How to convert HTML entities to corresponding characters in PHP

php Xiaobian Yuzai will introduce to you how to convert HTML entities into corresponding characters. In web development, sometimes we need to convert special characters into HTML entities so that they can be displayed correctly in the browser. PHP provides the html_entity_decode() function to implement this function. This function can convert HTML entities into corresponding characters, for example, convert "<" into "<”，将“&”转换为“&”。接下来让我们一起来了解具体的用法和示例吧！

Convert HTML entities into corresponding characters in PHP

HTML entity is a specially formatted character used to represent special symbols or characters, such as special symbols (&, <, >) or special characters (€, ¢, ©). In order to display these characters correctly on a web page, the HTML entities need to be converted to the corresponding Unicode characters.

Use html_entity_decode() function

In php, you can use the html_entity_decode() function to convert HTML entities to corresponding Unicode characters. This function receives an HTML entity string as a parameter and returns the converted string.

$html_entity = "&";
$unicode_character = html_entity_decode($html_entity);

echo $unicode_character; // &

Use htmlspecialchars_decode() function

htmlspecialchars_decode() function is similar to the html_entity_decode() function, but it can be used to decode entities that have been escaped using the htmlspecialchars() function.

$html_special_entity = htmlspecialchars("&");
$unicode_character = htmlspecialchars_decode($html_special_entity);

echo $unicode_character; // &

Use strtr() function

strtr() The function can be used to replace specific characters or entities in a string with specific values. To convert HTML entities to the corresponding Unicode characters, you can use the following character conversion table:

$html_entities = array("&" => "&", "<" => "<", ">" => ">");
$unicode_string = strtr($html_entity_string, $html_entities);

Use preg_replace() function

preg_replace() The function can be used to replace characters or entities in a string based on regular expressions. To convert HTML entities to corresponding Unicode characters, you can use the following regular expression:

$unicode_string = preg_replace("/&[a-z0-9] ;/", "", $html_entity_string);

Notice:

• When using these functions to decode HTML entities, you must ensure that the input string is in a valid HTML entity format.
• For some advanced HTML entities, such as Unicode entities (HHHH;), you may need to use special decoding functions or libraries.
• Converted Unicode characters should be encoded using the appropriate character set as needed for correct display on web pages.

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