html special characters php

specify the correct value for your code if you are using PHP 5.5 or earlier, U+FFFD (UTF-8) or � (otherwise) instead of returning an empty string. // title will show up correctly as Hello"s'world, Human Language and Character Encoding Support, http://www.example.com/example.php?test=test, http://php.net/manual/en/function.override-function.php, http://php.net/manual/ru/function.runkit-function-redefine.php, http://www.php.net/manual/en/function.rename-function.php. inclusion in most contexts of an HTML document. If, however, the input can 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. Certain characters have special significance in HTML, and should be represented by HTML entities if they are to preserve their meanings. None can be in the 0x00 to 0x7F range. The following are the allowed values are − UTF-8 − Default. cp1251, cp1252, and When double_encode is turned off PHP will not Not sure what all the HTML entity stuff is for; you shouldn't need to be doing that for a database insertion. The following character sets are supported: Note: Optional. Big5 with Hong Kong extensions, Traditional Chinese. 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". ENT_XML1 − Handle code as XML 1. In case of an ambiguous flags value, the following rules apply: Convert special characters to HTML entities. instead. used instead and a warning will be emitted. [The only reason I can think of why you might try to entity-decode incoming input for the database would be if you find you are getting character references like Š in your form submission input. So I used this :) Hope it help instance, to ensure the well-formedness of XML documents with In this PHP tutorial, I will discuss how to remove special character from string in PHP. // <a href='test'>Test</a> As of PHP 5.4 they changed default encoding from "ISO-8859-1" to "UTF-8". *)?"(\")|)([\ ]?)(\/|)>/i". Additional flags for specifying the used doctype: Note: Unrecognized character-sets will be ignored and replaced by ISO-8859-1 in versions prior to PHP 5.4. substrings that have named entity equivalents) may be insufficient. So i think in using htmlspecialchars but my strings also contain HTML. TRUE - Default. Replace invalid code points for the given document type with a An optional argument defining the encoding used when converting characters. same character set, this function is sufficient to prepare input for (unless you specifically provide a second argument and a third argument to htmlentities(), with the third argument being "UTF-8"). PHP 5.6 - Changed the default value for the, ENT_COMPAT - Default. For those having problems after the change of default value of $encoding argument to UTF-8 since PHP 5.4. Will leave both double and single quotes unconverted. I was recently exploring some code when I saw this being used to make data safe for "SQL". letters missing in Latin-1 (ISO-8859-1). configuration option may be set incorrectly for the given input. A boolean value that specifies whether to encode existing html entities or not. Using this flag is discouraged as it. represent characters that are not coded in the final document character set '$string, $flags, $encoding, $double_encode', 'return overriden_htmlspecialchars($string, $flags, $encoding, $double_encode);'. // title will end up Hello"s\ and rest of the text after single quote will be cut off. The answer is, it won't. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. Optional. Handle code as HTML 4.01, UTF-8 - Default. This may be useful, for In HTML, special characters are typically those that can't be easily typed into a keyboard or may cause display issues if typed or pasted into a web page. the characters affected by htmlspecialchars() occupy encode existing html entities, the default is to convert everything. If the + isn't escaped, the pattern matches one or … ENT_HTML5 − Handle code as HTML 5. PHP 5.4 and 5.5 will use htmlentities(). If you require all input substrings that have associated HTML Character Sets HTML ASCII HTML ANSI HTML Windows-1252 HTML ISO-8859-1 HTML Symbols HTML UTF-8 Exercises HTML Exercises CSS Exercises JavaScript Exercises SQL Exercises PHP Exercises Python Exercises jQuery Exercises Bootstrap Exercises Java … option is used as the default value. ISO-8859-1. htmlspecialchars — Convert special characters to HTML entities. ISO-8859-1 − Western European When dealing with special characters I always take care of the following: Database, table and field character sets are all set to utf8_general_* or utf8_unicode_* I make sure my editor saves PHP files with the right character set; I set default_charset in php.ini to UTF-8 or; I send a Content-Type: text/html; charset=UTF-8 header default_charset configuration I had problems with spanish special characters. Be careful, the "charset" argument IS case sensitive. Should be avoided, as it may have security implications. This may seem obvious, but it caused me some frustration. Specifies how to handle quotes, invalid encoding and the used document type. conversions made. The default encoding will be used instead and a warning will be emitted. 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. Will convert both double and single quotes. 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. However, when to escape the meaning depends on how the character is used. When a UTF-8 character is 2 to 4 bytes long, all the bytes in this character is in the 0x80 to 0xFF range. A more important point is, when we use  htmlspecialchars($s) in our code, it is automatically compatible with UTF-8 string.