how to replace special characters with the ones they’re based on in PHP?

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If you don’t have access to the Normalizer class or just don’t wish to use it you can use the following function to replace most (all?) of the common accentuations.

function Unaccent($string)
{
    return preg_replace('~&([a-z]{1,2})(acute|cedil|circ|grave|lig|orn|ring|slash|th|tilde|uml);~i', '$1', htmlentities($string, ENT_QUOTES, 'UTF-8'));
}

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