`	`$header = str_replace(' ', '-', ucwords($header));`
`822`	`822`
`823`	`823`	`$this->headers[$header] = $_SERVER[$key];`
`@@ -848,11 +848,11 @@ public function get_request_header($index, $xss_clean = FALSE)`
`848`	`848`	`empty($this->headers) && $this->request_headers();`
`849`	`849`	`foreach ($this->headers as $key => $value)`
`850`	`850`	`{`
`851`		`- $headers[strtolower($key)] = $value;`
	`851`	`+ $headers[strtolower((string) $key)] = $value;`
`852`	`852`	`}`
`853`	`853`	`}`
`854`	`854`
`855`		`- $index = strtolower($index);`
	`855`	`+ $index = strtolower((string) $index);`
`856`	`856`
`857`	`857`	`if ( ! isset($headers[$index]))`
`858`	`858`	`{`
`@@ -875,7 +875,7 @@ public function get_request_header($index, $xss_clean = FALSE)`
`875`	`875`	`*/`
`876`	`876`	`public function is_ajax_request()`
`877`	`877`	`{`
`878`		`- return ( ! empty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) === 'xmlhttprequest');`
	`878`	`+ return ( ! empty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower((string) $_SERVER['HTTP_X_REQUESTED_WITH']) === 'xmlhttprequest');`
`879`	`879`	`}`
`880`	`880`
`881`	`881`	`// --------------------------------------------------------------------`
Original file line number	Diff line number	Diff line change
`@@ -175,7 +175,7 @@ public function write_log($level, $msg)`
`175`	`175`	`return FALSE;`
`176`	`176`	`}`
`177`	`177`
`178`		`- $level = strtoupper($level);`
	`178`	`+ $level = strtoupper((string) $level);`
`179`	`179`
`180`	`180`	`if (( ! isset($this->_levels[$level]) OR ($this->_levels[$level] > $this->_threshold))`
`181`	`181`	`&& ! isset($this->_threshold_array[$this->_levels[$level]]))`
Original file line number	Diff line number	Diff line change
`@@ -63,7 +63,7 @@ public function __construct()`
`63`	`63`	`if (`
`64`	`64`	`defined('PREG_BAD_UTF8_ERROR') // PCRE must support UTF-8`
`65`	`65`	`&& (ICONV_ENABLED === TRUE OR MB_ENABLED === TRUE) // iconv or mbstring must be installed`
`66`		`- && strtoupper(config_item('charset')) === 'UTF-8' // Application charset must be UTF-8`
	`66`	`+ && strtoupper((string) config_item('charset')) === 'UTF-8' // Application charset must be UTF-8`
`67`	`67`	`)`
`68`	`68`	`{`
`69`	`69`	`define('UTF8_ENABLED', TRUE);`
Original file line number	Diff line number	Diff line change
`@@ -120,7 +120,7 @@ function hash_equals($known_string, $user_string)`
`120`	`120`	`*/`
`121`	`121`	`function hash_pbkdf2($algo, $password, $salt, $iterations, $length = 0, $raw_output = FALSE)`
`122`	`122`	`{`
`123`		`- if ( ! in_array(strtolower($algo), hash_algos(), TRUE))`
	`123`	`+ if ( ! in_array(strtolower((string) $algo), hash_algos(), TRUE))`
`124`	`124`	`{`
`125`	`125`	`trigger_error('hash_pbkdf2(): Unknown hashing algorithm: '.$algo, E_USER_WARNING);`
`126`	`126`	`return FALSE;`
Original file line number	Diff line number	Diff line change
`@@ -777,7 +777,7 @@ protected function _process_fields($create_table = FALSE)`
`777`	`777`
`778`	`778`	`if (isset($attributes['TYPE']) && ! empty($attributes['CONSTRAINT']))`
`779`	`779`	`{`
`780`		`- switch (strtoupper($attributes['TYPE']))`
	`780`	`+ switch (strtoupper((string) $attributes['TYPE']))`
`781`	`781`	`{`
`782`	`782`	`case 'ENUM':`
`783`	`783`	`case 'SET':`