html_entity_decode

(PHP 4 = 4.3.0)

html_entity_decode -- Convert all HTML entities to their applicable characters

Description

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

html_entity_decode() is the opposite of htmlentities() in that it converts all HTML entities to their applicable characters from string .

The optional second quote_style parameter lets you define what will be done with 'single' and "double" quotes. It takes on one of three constants with the default being ENT_COMPAT :

表 1Available quote_style constants

Constant Name Description
ENT_COMPAT Will convert double-quotes and leave single-quotes alone.
ENT_QUOTES Will convert both double and single quotes.
ENT_NOQUOTES Will leave both double and single quotes unconverted.


The ISO-8859-1 character set is used as default for the optional third charset . This defines the character set used in conversion.

例 1Decoding html entities

 ?php
$orig = "I'll \"walk\" the  b dog /b  now";

$a = htmlentities($orig);

$b = html_entity_decode($a);

echo $a; // I'll  quot;walk quot; the  lt;b gt;dog lt;/b gt; now

echo $b; // I'll "walk" the  b dog /b  now


// For users prior to PHP 4.3.0 you may do this:
function unhtmlentities ($string)
{
    $trans_tbl = get_html_translation_table (HTML_ENTITIES);
    $trans_tbl = array_flip ($trans_tbl);
    return strtr ($string, $trans_tbl);
}

$c = unhtmlentities($a);

echo $c; // I'll "walk" the  b dog /b  now

? 


注意 You might wonder why trim(html_entity_decode(' nbsp;')); doesn't reduce the string to an empty string, that's because the ' nbsp;' entity is not ASCII code 32 (which is stripped by trim() ) but ASCII code 160 (0xa0) in the default ISO 8859-1 characterset.



See also htmlentities() , htmlspecialchars() , get_html_translation_table() , htmlspecialchars() and urldecode() .