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The function: get_context() is described as:

/**

* Generates a text with approx. the specified length which contains the specified words and their context

* @param	string	$text	The full text from which context shall be extracted

* @param	string	$words	An array of words which should be contained in the result, has to be a valid part of a PCRE pattern (escape with preg_quote!)

* @param	int		$length	The desired length of the resulting text, however the result might be shorter or longer than this value

* @return	string			Context of the specified words separated by "..."

*/

function get_context($text, $words, $length = 400)

The $words is described as an array, but marked as an string in the doc-block.

@param	string	$words	An array of words which should be contained in the result, has to be a valid part of a PCRE pattern (escape with preg_quote!)

Should be changed to:

@param	array $words	An array of words which should be contained in the result, has to be a valid part of a PCRE pattern (escape with preg_quote!)

Maybe change the function input, too, to:

function get_context(string $text, array $words, int $length = 400)