docs: fix form_helper.rst

user_guide_src/source/helpers/form_helper.rst

@@ -9,25 +9,28 @@ forms.
     :local:
     :depth: 2
 
+*************
 Configuration
-=============
+*************
 
-Since ``v4.3.0``, void HTML elements (e.g. ``<input>``) in ``form_helper`` functions have been changed to be HTML5-compatible by default and if you need to be compatible with XHTML, you must set the ``$html5`` property in **app/Config/DocTypes.php** to ``false``.
+Since v4.3.0, void HTML elements (e.g. ``<input>``) in ``form_helper`` functions have been changed to be HTML5-compatible by default and if you need to be compatible with XHTML, you must set the ``$html5`` property in **app/Config/DocTypes.php** to ``false``.
 
+*******************
 Loading this Helper
-===================
+*******************
 
 This helper is loaded using the following code:
 
 .. literalinclude:: form_helper/001.php
 
-Escaping field values
-=====================
+*********************
+Escaping Field Values
+*********************
 
 You may need to use HTML and characters such as quotes within your form
 elements. In order to do that safely, you'll need to use
 :doc:`common function <../general/common_functions>`
-:func:`esc()`.
+:php:func:`esc()`.
 
 Consider the following example:
 
@@ -37,16 +40,17 @@ Since the above string contains a set of quotes, it will cause the form
 to break. The :php:func:`esc()` function converts HTML special
 characters so that it can be used safely::
 
-    <input type="text" name="myfield" value="<?= esc($string) ?>" />
+    <input type="text" name="myfield" value="<?= esc($string) ?>">
 
 .. note:: If you use any of the form helper functions listed on this page,
     and you pass values as an associative array,
     the form values will be automatically escaped, so there is no need
     to call this function. Use it only if you are creating your own
     form elements, which you would pass as strings.
 
+*******************
 Available Functions
-===================
+*******************
 
 The following functions are available:
 
@@ -99,14 +103,14 @@ The following functions are available:
 
             <form action="http://example.com/index.php/email/send" class="email" id="myform" method="post" accept-charset="utf-8">
 
-        If CSRF filter is turned on ``form_open()`` will generate CSRF field at the beginning of the form. You can specify ID of this field by passing csrf_id as one of the ``$attribute`` array:
+        If :ref:`CSRF <cross-site-request-forgery>` filter is turned on ``form_open()`` will generate CSRF field at the beginning of the form. You can specify ID of this field by passing csrf_id as one of the ``$attribute`` array:
 
         .. literalinclude:: form_helper/007.php
 
         will return::
 
             <form action="http://example.com/index.php/u/sign-up" method="post" accept-charset="utf-8">
-            <input type="hidden" id="my-id" name="csrf_field" value="964ede6e0ae8a680f7b8eab69136717d" />
+            <input type="hidden" id="my-id" name="csrf_field" value="964ede6e0ae8a680f7b8eab69136717d">
 
         .. note:: To use auto-generation of CSRF field, you need to turn CSRF filter on to the form page. In most cases it is requested using the ``GET`` method.
 
@@ -122,8 +126,8 @@ The following functions are available:
         The above example would create a form similar to this::
 
             <form action="http://example.com/index.php/email/send" method="post" accept-charset="utf-8">
-                <input type="hidden" name="username" value="Joe" />
-                <input type="hidden" name="member_id" value="234" />
+                <input type="hidden" name="username" value="Joe">
+                <input type="hidden" name="member_id" value="234">
 
 .. php:function:: form_open_multipart([$action = ''[, $attributes = ''[, $hidden = []]]])
 
@@ -457,7 +461,7 @@ The following functions are available:
 
     Example::
 
-        <input type="text" name="quantity" value="<?= set_value('quantity', '0') ?>" size="50" />
+        <input type="text" name="quantity" value="<?= set_value('quantity', '0') ?>" size="50">
 
     The above form will show "0" when loaded for the first time.
 
@@ -500,8 +504,8 @@ The following functions are available:
 
     Example::
 
-        <input type="checkbox" name="mycheck" value="1" <?= set_checkbox('mycheck', '1') ?> />
-        <input type="checkbox" name="mycheck" value="2" <?= set_checkbox('mycheck', '2') ?> />
+        <input type="checkbox" name="mycheck" value="1" <?= set_checkbox('mycheck', '1') ?>>
+        <input type="checkbox" name="mycheck" value="2" <?= set_checkbox('mycheck', '2') ?>>
 
 .. php:function:: set_radio($field[, $value = ''[, $default = false]])
 
@@ -516,8 +520,8 @@ The following functions are available:
 
     Example::
 
-        <input type="radio" name="myradio" value="1" <?= set_radio('myradio', '1', true) ?> />
-        <input type="radio" name="myradio" value="2" <?= set_radio('myradio', '2') ?> />
+        <input type="radio" name="myradio" value="1" <?= set_radio('myradio', '1', true) ?>>
+        <input type="radio" name="myradio" value="2" <?= set_radio('myradio', '2') ?>>
 
 .. php:function:: validation_errors()