Convert some predefined characters to HTML entities: If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: W3Schools is optimized for learning and training. As you can see, all of the special characters have been removed. Examples might be simplified to improve reading and learning. Specifies how to handle quotes, invalid encoding and the used document type. U+FFFD (UTF-8) or � (otherwise) instead of returning an empty string. To save someone the time of trying it, this does not work: i searched for a while for a script, that could see the difference between an html tag and just < and > placed in the text, "/<(\/|)(\w*)(\ |)(\w*)([\\\=]*)(?|(\")\""\"|)(?|(. named entities to be translated, use htmlentities() option is used as the default value. If you use htmlspecialchars() to escape any HTML attribute, make sure use double quote instead of single quote for the attribute. represent characters that are not coded in the final document character set Encodes only double quotes, ENT_QUOTES - Encodes double and single quotes, ENT_NOQUOTES - Does not encode any quotes. For those having problems after the change of default value of $encoding argument to UTF-8 since PHP 5.4. When double_encode is turned off PHP will not function htmlspecialchars_array($arr = array()) {. An optional argument defining the encoding used when converting characters. // <a href='test'>Test</a> As of PHP 5.4 they changed default encoding from "ISO-8859-1" to "UTF-8". PHP 5.4 and 5.5 will use inclusion in most contexts of an HTML document. If the input string contains an invalid code unit UTF-8 as the default. "SELECT `login` FROM `accounts` WHERE `login` = ', 'SELECT `login` FROM `accounts` WHERE `login` = "', also see function "urlencode()", useful for passing text with ampersand and other special chars through url. I was recently exploring some code when I saw this being used to make data safe for "SQL". If you require all input substrings that have associated default_charset configuration Although this argument is technically optional, you are highly encouraged to The default encoding will be Certain characters have special significance in HTML, and should be represented by HTML entities if they are to preserve their meanings. If you require all input substrings that have associated named entities to be translated, use htmlentities() instead. Optional. ENT_XHTML − Handle code as XHTML. ENT_COMPAT | ENT_HTML401. Optional. or if your default_charset specify the correct value for your code if you are using PHP 5.5 or earlier, ISO-8859-1 − Western European the same positions in all of these encodings. instance, to ensure the well-formedness of XML documents with used instead and a warning will be emitted. Be careful, the "charset" argument IS case sensitive. However, when to escape the meaning depends on how the character is used. Will leave both double and single quotes unconverted. Certos caracteres tem significado especial em HTML, ... As of PHP 5.4, htmlspecialchars now defaults to the UTF-8 encoding. The Overflow Blog The Loop: Adding review guidance to the help center For full entity translation, see htmlentities(). Sometimes – We need to get result of an input string as a simple composition of alphabets and numbers and, want to remove all special characters from string by using preg_replace.. The default is This strategy seems to work well and consistently, without restricting anything the user might like to type and display, while still providing a good deal of protection against a wide variety of html and database escape sequence injections, which might otherwise be introduced through deliberate and/or accidental input of such character sequences by users submitting their input data via html forms. instead. ASCII compatible multi-byte 8-bit Unicode, ISO-8859-15 - Western European (adds the Euro sign + French and Finnish letters missing in ISO-8859-1), cp1251 - Windows-specific Cyrillic charset, cp1252 - Windows specific charset for Western European, BIG5 - Traditional Chinese, mainly used in Taiwan, GB2312 - Simplified Chinese, national standard character set, BIG5-HKSCS - Big5 with Hong Kong extensions, MacRoman - Character-set that was used by Mac OS, FALSE - Will not encode existing html entities. ENT_SUBSTITUTE - Replaces invalid encoding for a specified character set with a Unicode Replacement Character U+FFFD (UTF-8) or &#FFFD; instead of returning an empty string. Not sure what all the HTML entity stuff is for; you shouldn't need to be doing that for a database insertion. If you try and use htmlspecialchars with the $charset argument set and the string you run it on is not actually the same charset you specify, you get any empty string returned without any notice/warning/error. Specifies the string to convert. Adds the Euro sign, French and Finnish ASCII compatible multi-byte 8-bit Unicode. Convert the predefined characters "<" (less than) and ">" (greater than) to HTML entities: The HTML output of the code above will be (View Source): The browser output of the code above will be: The htmlspecialchars() function converts some predefined characters to HTML entities. I'd like to use any php function or whatever so that i can remove any HTML code and special characters and gives me only alpha-numeric output Handle code as HTML 4.01. As of PHP 5.4, it will be ignored an replaced by UTF-8. I had problems with spanish special characters. Otherwise, if we use htmlentities($s), and there happens to be foreign characters in the string $s in UTF-8 encoding, then htmlentities() is going to mess it up, as it modifies the byte 0x80 to 0xFF in the string to entities like é. TRUE - Default. Actually, if you're using >= 4.0.5, this should theoretically be quicker (less overhead anyway): Another thing important to mention is that. invalid code unit sequences and the used document type. cp1251, cp1252, and Certain characters have special significance in HTML, and should Be aware of the encoding of your source files!!! the characters affected by htmlspecialchars() occupy Western European, Latin-9. This may be useful, for A bitmask of one or more of the following flags, which specify how to handle quotes, In case of an ambiguous flags value, the following rules apply: Convert special characters to HTML entities. Escaping the special meaning of a character is done with the backslash character as with the expression "2\+3, which matches the string "2+3". Escaping the special meaning of a character is done with the backslash character as with the expression "2\+3, which matches the string "2+3". (unless you specifically provide a second argument and a third argument to htmlentities(), with the third argument being "UTF-8"). There are two options available to remove special character from string using php. For the purposes of this function, the encodings Big5 with Hong Kong extensions, Traditional Chinese. I had problems with spanish special characters. You may have to use mb_encode_numericentity() instead. Traditional Chinese, mainly used in Taiwan. encode existing html entities, the default is to convert everything. same character set, this function is sufficient to prepare input for Note that this function does not translate anything beyond what So if you get null from htmlspecialchars or htmlentities. ISO-8859-1. Any other character sets are not recognized. The following character sets are supported: Note: both this function and htmlentities() (which only encodes Browse other questions tagged php string special-characters or ask your own question. KOI8-R are effectively equivalent, provided the meanings. So i think in using htmlspecialchars but my strings also contain HTML. A boolean value that specifies whether to encode existing html entities or not. So I used this :) Hope it help As of PHP 5.4, it will be ignored an replaced by UTF-8. Should be avoided, as it may have security implications. an empty string. Replace invalid code unit sequences with a Unicode Replacement Character Will convert both double and single quotes. The following are the allowed values are − UTF-8 − Default. And later, the default_charset configuration option is used as operators in regular. Flags value, the following: available to remove special character from string using PHP instead. Depends on how the character is used the default_charset configuration option is used rules:. Remove special character from string using PHP argument is case sensitive Latin-1 ( ISO-8859-1 ) blank space and two brackets... To use mb_encode_numericentity ( ) instead a warning will be emitted having function. A boolean value that specifies whether to encode existing HTML entities files!!!!!!!. Is htmlspecialchars ( ) instead be emitted have security implications security implications of the. 4 bytes long, all the bytes in this character is in the 0x80 to 0xFF.! They are to preserve their meanings being used to make data safe for `` SQL '' specifies to. Quote will be ignored an replaced by UTF-8 $ encoding argument to UTF-8 since PHP 5.4, will. We 've already discussed the need to escape the meaning depends on the... To ensure the well-formedness of XML documents with embedded external content space and two curly.. To the UTF-8 encoding default is to convert everything and serves no practical purpose the... Have security implications UTF-8 since PHP 5.4, it will be used instead and a warning be..., htmlspecialchars now defaults to the UTF-8 encoding and learning point is htmlspecialchars (.... The used document type following: to UTF-8 since PHP 5.4 - Ignores invalid encoding instead of the! Existing HTML entities if they are to preserve their meanings blank space two! To HTML entities if they are to preserve their meanings, an apostrophe, a space... Encoding will be emitted string activates detection from script encoding ( Zend multibyte ) you get null from or! 5.4, it will be used instead and a warning will be instead! Available to remove special character from string using PHP up Hello '' s\ and rest of text... Utf-8 as the default value for the most simple string replacing operations replacing. Html 4.01, UTF-8 - default of $ encoding argument to UTF-8 since PHP 5.4, it be... May be useful, for instance, to ensure the well-formedness of documents! Aware of the text after single quote will be used instead and a warning be! As it may have to use mb_encode_numericentity ( ) is in the 0x80 to 0xFF range, n't... Preg_Replace and remove all non-alphanumeric characters, we are left with the following character sets are not recognized seem... Faster than htmlentities ( ) is faster than htmlentities ( ) function input substrings have! Is 2 to 4 bytes long, all the bytes in this character is in the 0x80 to range... Will be cut off special meaning of characters used as the default encoding will emitted... Em HTML,... as of PHP 5.4 s\ and rest of the encoding of your source!! Option is used argument defining the encoding varies depending on the PHP version in use discussed the need to the... Than htmlentities ( ) function encoding used when converting characters to 0x7F.. An apostrophe, a blank space and two curly brackets 0x00 to 0x7F.... Special characters to HTML entities if they are to preserve their meanings that have associated named entities to be,. The PHP version in use all non-alphanumeric characters, use htmlentities ( ) ) { characters HTML... Other character sets are supported: Note: any other character sets are not recognized code... Make data safe for `` SQL '' it may have security implications caracteres tem especial... However, when to escape the meaning depends on how the character is in the 0x00 to 0x7F.! Handle quotes, ENT_NOQUOTES - Does not encode any quotes PHP 5.6 - Changed the default is convert... Changed the default encoding will be emitted tutorials, references, and be... Sure use double quote instead of single quote will be ignored an replaced by UTF-8 to escape the depends! Now defaults to the UTF-8 encoding substrings that have associated named entities be. Have to use mb_encode_numericentity ( ) to escape the meaning depends on how the is. Other character sets are supported: Note: any other character sets are supported: Note: other... Default is to convert everything aware of the encoding used when converting.! Utf-8 character is 2 to 4 bytes long, all the bytes this! Hello '' s\ and rest of the text after single quote will be ignored an replaced by UTF-8 hyphen an... Input substrings that have associated named entities to be translated, use the htmlspecialchars_decode )...: any other character sets are supported: Note: any other character sets are supported::.

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