commit 873c4fd166e4e5dac3af7276b10ba14558418c08
Author: Adrian Short <adrian@adrianshort.org>
Date:   Thu Apr 23 16:24:05 2015 +0100

    First commit

diff --git a/metaupdater.php b/metaupdater.php
new file mode 100644
index 0000000..9f0f68a
--- /dev/null
+++ b/metaupdater.php
@@ -0,0 +1,114 @@
+<?php
+/*
+Plugin Name: Meta Updater
+Plugin URI: 
+Description: Bulk insert and update custom fields
+Version: 0.1
+Author: Adrian Short
+Author URI: https://adrianshort.org/
+License: CC0/public domain
+*/
+
+add_action( 'admin_menu', 'as_metaupdater_menu' );
+
+// Add submenu to Tools menu
+function as_metaupdater_menu() {
+  add_submenu_page(
+    'tools.php', // top-level handle
+    'Meta Updater', // page title 
+    'Meta Updater', // submenu title
+    'manage_options', // capabilities
+    'as_metaupdater', // submenu handle
+    'as_metaupdater_page' //function
+  );
+}
+
+function as_metaupdater_page() {
+  if ( ! current_user_can( 'manage_options' ) ) {
+    wp_die("You do not have sufficient permissions to access this page.");
+  }
+  ?>
+  <div class="wrap">
+    <h2>Meta Updater</h2>
+
+  <?php
+  if ( 'POST' == $_SERVER['REQUEST_METHOD'] ) {
+    foreach( explode( PHP_EOL, $_POST['data'] ) as $row ) {
+      $data[] = str_getcsv( $row );
+    }
+    echo "<pre>";
+    print_r( $data );
+    echo "</pre>";
+
+    $header_row = array_shift( $data );
+    $search_field = $header_row[0];
+    $replace_field = $header_row[1];
+
+    print_r( $header_row );
+    print_r( $data );
+
+    echo "Search: $search_field, replace: $replace_field";
+
+    echo "<h3>Results</h3>";
+
+    $success = 0;
+
+    foreach( $data as $row ) {
+
+      $args = array(
+        'meta_key'   => $search_field,
+        'post_type' => 'site'
+      );
+
+      if ( is_string( $row[0] ) ) {
+        $args['meta_value'] = $row[0]; 
+      } elseif ( is_numeric( $row[0] ) ) {
+        $args['meta_value_num'] = $row[0];
+      }
+
+      echo "<p>";
+      print_r( $args );
+
+      $query = new WP_Query( $args );
+
+      if ( $query->have_posts() ) {
+        while ( $query->have_posts() ) {
+          $query->the_post();
+          echo get_the_title();
+
+          if ( $_POST['dry_run'] != '1' ) {
+            echo "Updating meta for real";
+            if ( update_post_meta( get_the_ID(), $replace_field, $row[1] ) ) {
+              $success++;
+            }
+          }
+
+        }
+      } else {
+        echo "No results<br>";
+      }
+
+    }
+
+    echo "<h3>Saved $success terms.</h3>";
+    
+  }
+  ?>
+  </div>
+
+  <form method="POST" action="">
+  <p>
+    Paste in CSV data: column 1 holds the key field and column 2 holds the value. The first row must be a header row. Every post with the field set to the value in column 1 will have a field added or updated with the value in column 2.
+  </p>
+
+  <textarea name="data" rows="15" cols="60">
+openlylocal_id,area_covered
+2192,"All of London"
+2191,"Greater Manchester"
+  </textarea>
+  <p><input type="checkbox" name="dry_run" value="1" checked="checked" /> <label for="dry_run">Dry run - leave the database unchanged</label></p>
+  <p><input class="button-primary" type="submit" value="Update Custom Fields" /></p>
+  </form>
+
+  <?php
+}