added conditional

mb_strlen if function exists

Author: Hube2

acf-input-counter.php

@@ -78,7 +78,11 @@ public function render_field($field) {
 				// only run on text and text area fields when maxlength is set
 				return;
 			}
-			$len = mb_strlen($field['value']);
+			if (function_exists('mb_strlen')) {
+				$len = mb_strlen($field['value']);
+			} else {
+				$len = strlen($field['value']);
+			}
 			$max = $field['maxlength'];
 
 			$classes 	= apply_filters('acf-input-counter/classes', array());
@@ -181,4 +185,4 @@ function show_blunt_plugins_list_meta_box() {
 		}
 	} // end if !function_exists
 
-?>
+?>