From 32c0ccbd46797c912152df9de57d1c6bdf71f041 Mon Sep 17 00:00:00 2001
From: Christopher Kanitz <ck@luehrsen-heinrich.de>
Date: Thu, 20 Jun 2019 12:03:00 +0200
Subject: [PATCH 01/17] Create OperatorSpacingStandard.xml

---
 .../WhiteSpace/OperatorSpacingStandard.xml    | 36 +++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml

diff --git a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
new file mode 100644
index 0000000000..4cefaafadb
--- /dev/null
+++ b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
@@ -0,0 +1,36 @@
+<documentation title="Operator Spacing">
+    <standard>
+    <![CDATA[
+    Always put spaces after commas, and on both sides of logical, comparison, string and assignment operators.
+    ]]>
+    </standard>
+    <code_comparison>
+        <code title="Valid: one space before and after the operator.">
+        <![CDATA[
+if ( $a === $b && $b === $c ) {}
+if ( ! $var ) {}
+        ]]>
+        </code>
+		<code title="Valid: multiline is okay, too.">
+        <![CDATA[
+if ( $a === $b
+	&& $b === $c
+) {}
+        ]]>
+        </code>
+	</code_comparison>
+	<code_comparison>
+		<code title="Invalid: too little space.">
+		<![CDATA[
+if ( $a===$b &&$b ===$c ) {}
+if ( !$var ) {}
+		]]>
+		</code>
+		<code title="Invalid: too much space.">
+		<![CDATA[
+if ( $a === $b   &&   $b ===$c ) {}
+if (  ! $var  ) {}
+		]]>
+		</code>
+	</code_comparison>
+</documentation>

From af4db405a41ef586ebf796b2a06cf5ee0137f8e1 Mon Sep 17 00:00:00 2001
From: Christopher Kanitz <ck@luehrsen-heinrich.de>
Date: Tue, 25 Jun 2019 16:24:30 +0200
Subject: [PATCH 02/17] only indent with spaces

---
 .../WhiteSpace/OperatorSpacingStandard.xml    | 26 +++++++++----------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
index 4cefaafadb..6aa6bcb6c7 100644
--- a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
+++ b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
@@ -11,26 +11,26 @@ if ( $a === $b && $b === $c ) {}
 if ( ! $var ) {}
         ]]>
         </code>
-		<code title="Valid: multiline is okay, too.">
+        <code title="Valid: multiline is okay, too.">
         <![CDATA[
 if ( $a === $b
-	&& $b === $c
+    && $b === $c
 ) {}
         ]]>
         </code>
-	</code_comparison>
-	<code_comparison>
-		<code title="Invalid: too little space.">
-		<![CDATA[
+    </code_comparison>
+    <code_comparison>
+        <code title="Invalid: too little space.">
+        <![CDATA[
 if ( $a===$b &&$b ===$c ) {}
 if ( !$var ) {}
-		]]>
-		</code>
-		<code title="Invalid: too much space.">
-		<![CDATA[
+        ]]>
+        </code>
+        <code title="Invalid: too much space.">
+        <![CDATA[
 if ( $a === $b   &&   $b ===$c ) {}
 if (  ! $var  ) {}
-		]]>
-		</code>
-	</code_comparison>
+        ]]>
+        </code>
+    </code_comparison>
 </documentation>

From d1180d963cd8f72d3d5796dfcb383895ff531840 Mon Sep 17 00:00:00 2001
From: Christopher Kanitz <ck@luehrsen-heinrich.de>
Date: Tue, 25 Jun 2019 16:25:12 +0200
Subject: [PATCH 03/17] adjust invalid example

---
 WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
index 6aa6bcb6c7..3db7236bb2 100644
--- a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
+++ b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
@@ -22,7 +22,7 @@ if ( $a === $b
     <code_comparison>
         <code title="Invalid: too little space.">
         <![CDATA[
-if ( $a===$b &&$b ===$c ) {}
+if ( $a===$b &&$b ===   $c ) {}
 if ( !$var ) {}
         ]]>
         </code>

From e73eaebb70275f93c4db7f0cce5540dfd79672b0 Mon Sep 17 00:00:00 2001
From: Christopher Kanitz <ckanitz@users.noreply.github.com>
Date: Tue, 2 Jul 2019 10:41:19 +0200
Subject: [PATCH 04/17] Update
 WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml

Co-Authored-By: Juliette <663378+jrfnl@users.noreply.github.com>
---
 WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
index 3db7236bb2..99bec8f37e 100644
--- a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
+++ b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
@@ -1,7 +1,7 @@
 <documentation title="Operator Spacing">
     <standard>
     <![CDATA[
-    Always put spaces after commas, and on both sides of logical, comparison, string and assignment operators.
+    Always put a space after commas, and on both sides of logical, comparison, string and assignment operators.
     ]]>
     </standard>
     <code_comparison>

From 26253a1d68684f724c0e50754d160bb7ccd971f4 Mon Sep 17 00:00:00 2001
From: Christopher Kanitz <ckanitz@users.noreply.github.com>
Date: Tue, 2 Jul 2019 10:41:28 +0200
Subject: [PATCH 05/17] Update
 WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml

Co-Authored-By: Juliette <663378+jrfnl@users.noreply.github.com>
---
 WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
index 99bec8f37e..0e2c434112 100644
--- a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
+++ b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
@@ -7,7 +7,7 @@
     <code_comparison>
         <code title="Valid: one space before and after the operator.">
         <![CDATA[
-if ( $a === $b && $b === $c ) {}
+if ( $a<em> === </em>$b<em> && </em>$b<em> === </em>$c ) {}
 if ( ! $var ) {}
         ]]>
         </code>

From e98bb648af90ebc83035c33d27c1cceed6b9463e Mon Sep 17 00:00:00 2001
From: Christopher Kanitz <ckanitz@users.noreply.github.com>
Date: Tue, 2 Jul 2019 10:41:36 +0200
Subject: [PATCH 06/17] Update
 WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml

Co-Authored-By: Juliette <663378+jrfnl@users.noreply.github.com>
---
 WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
index 0e2c434112..e3ec881ea0 100644
--- a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
+++ b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
@@ -13,7 +13,7 @@ if ( ! $var ) {}
         </code>
         <code title="Valid: multiline is okay, too.">
         <![CDATA[
-if ( $a === $b
+if ( $a === $b<em>
     && $b === $c
 ) {}
         ]]>

From 4b8374191e2ba4c8db9961bf3a67e3082d3000d4 Mon Sep 17 00:00:00 2001
From: Christopher Kanitz <ckanitz@users.noreply.github.com>
Date: Tue, 2 Jul 2019 10:41:47 +0200
Subject: [PATCH 07/17] Update
 WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml

Co-Authored-By: Juliette <663378+jrfnl@users.noreply.github.com>
---
 WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
index e3ec881ea0..b6ed0b152f 100644
--- a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
+++ b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
@@ -14,7 +14,7 @@ if ( ! $var ) {}
         <code title="Valid: multiline is okay, too.">
         <![CDATA[
 if ( $a === $b<em>
-    && $b === $c
+    && </em>$b === $c
 ) {}
         ]]>
         </code>

From d13feb70ecb22adc56abd6e0918bb72daeb23977 Mon Sep 17 00:00:00 2001
From: Christopher Kanitz <ckanitz@users.noreply.github.com>
Date: Tue, 2 Jul 2019 10:41:56 +0200
Subject: [PATCH 08/17] Update
 WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml

Co-Authored-By: Juliette <663378+jrfnl@users.noreply.github.com>
---
 WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
index b6ed0b152f..5db7adb297 100644
--- a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
+++ b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
@@ -22,7 +22,7 @@ if ( $a === $b<em>
     <code_comparison>
         <code title="Invalid: too little space.">
         <![CDATA[
-if ( $a===$b &&$b ===   $c ) {}
+if ( $a<em>===</em>$b<em> &&</em>$b<em> ===</em>$c ) {}
 if ( !$var ) {}
         ]]>
         </code>

From 7fc6865a47ba515d7b67dd1aa4fdf3d2a49011a6 Mon Sep 17 00:00:00 2001
From: Christopher Kanitz <ckanitz@users.noreply.github.com>
Date: Tue, 2 Jul 2019 10:42:05 +0200
Subject: [PATCH 09/17] Update
 WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml

Co-Authored-By: Juliette <663378+jrfnl@users.noreply.github.com>
---
 WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
index 5db7adb297..59e3f33db1 100644
--- a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
+++ b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
@@ -28,7 +28,7 @@ if ( !$var ) {}
         </code>
         <code title="Invalid: too much space.">
         <![CDATA[
-if ( $a === $b   &&   $b ===$c ) {}
+if ( $a === $b<em>   &&   </em>$b<em> ===      </em>$c ) {}
 if (  ! $var  ) {}
         ]]>
         </code>

From 4c5f5c6fda5c4a743bad1e37239b2b82e9bb33ee Mon Sep 17 00:00:00 2001
From: Christopher Kanitz <ckanitz@users.noreply.github.com>
Date: Tue, 2 Jul 2019 10:42:12 +0200
Subject: [PATCH 10/17] Update
 WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml

Co-Authored-By: Juliette <663378+jrfnl@users.noreply.github.com>
---
 WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
index 59e3f33db1..a053fa46d2 100644
--- a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
+++ b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
@@ -29,7 +29,7 @@ if ( !$var ) {}
         <code title="Invalid: too much space.">
         <![CDATA[
 if ( $a === $b<em>   &&   </em>$b<em> ===      </em>$c ) {}
-if (  ! $var  ) {}
+if (<em>  ! </em>$var ) {}
         ]]>
         </code>
     </code_comparison>

From 6624d7da43256b5c7082a00868bc73bb345be3b5 Mon Sep 17 00:00:00 2001
From: Christopher Kanitz <ckanitz@users.noreply.github.com>
Date: Tue, 2 Jul 2019 10:42:21 +0200
Subject: [PATCH 11/17] Update
 WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml

Co-Authored-By: Juliette <663378+jrfnl@users.noreply.github.com>
---
 WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
index a053fa46d2..d752e41933 100644
--- a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
+++ b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
@@ -23,7 +23,7 @@ if ( $a === $b<em>
         <code title="Invalid: too little space.">
         <![CDATA[
 if ( $a<em>===</em>$b<em> &&</em>$b<em> ===</em>$c ) {}
-if ( !$var ) {}
+if (<em> !</em>$var ) {}
         ]]>
         </code>
         <code title="Invalid: too much space.">

From c40d6b3640fd3133bf6b8dd2181920e912d0a492 Mon Sep 17 00:00:00 2001
From: Christopher Kanitz <ckanitz@users.noreply.github.com>
Date: Tue, 2 Jul 2019 10:42:28 +0200
Subject: [PATCH 12/17] Update
 WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml

Co-Authored-By: Juliette <663378+jrfnl@users.noreply.github.com>
---
 WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
index d752e41933..9f5f8fd14b 100644
--- a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
+++ b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
@@ -8,7 +8,7 @@
         <code title="Valid: one space before and after the operator.">
         <![CDATA[
 if ( $a<em> === </em>$b<em> && </em>$b<em> === </em>$c ) {}
-if ( ! $var ) {}
+if (<em> ! </em>$var ) {}
         ]]>
         </code>
         <code title="Valid: multiline is okay, too.">

From 4f405c4489f292398ffcb9dfadf6f258e9899873 Mon Sep 17 00:00:00 2001
From: Christopher Kanitz <ck@luehrsen-heinrich.de>
Date: Tue, 2 Jul 2019 10:52:00 +0200
Subject: [PATCH 13/17] rearange valid/invalid examples

---
 .../WhiteSpace/OperatorSpacingStandard.xml    | 26 ++++++++++++-------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
index 9f5f8fd14b..72511c4bc5 100644
--- a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
+++ b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
@@ -11,25 +11,31 @@ if ( $a<em> === </em>$b<em> && </em>$b<em> === </em>$c ) {}
 if (<em> ! </em>$var ) {}
         ]]>
         </code>
-        <code title="Valid: multiline is okay, too.">
+        <code title="Invalid: too much/little space.">
         <![CDATA[
-if ( $a === $b<em>
-    && </em>$b === $c
-) {}
+// Too much space.
+if ( $a === $b<em>   &&   </em>$b<em> ===      </em>$c ) {}
+if (<em>  ! </em>$var ) {}
+
+// Too little space.
+if ( $a<em>===</em>$b<em> &&</em>$b<em> ===</em>$c ) {}
+if (<em> !</em>$var ) {}
         ]]>
         </code>
     </code_comparison>
     <code_comparison>
-        <code title="Invalid: too little space.">
+        <code title="Valid: multiline is okay, too.">
         <![CDATA[
-if ( $a<em>===</em>$b<em> &&</em>$b<em> ===</em>$c ) {}
-if (<em> !</em>$var ) {}
+if ( $a === $b<em>
+    && </em>$b === $c
+) {}
         ]]>
         </code>
-        <code title="Invalid: too much space.">
+		<code title="Invalid: too much space after operator on new line.">
         <![CDATA[
-if ( $a === $b<em>   &&   </em>$b<em> ===      </em>$c ) {}
-if (<em>  ! </em>$var ) {}
+if ( $a === $b<em>
+    &&     </em>$b === $c
+) {}
         ]]>
         </code>
     </code_comparison>

From aab1385e64bb947aa0d9f3d35379b68467cd06ce Mon Sep 17 00:00:00 2001
From: Christopher Kanitz <ck@luehrsen-heinrich.de>
Date: Mon, 15 Jul 2019 11:10:50 +0200
Subject: [PATCH 14/17] get rid of tabstops

---
 WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
index 72511c4bc5..2439b99648 100644
--- a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
+++ b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
@@ -31,7 +31,7 @@ if ( $a === $b<em>
 ) {}
         ]]>
         </code>
-		<code title="Invalid: too much space after operator on new line.">
+        <code title="Invalid: too much space after operator on new line.">
         <![CDATA[
 if ( $a === $b<em>
     &&     </em>$b === $c

From 5d6e552600fe6625ec7092a8c68c210dbf267242 Mon Sep 17 00:00:00 2001
From: Christopher Kanitz <ck@luehrsen-heinrich.de>
Date: Mon, 15 Jul 2019 11:11:50 +0200
Subject: [PATCH 15/17] adjust example description

---
 WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
index 2439b99648..9e287ae2b9 100644
--- a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
+++ b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
@@ -24,7 +24,7 @@ if (<em> !</em>$var ) {}
         </code>
     </code_comparison>
     <code_comparison>
-        <code title="Valid: multiline is okay, too.">
+        <code title="Valid: a new line instead of a space is okay too.">
         <![CDATA[
 if ( $a === $b<em>
     && </em>$b === $c

From b46e8a543e1dc09730ccfe8a1627e8cef89dea63 Mon Sep 17 00:00:00 2001
From: Christopher Kanitz <ck@luehrsen-heinrich.de>
Date: Mon, 15 Jul 2019 11:16:56 +0200
Subject: [PATCH 16/17] rephrase the description text

---
 WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
index 9e287ae2b9..d4a4ada5d8 100644
--- a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
+++ b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
@@ -1,7 +1,7 @@
 <documentation title="Operator Spacing">
     <standard>
     <![CDATA[
-    Always put a space after commas, and on both sides of logical, comparison, string and assignment operators.
+    Always put one space on both sides of operators.
     ]]>
     </standard>
     <code_comparison>

From 030cd5ff6e3059a3ba75918718a8c9551587769c Mon Sep 17 00:00:00 2001
From: jrfnl <jrfnl@users.noreply.github.com>
Date: Mon, 16 May 2022 15:22:38 +0200
Subject: [PATCH 17/17] Docs/OperatorSpacing: minor fixes after review

* Be more explicit about which operators are covered by the sniff and what is expected.
* Add a code sample showing that for assignment operators, only the space after the operator is checked (as the space before is determined by alignment).
---
 .../WhiteSpace/OperatorSpacingStandard.xml    | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
index d4a4ada5d8..ca17e57ff5 100644
--- a/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
+++ b/WordPress/Docs/WhiteSpace/OperatorSpacingStandard.xml
@@ -1,11 +1,12 @@
 <documentation title="Operator Spacing">
     <standard>
     <![CDATA[
-    Always put one space on both sides of operators.
+    Always put one space on both sides of logical, comparison and concatenation operators.
+    Always put one space after an assignment operator.
     ]]>
     </standard>
     <code_comparison>
-        <code title="Valid: one space before and after the operator.">
+        <code title="Valid: one space before and after an operator.">
         <![CDATA[
 if ( $a<em> === </em>$b<em> && </em>$b<em> === </em>$c ) {}
 if (<em> ! </em>$var ) {}
@@ -39,4 +40,18 @@ if ( $a === $b<em>
         ]]>
         </code>
     </code_comparison>
+    <code_comparison>
+        <code title="Valid: one space after assignment operator.">
+        <![CDATA[
+$a   <em>= </em>'foo';
+$all <em>= </em>'foobar';
+        ]]>
+        </code>
+        <code title="Invalid: too much/little space after assignment operator.">
+        <![CDATA[
+$a   <em>=     </em>'foo';
+$all <em>=</em>'foobar';
+        ]]>
+        </code>
+    </code_comparison>
 </documentation>