Merge branch 'feature/59' into develop

Close #59

Author: weierophinney

src/Compress/Bz2.php

@@ -135,7 +135,7 @@ public function decompress($content)
         $archive = $this->getArchive();
 
         //check if there are null byte characters before doing a file_exists check
-        if (! strstr($content, "\0") && file_exists($content)) {
+        if (false === strpos($content, "\0") && file_exists($content)) {
             $archive = $content;
         }
 

src/Compress/Gz.php

@@ -167,7 +167,7 @@ public function decompress($content)
         $mode    = $this->getMode();
 
         //check if there are null byte characters before doing a file_exists check
-        if (! strstr($content, "\0") && file_exists($content)) {
+        if (false === strpos($content, "\0") && file_exists($content)) {
             $archive = $content;
         }
 

src/PregReplace.php

@@ -154,7 +154,7 @@ protected function validatePattern($pattern)
             return true;
         }
 
-        if (false !== strstr($matches['modifier'], 'e')) {
+        if (false !== strpos($matches['modifier'], 'e')) {
             throw new Exception\InvalidArgumentException(sprintf(
                 'Pattern for a PregReplace filter may not contain the "e" pattern modifier; received "%s"',
                 $pattern