PHP html_entity_decode() function convert HTML entities to their corresponding characters. html_entity_decode() is the opposite of htmlentities() in that it converts HTML entities in the string to their corresponding characters.
html_entity_decode ( string $string [, int $flags = ENT_COMPAT
| ENT_HTML401 [, string $encoding = ini_get("default_charset") ]]
) : string
More precisely, this function decodes all the entities (including all numeric entities) that a) are necessarily valid for the chosen document type — i.e., for XML, this function does not decode named entities that might be defined in some DTD — and b) whose character or characters are in the coded character set associated with the chosen encoding and are permitted in the chosen document type. All other entities are left as is.
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