From 301f6da3e6efb50727d0a95fb97b285ee8a7398f Mon Sep 17 00:00:00 2001
From: Susann Sgorzaly <sgorzaly@portrino.com>
Date: Tue, 13 Feb 2018 17:18:01 +0100
Subject: [PATCH] init new functionality to identify datatypes of columns

---
 parsecsv.lib.php | 93 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)

diff --git a/parsecsv.lib.php b/parsecsv.lib.php
index beffd1e..7ade228 100644
--- a/parsecsv.lib.php
+++ b/parsecsv.lib.php
@@ -322,6 +322,15 @@ class parseCSV {
      */
     public $data = array();
 
+    /**
+     * Datatypes
+     * Datatypes of CSV data-columns
+     *
+     * @access public
+     * @var array
+     */
+    public $data_types = array();
+
     /**
      * Constructor
      * Class constructor
@@ -535,6 +544,90 @@ class parseCSV {
         return $this->delimiter;
     }
 
+    /**
+     * Check data type
+     * Check for possible data types for one field value string.
+     *
+     * @access private
+     *
+     * @param  [string] $value cell value
+     *
+     * @return [string]
+     */
+    private function getDatatypeFromString($value){
+        $value = trim((string) $value);
+
+        if (empty($value)){
+            return 'unknown';
+        }
+
+        if (preg_match('/^(?i:true|false)$/', $value)){
+            return 'boolean';
+        }
+
+        if (preg_match('/^[-+]?[0-9]\d*$/', $value)){
+            return 'integer';
+        }
+
+        if (preg_match('/^[+-]?([0-9]*[.])?([0-9]|[.][0-9])+$/', $value)){
+            return 'float';
+        }
+
+        if ((bool)strtotime($value)){
+            return 'date';
+        }
+
+        return 'string';
+    }
+    /**
+     * Check data type for one column.
+     * Check for most commonly data type for one column.
+     *
+     * @access private
+     *
+     * @param  [array] $datatypes
+     *
+     * @return [string|false]
+     */
+    private function getMostCommonlyDataypeForColumn($datatypes){
+        if (isset($datatypes['unknown'])){
+            unset($datatypes['unknown']);
+        }
+
+        $typesFreq = array_count_values($datatypes);
+        arsort($typesFreq);
+        reset($typesFreq);
+
+        return key($typesFreq);
+
+    }
+
+    /**
+     * Check data type foreach Column
+     * Check data type for each column and returns the most commonly.
+     *
+     * @access public
+     *
+     * @return [array|bool]
+     */
+    public function getDatatypes(){
+        if (empty($this->data)){
+            $this->data = $this->parse_string();
+        }
+
+        $result = [];
+        foreach ($this->titles as $cName){
+            $column = array_column($this->data, $cName);
+            $cDatatypes = array_map(array($this,'getDatatypeFromString'), $column);
+
+            $result[$cName] = $this->getMostCommonlyDataypeForColumn($cDatatypes);
+        }
+
+        $this->data_types = $result;
+
+        return !empty($this->data_types) ? $this->data_types : false;
+    }
+
     // ==============================================
     // ----- [ Core Functions ] ---------------------
     // ==============================================