Description:
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'pictures' should be 8 string length. Thought, I got the result. It said that 'pictures' is 13 string length. It isn't correct. I notice that I use different words. It shows that string length is added with 5 practically. You can see that 8 (pcitures) length + 5 add length = 13 string length. I don't know why it is.

Reproduce code:
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function word_match($a=null,$b=null)
			{
					print("Orginal A: $a<br>");
					$a_length = strlen($a);
					$b_length = strlen($b);
					$search = true;
					$length = 0;
					while($search)
						{
							if(substr($b,$length,$a_length)==$a)
								{
									$search = false;
									$result = true;
								}elseif($length>$b_length){
									print("<b>Websatellite: A: $a B: $b ($length>$b_length)</b>");
									$result = false;
									$search = false;
								}
							print("<b><br>Websatellite: ($a_length) ".substr($b,$length,$a_length)."==$a</b>");
							$length++;
						}
					return $result;
			}