diff --git a/reference/eio/book.xml b/reference/eio/book.xml
index 89332db6de..9ff54fe812 100644
--- a/reference/eio/book.xml
+++ b/reference/eio/book.xml
@@ -115,15 +115,15 @@ eio_event_loop();
    <programlisting role="php"><![CDATA[
 <?php
 function my_eio_poll($fd, $events, $arg) {
-	/* Some libevent regulation might go here .. */
-	if (eio_nreqs()) {
-		eio_poll();
-	}
-	/* .. and here */
+    /* Some libevent regulation might go here .. */
+    if (eio_nreqs()) {
+        eio_poll();
+    }
+    /* .. and here */
 }
 
 function my_res_cb($d, $r) {
-	var_dump($r); var_dump($d);
+    var_dump($r); var_dump($d);
 }
 
 $base = event_base_new();
diff --git a/reference/eio/examples.xml b/reference/eio/examples.xml
index ef0d437237..e9ca8d96cb 100644
--- a/reference/eio/examples.xml
+++ b/reference/eio/examples.xml
@@ -194,15 +194,15 @@ bool(true)
    <programlisting role="php"><![CDATA[
 <?php
 function my_eio_poll($fd, $events, $arg) {
-	/* Some libevent regulation might go here .. */
-	if (eio_nreqs()) {
-		eio_poll();
-	}
-	/* .. and here */
+    /* Some libevent regulation might go here .. */
+    if (eio_nreqs()) {
+        eio_poll();
+    }
+    /* .. and here */
 }
 
 function my_nop_cb($d, $r) {
-	var_dump($r); var_dump($d);
+    var_dump($r); var_dump($d);
 }
 
 $base = event_base_new();
diff --git a/reference/eio/functions/eio-get-event-stream.xml b/reference/eio/functions/eio-get-event-stream.xml
index 398cd6c2d9..9a9906ca6f 100644
--- a/reference/eio/functions/eio-get-event-stream.xml
+++ b/reference/eio/functions/eio-get-event-stream.xml
@@ -42,15 +42,15 @@
 <![CDATA[
 <?php
 function my_eio_poll($fd, $events, $arg) {
-	/* Some libevent regulation might go here .. */
-	if (eio_nreqs()) {
-		eio_poll();
-	}
-	/* .. and here */
+    /* Some libevent regulation might go here .. */
+    if (eio_nreqs()) {
+        eio_poll();
+    }
+    /* .. and here */
 }
 
 function my_res_cb($d, $r) {
-	var_dump($r); var_dump($d);
+    var_dump($r); var_dump($d);
 }
 
 $base = event_base_new();