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<table style="width:50px;">
	<tr>
		<td style="word-break:break-all;word-wrap:break-word">
			Schrecklichlangeswortdasmannichtrennenkannoderwasmeintihr?
		</td>
	</tr>
</table>

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  function text_restrict_wordsize($str, $size, $fontsize = 7, $fontfile = 'verdana.ttf') {
	$size = max($size, 10);
	$fontpath = $_SERVER['DOCUMENT_ROOT'] . '/source/fonts/' . $fontfile;
	
	$strings = explode(' ', $str);

	foreach ($strings as $key => $string ) {
  		$dimensions = imagettfbbox($fontsize, 0, $fontpath, $string);
	  	$width = $dimensions[4]-$dimensions[6];
	  	
	  	if ($width > $size) { 			  	
		  	while ($width > $size) {
		  		$string = substr($string, 0, strlen($string)-1);
	  			$dimensions = imagettfbbox($fontsize, 0, $fontpath, $string . '-');
		  		$width = $dimensions[4]-$dimensions[6];
		  	}
			
		  	$strings[$key] = $string . '- ' . text_restrict_wordsize(substr($strings[$key], strlen($string), strlen($strings[$key]) - strlen($string) - 1), $size, $fontsize, $fontfile);
	  	}
	}
		
	return implode(' ', $strings);	  	
  }