Convert all HTML entities - PHP

htmlspecialchars() - Convert special characters to HTML entities

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(PHP 4 >= 4.3.0, PHP 5)

html_entity_decode — Convert all HTML entities to their applicable characters

html_entity_decode() - Convert all HTML entities to their applicable characters
get_html_translation_table() - Returns the translation table used by htmlspecialchars and htmlentities

urldecode() - Decodes URL-encoded string