New form_validation rule: 'differs'

Added new validation rule 'differs'. It checks if the value of a field differs from the value of another field.

1 files changed, 13 insertions, 0 deletions

diff --git a/system/libraries/Form_validation.php b/system/libraries/Form_validation.php
index fccc12afa..6db5bb495 100644
--- a/system/libraries/Form_validation.php
+++ b/system/libraries/Form_validation.php
@@ -971,6 +971,19 @@ class CI_Form_validation {
 	// --------------------------------------------------------------------
 
 	/**
+	 * Differs from another field
+	 *
+	 * @param	string
+	 * @param	string	field
+	 * @return	bool
+	 */
+	public function differs($str, $field)
+	{
+		return ! (isset($this->_field_data[$field]) && $this->_field_data[$field]['postdata'] === $str);
+	}
+
+	// --------------------------------------------------------------------
+	/**
 	 * Is Unique
 	 *
 	 * Check if the input value doesn't already exist