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# htmlentities

(PHP 3, PHP 4 )

htmlentities -- Convert all applicable characters to HTML entities

## Description

string htmlentities ( string string [, int quote_style [, string charset]])

This function is identical to htmlspecialchars() in all ways, except that all characters which have HTML character entity equivalents are translated into these entities. Like htmlspecialchars(), it takes an optional second argument which indicates what should be done with single and double quotes. `ENT_COMPAT` (the default) will only convert double-quotes and leave single-quotes alone. `ENT_QUOTES` will convert both double and single quotes, and `ENT_NOQUOTES` will leave both double and single quotes unconverted.

At present, the ISO-8859-1 character set is used as default. Support for the optional second argument was added in PHP 3.0.17 and PHP 4.0.3.

Like htmlspecialchars(), it takes an optional third argument which defines character set used in conversion. Support for this argument was added in PHP 4.1.0.

There is no reverse of this function. However, you can create one on your own. Here is an example of how to do this.

Example 1. Reverse of htmlentities()
    <?php
    function unhtmlentities ($string)
    {
    	$trans_tbl = get_html_translation_table (HTML_ENTITIES);
    	$trans_tbl = array_flip ($trans_tbl);
    	return strtr ($string, $trans_tbl);
    }
    ?>

See also get_html_translation_table(), htmlspecialchars() and nl2br().

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