Added detect delimiter

Author: bjorn-dcc

README.md

@@ -84,6 +84,12 @@ The following options are available to suit your needs:
 These options could be passed to the `open` and `save` methods, be set using the `options` method, or be set as the
 global default using the static `defaults` method.
 
+The delimiter can be detected for a file by using the `detectDelimiter` method like this:
+
+```
+CsvCollection::detectDelimiter($path);
+```
+
 #### Header
 
 When using a header, lines will contain an associated array. Otherwise, lines will contain an indexed array.

src/CsvCollection.php

@@ -156,6 +156,24 @@ public function push(string $file, array $line, array $options = []): self
         return $this->open($file, $options);
     }
 
+    /**
+     * @param string $file Path to the CSV file
+     * @return string Delimiter
+     */
+    public static function detectDelimiter(string $file): string
+    {
+        $delimiters = [";" => 0, "," => 0, "\t" => 0, "|" => 0];
+
+        $handle = fopen($file, "r");
+        $firstLine = fgets($handle);
+        fclose($handle);
+        foreach ($delimiters as $delimiter => &$count) {
+            $count = count(str_getcsv($firstLine, $delimiter));
+        }
+
+        return array_search(max($delimiters), $delimiters, true);
+    }
+
     /**
      * Set the collection's options.
      *