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Link: http://codepad.org/o9I3zdI9    [ raw code | output | fork ]

PHP, pasted on Oct 20: 
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function str_count_sentences($string) {
	// initiate a counter and define the possible sentence-ending-symbols
	$i = 0;
	$end_characters = array('. ', '? ', '! ');
	
	// add a space to the end, for good mesuarement
	// also: convert /r, /n etc to /rSPACE and /nSPACE
	$string = $string . ' ';
	$string = str_replace(PHP_EOL, PHP_EOL.' ', $string);

	// for each end-character: count how many there are.
	foreach ($end_characters as $end_character) {
		// count them
		$i_by_end_character = substr_count($string, $end_character);
		
		// sum up the countings
		$counter_sentences += $i_by_end_character;
	}

	// return a INT of the amount of sentence-enders (=== sentences)
	return $counter_sentences;
}


Output: 
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function str_count_sentences($string) {
	// initiate a counter and define the possible sentence-ending-symbols
	$i = 0;
	$end_characters = array('. ', '? ', '! ');
	
	// add a space to the end, for good mesuarement
	// also: convert /r, /n etc to /rSPACE and /nSPACE
	$string = $string . ' ';
	$string = str_replace(PHP_EOL, PHP_EOL.' ', $string);

	// for each end-character: count how many there are.
	foreach ($end_characters as $end_character) {
		// count them
		$i_by_end_character = substr_count($string, $end_character);
		
		// sum up the countings
		$counter_sentences += $i_by_end_character;
	}

	// return a INT of the amount of sentence-enders (=== sentences)
	return $counter_sentences;
}


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