wpsmithtwc · May 17, 2019 15:49 · Jun 18, 2013 · Jun 18, 2013 · Jun 18, 2013 · Jun 18, 2013
diff --git a/wp-meta.php b/wp-meta.php
@@ -1,4 +1,5 @@
 <?php
+// Copied from core for reference
 
 /**
  * Retrieve metadata for the specified object.

diff --git a/wp-post-thumbnail-template.php b/wp-post-thumbnail-template.php
@@ -1,4 +1,5 @@
 <?php
+// Copied from core for reference
 
 /**
  * Retrieve Post Thumbnail ID.

diff --git a/wp-post.php b/wp-post.php
@@ -1,4 +1,5 @@
 <?php
+// Copied from core for reference
 
 /**
  * Retrieve post meta field for a post.

diff --git a/filter-post-thumbnail-id.php b/filter-post-thumbnail-id.php
@@ -4,19 +4,18 @@
  */
 
 add_filter( 'get_post_metadata', function ( $value, $post_id, $meta_key, $single ) {
-    // We want to pass the actual _thumbnail_id into the filter, so requires recursion
-    static $is_recursing = false;
+	// We want to pass the actual _thumbnail_id into the filter, so requires recursion
+	static $is_recursing = false;
 
-    // Only filter if we're not recursing and if it is a post thumbnail ID
-    if ( ! $is_recursing && $meta_key === '_thumbnail_id' ) {
-        $is_recursing = true; // prevent this conditional when get_post_thumbnail_id() is called
-        $value = get_post_thumbnail_id( $post_id );
-        $is_recursing = false;
-        $value = apply_filters( 'post_thumbnail_id', $value, $post_id ); // yay!
-        if ( ! $single ) {
-            $value = array( $value );
-        }
-    }
-    return $value;
+	// Only filter if we're not recursing and if it is a post thumbnail ID
+	if ( ! $is_recursing && $meta_key === '_thumbnail_id' ) {
+		$is_recursing = true; // prevent this conditional when get_post_thumbnail_id() is called
+		$value = get_post_thumbnail_id( $post_id );
+		$is_recursing = false;
+		$value = apply_filters( 'post_thumbnail_id', $value, $post_id ); // yay!
+		if ( ! $single ) {
+			$value = array( $value );
+		}
+	}
+	return $value;
 }, 10, 4);
-
diff --git a/wp-post-thumbnail-template.php b/wp-post-thumbnail-template.php
@@ -9,6 +9,6 @@
  * @return int
  */
 function get_post_thumbnail_id( $post_id = null ) {
-    $post_id = ( null === $post_id ) ? get_the_ID() : $post_id;
+	$post_id = ( null === $post_id ) ? get_the_ID() : $post_id;
 	return get_post_meta( $post_id, '_thumbnail_id', true );
 }
diff --git a/wp-post.php b/wp-post.php
@@ -14,5 +14,5 @@
  *  is true.
  */
 function get_post_meta($post_id, $key = '', $single = false) {
-    return get_metadata('post', $post_id, $key, $single);
+	return get_metadata('post', $post_id, $key, $single);
 }
diff --git a/filter-post-thumbnail-id.php b/filter-post-thumbnail-id.php
@@ -3,7 +3,7 @@
  * How to filter the value that would be returned by get_post_thumbnail_id()
  */
 
-add_filter( 'get_post_metadata', function ($value, $post_id, $meta_key, $single) {
+add_filter( 'get_post_metadata', function ( $value, $post_id, $meta_key, $single ) {
     // We want to pass the actual _thumbnail_id into the filter, so requires recursion
     static $is_recursing = false;
 

diff --git a/filter-post-thumbnail-id.php b/filter-post-thumbnail-id.php
@@ -4,15 +4,18 @@
  */
 
 add_filter( 'get_post_metadata', function ($value, $post_id, $meta_key, $single) {
+    // We want to pass the actual _thumbnail_id into the filter, so requires recursion
     static $is_recursing = false;
+
+    // Only filter if we're not recursing and if it is a post thumbnail ID
     if ( ! $is_recursing && $meta_key === '_thumbnail_id' ) {
-        $is_recursing = true;
+        $is_recursing = true; // prevent this conditional when get_post_thumbnail_id() is called
         $value = get_post_thumbnail_id( $post_id );
-        $value = apply_filters( 'post_thumbnail_id', $value, $post_id );
+        $is_recursing = false;
+        $value = apply_filters( 'post_thumbnail_id', $value, $post_id ); // yay!
         if ( ! $single ) {
             $value = array( $value );
         }
-        $is_recursing = false;
     }
     return $value;
 }, 10, 4);

diff --git a/filter-post-thumbnail-id.php b/filter-post-thumbnail-id.php
@@ -8,7 +8,7 @@
     if ( ! $is_recursing && $meta_key === '_thumbnail_id' ) {
         $is_recursing = true;
         $value = get_post_thumbnail_id( $post_id );
-        $value = apply_filters( 'the_post_thumbnail_id', $value, $post_id );
+        $value = apply_filters( 'post_thumbnail_id', $value, $post_id );
         if ( ! $single ) {
             $value = array( $value );
         }

diff --git a/filter-post-thumbnail-id.php b/filter-post-thumbnail-id.php
@@ -0,0 +1,19 @@
+<?php
+/**
+ * How to filter the value that would be returned by get_post_thumbnail_id()
+ */
+
+add_filter( 'get_post_metadata', function ($value, $post_id, $meta_key, $single) {
+    static $is_recursing = false;
+    if ( ! $is_recursing && $meta_key === '_thumbnail_id' ) {
+        $is_recursing = true;
+        $value = get_post_thumbnail_id( $post_id );
+        $value = apply_filters( 'the_post_thumbnail_id', $value, $post_id );
+        if ( ! $single ) {
+            $value = array( $value );
+        }
+        $is_recursing = false;
+    }
+    return $value;
+}, 10, 4);
+
diff --git a/meta.php → wp-meta.php b/meta.php → wp-meta.php
diff --git a/post-thumbnail-template.php → wp-post-thumbnail-template.php b/post-thumbnail-template.php → wp-post-thumbnail-template.php
diff --git a/post.php → wp-post.php b/post.php → wp-post.php
diff --git a/meta.php b/meta.php
@@ -0,0 +1,52 @@
+<?php
+
+/**
+ * Retrieve metadata for the specified object.
+ *
+ * @since 2.9.0
+ *
+ * @param string $meta_type Type of object metadata is for (e.g., comment, post, or user)
+ * @param int $object_id ID of the object metadata is for
+ * @param string $meta_key Optional. Metadata key. If not specified, retrieve all metadata for
+ *     	the specified object.
+ * @param bool $single Optional, default is false. If true, return only the first value of the
+ * 		specified meta_key. This parameter has no effect if meta_key is not specified.
+ * @return string|array Single metadata value, or array of values
+ */
+function get_metadata($meta_type, $object_id, $meta_key = '', $single = false) {
+	if ( !$meta_type )
+		return false;
+
+	if ( !$object_id = absint($object_id) )
+		return false;
+
+	$check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, $single );
+	if ( null !== $check ) {
+		if ( $single && is_array( $check ) )
+			return $check[0];
+		else
+			return $check;
+	}
+
+	$meta_cache = wp_cache_get($object_id, $meta_type . '_meta');
+
+	if ( !$meta_cache ) {
+		$meta_cache = update_meta_cache( $meta_type, array( $object_id ) );
+		$meta_cache = $meta_cache[$object_id];
+	}
+
+	if ( !$meta_key )
+		return $meta_cache;
+
+	if ( isset($meta_cache[$meta_key]) ) {
+		if ( $single )
+			return maybe_unserialize( $meta_cache[$meta_key][0] );
+		else
+			return array_map('maybe_unserialize', $meta_cache[$meta_key]);
+	}
+
+	if ($single)
+		return '';
+	else
+		return array();
+}
diff --git a/post-thumbnail-template.php b/post-thumbnail-template.php
@@ -0,0 +1,14 @@
+<?php
+
+/**
+ * Retrieve Post Thumbnail ID.
+ *
+ * @since 2.9.0
+ *
+ * @param int $post_id Optional. Post ID.
+ * @return int
+ */
+function get_post_thumbnail_id( $post_id = null ) {
+    $post_id = ( null === $post_id ) ? get_the_ID() : $post_id;
+	return get_post_meta( $post_id, '_thumbnail_id', true );
+}
diff --git a/post.php b/post.php
@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * Retrieve post meta field for a post.
+ *
+ * @since 1.5.0
+ * @uses $wpdb
+ * @link http://codex.wordpress.org/Function_Reference/get_post_meta
+ *
+ * @param int $post_id Post ID.
+ * @param string $key Optional. The meta key to retrieve. By default, returns data for all keys.
+ * @param bool $single Whether to return a single value.
+ * @return mixed Will be an array if $single is false. Will be value of meta data field if $single
+ *  is true.
+ */
+function get_post_meta($post_id, $key = '', $single = false) {
+    return get_metadata('post', $post_id, $key, $single);
+}