<?php
class TextUtil {
	public function makePars($sentences,$num) 
		$pars=array();
		for($i=0;$i<$num;$i++){
			$p = rand($this->minPar,$this->maxPar);
			$k = count($sentences)-1;
			$p = ($p < $k)?$p:$k;
			shuffle($sentences);
			$rkeys = array_rand($sentences, $p );
			$par='';
			foreach($rkeys as $rk) {
				$par .= $sentences[$rk];
			}
			$pars[]=$par;
		}
		return $pars;
	}

	public function sentences($str,$min=null,$max=null) {
		$str = preg_replace("@\s+@"," ",$d);
		$sens = $this->splitSentences($d);
		return $sens;
	}

	public function filterLength($arr,$min=null,$max=null) {
		foreach($arr as $i => $a) {
			$k = strlen($a);
			if(!is_null($min))
				if($k < $min)
					unset($a[$i]);
			if(!is_null($max))
				if($k > $max)
					unset($a[$i]);
		}
		return $arr;
	}
	
	public function splitWords($str) {
		$words= array();
		preg_match_all("@(\w)@",$str,$m);
		$words = $m[1];
		return $words;
	}
	
	public function splitPars($str) {
		$str = preg_replace("@\s+@"," ",$d);
		$paragraphs= array();
		$paragraphs = preg_split('@\r\n\r\n|\n\n|<\s*br\s*\?\s*>\s*<\s*br\s*\?\s*>|<\s*/\s*p\s*>.*?<\s*p\s*>@i',$str);
		
		return $paragraphs;
	}
	
	public function splitSentences($str) {	
		// abbreviations to skip
		$skips = array ( 
		  'Jr', 'Mr', 'Mrs', 'Ms', 'Dr', 'Prof', 'Sr' ,
		  'jr', 'mr', 'mrs', 'ms', 'dr', 'prof', 'sr' ,
		  'col','gen', 'lt', 'cmdr',
		  'dept', 'univ',
		  'inc', 'ltd',
		  'arc', 'al', 'ave', 'cl', 'ct', 'cres', 'dr',
		  'la', 'pl', 'plz', 'rd', 'tce',
		  'Ala' , 'Ariz', 'Ark', 'Cal', 'Calif', 'Col', 'Colo', 'Conn',
		  'Del', 'Fed' , 'Fla', 'Ga', 'Ida', 'Id', 'Ill', 'Ind', 'Ia',
		  'Kan', 'Kans', 'Ken', 'Ky' , 'La', 'Me', 'Md', 'Is', 'Mass', 
		  'Mich', 'Minn', 'Miss', 'Mo', 'Mont', 'Neb', 'Nebr' , 'Nev',
		  'Mex', 'Okla', 'Ok', 'Ore', 'Oreg', 'Penna', 'Penn', 'Pa'  , 'Dak',
		  'Tenn', 'Tex', 'Ut', 'Vt', 'Va', 'Wash', 'Wis', 'Wisc', 'Wy',
		  'Wyo', 'USAFA', 'Alta' , 'Man', 'Ont', 'Que', 'Sask', 'Yuk'.
		  'jan','feb','mar','apr','may','jun','jul','aug','sep','oct','nov','dec', 'sept',
		  'vs', 'etc', 'no',
		  );

		// build regex string
		$skip = '';
		foreach($skips as $abbr) {
			$skip .= '|\s{1}'.$abbr.'[.!?]';
		}
		$skip = '/(?i<!'.substr($skip,1).')(?<=[.?!])\s+(?=[^a-z])/';
		// split text into sentences
		$sentences = preg_split($skip,$str,-1,PREG_SPLIT_NO_EMPTY);
		return $sentences;
	}
}

?>