Fixed an issue with the lastIndexOf method.

Updated readme.

Author: Martin Brecht-Precht

README.md

@@ -29,45 +29,83 @@ A basic string builder library providing different string methods written in PHP
 require_once('path/to/vendor/autoload.php');
 ```
 
-### Building a string
+### Building and modifying a string
 
 ```{php}
 use Markenwerk\StringBuilder\StringBuilder;
 
-$builder = new StringBuilder();
+$builder = new StringBuilder('rolod muspi meroL');
 $builder
-	->append('a')
+	->reverse()
+	->append(' sit amet, consetetur')
 	->append(12)
 	->append(false)
 	->prepend('b')
-	->remove(1)
-	->replace(0, 'ab')
-	->append(true);
+	->append(true)
+	->insert(1, 'qäs')
+	->replace(6, 2, 'wertz')
+	->setCharAt(4, '2')
+	->delete(0, 2)
+	->delete(40)
+	->deleteCharAt(3);
 
-$string = $builder->build();
-fwrite(STDOUT, 'Result "' . $string . '"' . PHP_EOL);
+$result = $builder->build();
+fwrite(STDOUT, ' 1. Built string                                          ' . $result . PHP_EOL);
 
-$substring = $builder->buildSubstring(0, 2);
-fwrite(STDOUT, 'Substring result from position 0 and size 2 "' . $substring . '"' . PHP_EOL);
+$result = $builder->buildSubstring(5, 2);
+fwrite(STDOUT, ' 2. Built substring                                       ' . $result . PHP_EOL);
 
-$substring = $builder->buildSubstring(1);
-fwrite(STDOUT, 'Substring result from position 1 till the end "' . $substring . '"' . PHP_EOL);
+$result = $builder->buildSubstring(5);
+fwrite(STDOUT, ' 3. Built substring                                       ' . $result . PHP_EOL);
 
-$size = $builder->size();
-fwrite(STDOUT, 'Builder holds "' . $size . '" partial strings' . PHP_EOL);
+$result = $builder->charAt(5);
+fwrite(STDOUT, ' 4. Character                                             ' . $result . PHP_EOL);
+```
+
+will output the following
+
+```{http}
+ 1. Built string                                          ä2wertzem ipsum dolor sit amet, conset
+ 2. Built substring                                       rt
+ 3. Built substring                                       rtzem ipsum dolor sit amet, conset
+ 4. Character                                             r
+```
+
+### Getting string properties
+
+```{php}
+$result = $builder->length();
+fwrite(STDOUT, ' 5. String length                                         ' . $result . PHP_EOL);
+
+$result = $builder->size();
+fwrite(STDOUT, ' 6. Number of bytes                                       ' . $result . PHP_EOL);
+
+$result = $builder->indexOf('e');
+fwrite(STDOUT, ' 7. First occurence of \'e\'                                ' . $result . PHP_EOL);
+
+$result = $builder->indexOf('e', 5);
+fwrite(STDOUT, ' 8. First occurence of \'e\' after position 5               ' . $result . PHP_EOL);
+
+$result = $builder->lastIndexOf('e');
+fwrite(STDOUT, ' 9. Last occurence of \'e\'                                 ' . $result . PHP_EOL);
+
+$result = $builder->lastIndexOf('e', 5);
+fwrite(STDOUT, '10. Last occurence of \'e\' before the 5th last character   ' . $result . PHP_EOL);
 
-$length = $builder->length();
-fwrite(STDOUT, 'Resulting string length is "' . $length . '" characters' . PHP_EOL);
+$result = $builder->contains('ipsum');
+fwrite(STDOUT, '12. Whether the string contains \'ipsum\'                   ' . $result . PHP_EOL);
 ```
 
 will output the following
 
 ```{http}
-Result "ab121"
-Substring result from position 0 and size 2 "ab12"
-Substring result from position 1 till the end "121"
-Builder holds "4" partial strings
-Resulting string length is "5" characters
+ 5. String length                                         38
+ 6. Number of bytes                                       39
+ 7. First occurence of 'e'                                4
+ 8. First occurence of 'e' after position 5               8
+ 9. Last occurence of 'e'                                 37
+10. Last occurence of 'e' before the 5th last character   29
+12. Whether the string contains 'ipsum'                   1
 ```
 
 ---

src/StringBuilder.php

@@ -207,7 +207,7 @@ public function lastIndexOf($string, $offset = 0)
 			->validateScalar($string)
 			->validateEmpty($string)
 			->validateInteger($offset);
-		$index = mb_strrpos($this->string, (string)$string, $offset);
+		$index = mb_strrpos($this->string, (string)$string, -1 * $offset);
 		return $index === false ? null : $index;
 	}