[#6030] Simplifying and showing code

Author: weaverryan

reference/constraints/Blank.rst

@@ -1,18 +1,18 @@
 Blank
 =====
 
-Validates that a value is blank, defined as equal to a blank string or equal
-to ``null``. To force that a value strictly be equal to ``null``, see the
-:doc:`/reference/constraints/IsNull` constraint.
+Validates that a value is blank - meaning equal to an empty string or ``null``::
+
+    if ('' !== $value && null !== $value) {
+        // validation will fail
+    }
 
+To force that a value strictly be equal to ``null``, see the
+:doc:`/reference/constraints/IsNull` constraint.
 
-.. tip::
 
-    To force that a value is *not* blank, see
-    :doc:`/reference/constraints/NotBlank`. But be careful as ``NotBlank`` is
-    *not* strictly the opposite of ``Blank``. Emtpy array and strictly
-    ``false`` are considered blank by the ``NotBlank`` validator but not by the
-    ``Blank`` validator.
+To force that a value is *not* blank, see :doc:`/reference/constraints/NotBlank`.
+But be careful as ``NotBlank`` is *not* strictly the opposite of ``Blank``.
 
 +----------------+---------------------------------------------------------------------+
 | Applies to     | :ref:`property or method <validation-property-target>`              |

reference/constraints/NotBlank.rst

@@ -1,8 +1,13 @@
 NotBlank
 ========
 
-Validates that a value is not blank, defined as not strictly ``false``,
-not equal to a blank string, not an empty array and also not equal to ``null``.
+Validates that a value is not blank - meaning not equal to a blank string,
+a blank array or ``null``::
+
+    if (false === $value || (empty($value) && '0' != $value)) {
+        // validation will fail
+    }
+
 To force that a value is simply not equal to ``null``, see the
 :doc:`/reference/constraints/NotNull` constraint.