diff --git a/controllers/ManageAlbums.php b/controllers/ManageAlbums.php
index e725db1..248e369 100644
--- a/controllers/ManageAlbums.php
+++ b/controllers/ManageAlbums.php
@@ -35,18 +35,14 @@ class ManageAlbums extends HTMLController
 				'tag' => [
 					'header' => 'Album',
 					'is_sortable' => true,
-					'format' => [
-						'link' => BASEURL . '/editalbum/?id={ID_TAG}',
-						'data' => 'tag',
-					],
+					'link' => BASEURL . '/editalbum/?id={ID_TAG}',
+					'value' => 'tag',
 				],
 				'slug' => [
 					'header' => 'Slug',
 					'is_sortable' => true,
-					'format' => [
-						'link' => BASEURL . '/editalbum/?id={ID_TAG}',
-						'data' => 'slug',
-					],
+					'link' => BASEURL . '/editalbum/?id={ID_TAG}',
+					'value' => 'slug',
 				],
 				'count' => [
 					'header' => '# Photos',
diff --git a/controllers/ManageAssets.php b/controllers/ManageAssets.php
index 3f5923b..59895ff 100644
--- a/controllers/ManageAssets.php
+++ b/controllers/ManageAssets.php
@@ -38,40 +38,33 @@ class ManageAssets extends HTMLController
 				'checkbox' => [
 					'header' => '<input type="checkbox" id="selectall">',
 					'is_sortable' => false,
-					'format' => [
-						'type' => 'function',
-						'data' => function($row) {
-							return '<input type="checkbox" class="asset_select" name="delete[]" value="' . $row['id_asset'] . '">';
-						},
-					],
+					'format' => fn($row) =>
+						'<input type="checkbox" class="asset_select" name="delete[]" value="' . $row['id_asset'] . '">',
 				],
 				'thumbnail' => [
 					'header' => '&nbsp;',
 					'is_sortable' => false,
 					'cell_class' => 'text-center',
-					'format' => [
-						'type' => 'function',
-						'data' => function($row) {
-							$asset = Image::byRow($row);
-							$width = $height = 65;
-							if ($asset->isImage())
-							{
-								if ($asset->isPortrait())
-									$width = null;
-								else
-									$height = null;
-
-								$thumb = $asset->getThumbnailUrl($width, $height);
-							}
+					'format' => function($row) {
+						$asset = Image::byRow($row);
+						$width = $height = 65;
+						if ($asset->isImage())
+						{
+							if ($asset->isPortrait())
+								$width = null;
 							else
-								$thumb = BASEURL . '/images/nothumb.svg';
+								$height = null;
 
-							$width = isset($width) ? $width . 'px' : 'auto';
-							$height = isset($height) ? $height . 'px' : 'auto';
+							$thumb = $asset->getThumbnailUrl($width, $height);
+						}
+						else
+							$thumb = BASEURL . '/images/nothumb.svg';
 
-							return sprintf('<img src="%s" style="width: %s; height: %s;">', $thumb, $width, $height);
-						},
-					],
+						$width = isset($width) ? $width . 'px' : 'auto';
+						$height = isset($height) ? $height . 'px' : 'auto';
+
+						return sprintf('<img src="%s" style="width: %s; height: %s;">', $thumb, $width, $height);
+					},
 				],
 				'id_asset' => [
 					'value' => 'id_asset',
@@ -87,38 +80,29 @@ class ManageAssets extends HTMLController
 					'value' => 'filename',
 					'header' => 'Filename',
 					'is_sortable' => true,
-					'format' => [
-						'type' => 'value',
-						'link' => BASEURL . '/editasset/?id={ID_ASSET}',
-						'data' => 'filename',
-					],
+					'link' => BASEURL . '/editasset/?id={ID_ASSET}',
+					'value' => 'filename',
 				],
 				'id_user_uploaded' => [
 					'header' => 'User uploaded',
 					'is_sortable' => true,
-					'format' => [
-						'type' => 'function',
-						'data' => function($row) {
-							if (!empty($row['id_user']))
-								return sprintf('<a href="%s/edituser/?id=%d">%s</a>', BASEURL, $row['id_user'],
-									$row['first_name'] . ' ' . $row['surname']);
-							else
-								return 'n/a';
-						},
-					],
+					'format' => function($row) {
+						if (!empty($row['id_user']))
+							return sprintf('<a href="%s/edituser/?id=%d">%s</a>', BASEURL, $row['id_user'],
+								$row['first_name'] . ' ' . $row['surname']);
+						else
+							return 'n/a';
+					},
 				],
 				'dimensions' => [
 					'header' => 'Dimensions',
 					'is_sortable' => false,
-					'format' => [
-						'type' => 'function',
-						'data' => function($row) {
-							if (!empty($row['image_width']))
-								return $row['image_width'] . ' x ' . $row['image_height'];
-							else
-								return 'n/a';
-						},
-					],
+					'format' => function($row) {
+						if (!empty($row['image_width']))
+							return $row['image_width'] . ' x ' . $row['image_height'];
+						else
+							return 'n/a';
+					},
 				],
 			],
 			'default_sort_order' => 'id_asset',
diff --git a/controllers/ManageErrors.php b/controllers/ManageErrors.php
index 1496617..cdb75dc 100644
--- a/controllers/ManageErrors.php
+++ b/controllers/ManageErrors.php
@@ -45,20 +45,17 @@ class ManageErrors extends HTMLController
 					'is_sortable' => true,
 				],
 				'message' => [
-					'format' => [
-						'type' => 'function',
-						'data' => function($row) {
-							return $row['message'] . '<br>' .
-								'<div><a onclick="this.parentNode.childNodes[1].style.display=\'block\';this.style.display=\'none\';">Show debug info</a>' .
-								'<pre style="display: none">' . htmlspecialchars($row['debug_info']) .
-								'</pre></div>' .
-								'<small><a href="' . BASEURL .
-									htmlspecialchars($row['request_uri']) . '">' .
-									htmlspecialchars($row['request_uri']) . '</a></small>';
-						}
-					],
 					'header' => 'Message / URL',
 					'is_sortable' => false,
+					'format' => function($row) {
+						return $row['message'] . '<br>' .
+							'<div><a onclick="this.parentNode.childNodes[1].style.display=\'block\';this.style.display=\'none\';">Show debug info</a>' .
+							'<pre style="display: none">' . htmlspecialchars($row['debug_info']) .
+							'</pre></div>' .
+							'<small><a href="' . BASEURL .
+								htmlspecialchars($row['request_uri']) . '">' .
+								htmlspecialchars($row['request_uri']) . '</a></small>';
+					},
 				],
 				'file' => [
 					'value' => 'file',
@@ -89,10 +86,8 @@ class ManageErrors extends HTMLController
 				'uid' => [
 					'header' => 'UID',
 					'is_sortable' => true,
-					'format' => [
-						'link' => BASEURL . '/edituser/?id={ID_USER}',
-						'data' => 'id_user',
-					],
+					'link' => BASEURL . '/edituser/?id={ID_USER}',
+					'value' => 'id_user',
 				],
 			],
 			'default_sort_order' => 'id_entry',
diff --git a/controllers/ManageTags.php b/controllers/ManageTags.php
index 400d9b1..9dc653b 100644
--- a/controllers/ManageTags.php
+++ b/controllers/ManageTags.php
@@ -37,32 +37,25 @@ class ManageTags extends HTMLController
 				'tag' => [
 					'header' => 'Tag',
 					'is_sortable' => true,
-					'format' => [
-						'link' => BASEURL . '/edittag/?id={ID_TAG}',
-						'data' => 'tag',
-					],
+					'link' => BASEURL . '/edittag/?id={ID_TAG}',
+					'value' => 'tag',
 				],
 				'slug' => [
 					'header' => 'Slug',
 					'is_sortable' => true,
-					'format' => [
-						'link' => BASEURL . '/edittag/?id={ID_TAG}',
-						'data' => 'slug',
-					],
+					'link' => BASEURL . '/edittag/?id={ID_TAG}',
+					'value' => 'slug',
 				],
 				'id_user_owner' => [
 					'header' => 'Owning user',
 					'is_sortable' => true,
-					'format' => [
-						'type' => 'function',
-						'data' => function($row) {
-							if (!empty($row['id_user']))
-								return sprintf('<a href="%s/edituser/?id=%d">%s</a>', BASEURL, $row['id_user'],
-									$row['first_name'] . ' ' . $row['surname']);
-							else
-								return 'n/a';
-						},
-					],
+					'format' => function($row) {
+						if (!empty($row['id_user']))
+							return sprintf('<a href="%s/edituser/?id=%d">%s</a>', BASEURL, $row['id_user'],
+								$row['first_name'] . ' ' . $row['surname']);
+						else
+							return 'n/a';
+					},
 				],
 				'count' => [
 					'header' => 'Cardinality',
diff --git a/controllers/ManageUsers.php b/controllers/ManageUsers.php
index 068a996..5e66946 100644
--- a/controllers/ManageUsers.php
+++ b/controllers/ManageUsers.php
@@ -37,26 +37,20 @@ class ManageUsers extends HTMLController
 				'surname' => [
 					'header' => 'Last name',
 					'is_sortable' => true,
-					'format' => [
-						'link' => BASEURL . '/edituser/?id={ID_USER}',
-						'data' => 'surname',
-					],
+					'link' => BASEURL . '/edituser/?id={ID_USER}',
+					'value' => 'surname',
 				],
 				'first_name' => [
 					'header' => 'First name',
 					'is_sortable' => true,
-					'format' => [
-						'link' => BASEURL . '/edituser/?id={ID_USER}',
-						'data' => 'first_name',
-					],
+					'link' => BASEURL . '/edituser/?id={ID_USER}',
+					'value' => 'first_name',
 				],
 				'slug' => [
 					'header' => 'Slug',
 					'is_sortable' => true,
-					'format' => [
-						'link' => BASEURL . '/edituser/?id={ID_USER}',
-						'data' => 'slug',
-					],
+					'link' => BASEURL . '/edituser/?id={ID_USER}',
+					'value' => 'slug',
 				],
 				'emailaddress' => [
 					'value' => 'emailaddress',
@@ -82,12 +76,7 @@ class ManageUsers extends HTMLController
 				'is_admin' => [
 					'is_sortable' => true,
 					'header' => 'Admin?',
-					'format' => [
-						'type' => 'function',
-						'data' => function($row) {
-							return $row['is_admin'] ? 'yes' : 'no';
-						}
-					],
+					'format' => fn($row) => $row['is_admin'] ? 'yes' : 'no',
 				],
 			],
 			'default_sort_order' => 'id_user',
diff --git a/models/GenericTable.php b/models/GenericTable.php
index f564d29..50cf258 100644
--- a/models/GenericTable.php
+++ b/models/GenericTable.php
@@ -192,7 +192,9 @@ class GenericTable
 			foreach ($options['columns'] as $column)
 			{
 				// Process formatting
-				if (isset($column['format']))
+				if (isset($column['format']) && is_callable($column['format']))
+					$value = $column['format']($row);
+				elseif (isset($column['format']))
 					$value = self::processFormatting($column['format'], $row);
 				else
 					$value = $row[$column['value']];