Describe behavior of static variables inside anonymous functions (#4377)

Author: pereorga

language/variables.xml

@@ -527,6 +527,35 @@ function foo(){
     </example>
    </para>
 
+   <simpara>
+    Static variables inside anonymous functions persist only within that
+    specific function instance. If the anonymous function is recreated on each
+    call, the static variable will be reinitialized.
+   </simpara>
+   <example>
+    <title>Static variables in anonymous functions</title>
+    <programlisting role="php">
+<![CDATA[
+<?php
+function exampleFunction($input) {
+    $result = (static function () use ($input) {
+        static $counter = 0;
+        $counter++;
+        return "Input: $input, Counter: $counter\n";
+    });
+
+    return $result();
+}
+
+// Calls to exampleFunction will recreate the anonymous function, so the static
+// variable does not retain its value.
+echo exampleFunction('A'); // Outputs: Input: A, Counter: 1
+echo exampleFunction('B'); // Outputs: Input: B, Counter: 1
+?>
+]]>
+    </programlisting>
+   </example>
+
    <para>
     As of PHP 8.1.0, when a method using static variables is inherited (but not overridden),
     the inherited method will now share static variables with the parent method.