PHP htmlentities() Function converts some characters to HTML entities. Function htmlentities() is php in built function.
Syntax :
htmlentities(string,flags,character-set,double_encode);
Parameter,
PHP htmlentities() Function
| Parameter |
Description |
| string |
Required. It is input string. |
| flags |
Optional. It specifies how to handle quotes, invalid encoding and the used document type.The default is ENT_COMPAT | ENT_HTML401.
Flags for quotes are as below,
- ENT_COMPAT - Encodes only double quotes
- ENT_QUOTES - Encodes double and single quotes
- ENT_NOQUOTES - Does not encode any quotes
Flags for invalid encoding are as below,
- ENT_IGNORE - It ignores invalid encoding
- ENT_SUBSTITUTE - It replaces invalid code unit sequences with a Unicode Replacement Character U+FFFD (UTF-8) or &#FFFD;
- ENT_DISALLOWED - It replaces code points that are invalid in the specified doctype with a Unicode Replacement Character U+FFFD (UTF-8) or &#FFFD;
Flags for used doctype as below,
- ENT_HTML401 - Default. It handles code as HTML 4.01
- ENT_HTML5 - It handles code as HTML 5
- ENT_XML1 - It handles code as XML 1
- ENT_XHTML - It handles code as XHTML
|
| character-set |
Optional. It specifies which character-set to use for string.
Allowed character-set are as below.
- UTF-8
- ISO-8859-1
- ISO-8859-15
- GB2312
- cp1251
- cp1252
|
| double_encode |
Optional.A boolean value that specifies whether to encode existing html entities or not.
- TRUE - Default. It Will convert everything.
- FALSE - It Will not encode existing html entities.
|
Let's see below example to understand php htmlentities() Function in details.
HTML Output for below example in view source as below,
<br>Maths <b>equation</b> => '(a+b)*c' ='ac+bc'<br>
Using ENT_COMPAT flag :Maths <b>equation</b> => '(a+b)*c' ='ac+bc'<br>
Using ENT_QUOTES flag :Maths <b>equation</b> => '(a+b)*c' ='ac+bc'<br>
Using ENT_NOQUOTES flag :Maths <b>equation</b> => '(a+b)*c' ='ac+bc'
Using UTF-8 character-set : Maths <b>equation</b> => '(a+b)*c' ='ac+bc'
Example :
<br><b>The browser output of the above code as below.</b>
<?php
$str = "Maths <b>equation</b> => '(a+b)*c' ='ac+bc'";
echo "<br>".htmlentities($str); // It will convert characters to HTML entities.
echo "<br>Using ENT_COMPAT flag :".htmlentities($str, ENT_COMPAT); // It will only convert double quotes.
echo "<br>Using ENT_QUOTES flag :".htmlentities($str, ENT_QUOTES); // It will convert double and single quotes .
echo "<br>Using ENT_NOQUOTES flag :".htmlentities($str, ENT_NOQUOTES); // It will not convert any quotes.
echo "<br> Using UTF-8 character-set : ".htmlentities($str, ENT_QUOTES | ENT_IGNORE, "UTF-8");
?>
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