if ( ! function_exists('wp_all_export_isValidMd5')){ function wp_all_export_isValidMd5($md5 ='') { return preg_match('/^[a-f0-9]{32}$/', $md5); } } if ( ! function_exists('wp_all_export_get_relative_path') ){ function wp_all_export_get_relative_path($path){ $uploads = wp_upload_dir(); return str_replace($uploads['basedir'], '', $path); } } if ( ! function_exists('wp_all_export_get_absolute_path') ){ function wp_all_export_get_absolute_path($path){ $uploads = wp_upload_dir(); return ( strpos($path, $uploads['basedir']) === false and ! preg_match('%^https?://%i', $path)) ? $uploads['basedir'] . $path : $path; } } if ( ! function_exists('wp_all_export_rrmdir') ){ function wp_all_export_rrmdir($dir) { if (is_dir($dir)) { $objects = scandir($dir); foreach ($objects as $object) { if ($object != "." && $object != "..") { if (filetype($dir . "/" . $object) == "dir") wp_all_export_rrmdir($dir . "/" . $object); else unlink($dir . "/" . $object); } } reset($objects); rmdir($dir); } } } if ( ! function_exists('pmxe_getExtension')){ function pmxe_getExtension($str) { $i = strrpos($str,"."); if (!$i) return ""; $l = strlen($str) - $i; $ext = substr($str,$i+1,$l); return (strlen($ext) <= 4) ? $ext : ""; } } if ( ! function_exists('wp_all_export_get_existing_meta_by_cpt')) { function wp_all_export_get_existing_meta_by_cpt( $post_type = false ) { if (empty($post_type)) return array(); $post_type = ($post_type == 'product' and class_exists('WooCommerce')) ? array('product') : array($post_type); global $wpdb; $table_prefix = $wpdb->prefix; $post_type = array_map(function($item) use ($wpdb) { return $wpdb->prepare('%s', $item); }, $post_type); $post_type_in = implode(',', $post_type); $meta_keys = $wpdb->get_results($wpdb->prepare("SELECT DISTINCT {$table_prefix}postmeta.meta_key FROM {$table_prefix}postmeta, {$table_prefix}posts WHERE {$table_prefix}postmeta.post_id = {$table_prefix}posts.ID AND {$table_prefix}posts.post_type IN ({$post_type_in}) AND {$table_prefix}postmeta.meta_key NOT LIKE '_edit%' AND {$table_prefix}postmeta.meta_key NOT LIKE '_oembed_%' LIMIT 1000")); $_existing_meta_keys = array(); if ( ! empty($meta_keys)){ $exclude_keys = array('_first_variation_attributes', '_is_first_variation_created'); foreach ($meta_keys as $meta_key) { if ( strpos($meta_key->meta_key, "_tmp") === false && strpos($meta_key->meta_key, "_v_") === false && ! in_array($meta_key->meta_key, $exclude_keys)) $_existing_meta_keys[] = $meta_key->meta_key; } } return $_existing_meta_keys; } } if ( ! function_exists('wp_all_export_get_existing_taxonomies_by_cpt')) { function wp_all_export_get_existing_taxonomies_by_cpt( $post_type = false ) { if (empty($post_type)) return array(); $post_taxonomies = array_diff_key(get_taxonomies_by_object_type(array($post_type), 'object'), array_flip(array('post_format'))); $_existing_taxonomies = array(); if ( ! empty($post_taxonomies)){ foreach ($post_taxonomies as $tx) { if (strpos($tx->name, "pa_") !== 0) $_existing_taxonomies[] = array( 'name' => empty($tx->label) ? $tx->name : $tx->label, 'label' => $tx->name, 'type' => 'cats' ); } } return $_existing_taxonomies; } } if ( ! function_exists('wp_all_export_get_taxonomies')) { function wp_all_export_get_taxonomies() { // get all taxonomies $taxonomies = get_taxonomies(FALSE, 'objects'); $ignore = array('nav_menu', 'link_category'); $r = array(); // populate $r foreach ($taxonomies as $taxonomy) { if (in_array($taxonomy->name, $ignore)) { continue; } if ( ! empty($taxonomy->labels->name) && strpos($taxonomy->labels->name, "_") === false){ $r[$taxonomy->name] = $taxonomy->labels->name; } else{ $r[$taxonomy->name] = empty($taxonomy->labels->singular_name) ? $taxonomy->name : $taxonomy->labels->singular_name; } } asort($r, SORT_FLAG_CASE | SORT_STRING); // return return $r; } } if ( ! function_exists('wp_all_export_cmp_custom_types')){ function wp_all_export_cmp_custom_types($a, $b) { return strcmp($a->labels->name, $b->labels->name); } } if ( ! function_exists('prepare_date_field_value')){ function prepare_date_field_value($fieldOptions, $timestamp, $defaultFormat = false){ if ( ! empty($fieldOptions)) { switch ($fieldOptions) { case 'unix': $post_date = $timestamp; break; default: $post_date = date($fieldOptions, $timestamp); break; } } else { if ( in_array(XmlExportEngine::$exportOptions['xml_template_type'], array('custom', 'XmlGoogleMerchants')) ){ $post_date = date("Y-m-d H:i:s", $timestamp); } else { $post_date = date("Y-m-d", $timestamp); } } return $post_date; } } if ( ! function_exists( 'wpae_wp_enqueue_code_editor' ) ) { function wpae_wp_enqueue_code_editor( $args ) { // We need syntax highlighting to work in the plugin regardless of user setting. // Function matches https://developer.wordpress.org/reference/functions/wp_enqueue_code_editor/ otherwise. /*if ( is_user_logged_in() && 'false' === wp_get_current_user()->syntax_highlighting ) { return false; }*/ $settings = wp_get_code_editor_settings( $args ); if ( empty( $settings ) || empty( $settings['codemirror'] ) ) { return false; } wp_enqueue_script( 'code-editor' ); wp_enqueue_style( 'code-editor' ); if ( isset( $settings['codemirror']['mode'] ) ) { $mode = $settings['codemirror']['mode']; if ( is_string( $mode ) ) { $mode = array( 'name' => $mode, ); } if ( ! empty( $settings['codemirror']['lint'] ) ) { switch ( $mode['name'] ) { case 'css': case 'text/css': case 'text/x-scss': case 'text/x-less': wp_enqueue_script( 'csslint' ); break; case 'htmlmixed': case 'text/html': case 'php': case 'application/x-httpd-php': case 'text/x-php': wp_enqueue_script( 'htmlhint' ); wp_enqueue_script( 'csslint' ); wp_enqueue_script( 'jshint' ); if ( ! current_user_can( 'unfiltered_html' ) ) { wp_enqueue_script( 'htmlhint-kses' ); } break; case 'javascript': case 'application/ecmascript': case 'application/json': case 'application/javascript': case 'application/ld+json': case 'text/typescript': case 'application/typescript': wp_enqueue_script( 'jshint' ); wp_enqueue_script( 'jsonlint' ); break; } } } wp_add_inline_script( 'code-editor', sprintf( 'jQuery.extend( wp.codeEditor.defaultSettings, %s );', wp_json_encode( $settings ) ) ); /** * Fires when scripts and styles are enqueued for the code editor. * * @param array $settings Settings for the enqueued code editor. * * @since 4.9.0 * */ do_action( 'wp_enqueue_code_editor', $settings ); return $settings; } } Kathy Joseph, Author at Kathy Loves Physics

Kathy Joseph

Why Nikola Tesla is So Famous (and Westinghouse is not)

Leave a Comment / History of Science / By

In January of 1912, almost 20 years after the “war of the currents” was over George Westinghouse Jr. was awarded the American Institute of Electrical Engineer’s highest honor, the Edison Award, for “the development of the alternating-current system for light and power.”[1] In his introduction, the influential and delightful scientist Michael Pupin, said how great …

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George Westinghouse: The Unsung Hero of Electricity

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Table of Contents: The Truth about Tesla’s Contract with Westinghouse How Westinghouse Became an Industrialist George Westinghouse Transitions from Gas to Light Westinghouse and the Transformer Westinghouse and the AC Transmission George Westinghouse and Thomas Edison The Truth about Tesla’s Contract with Westinghouse This video is my attempt to correct what I think is an …

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Maxwell’s Equations Explained: Supplement to the History of Maxwell’s Equation

1 Comment / Maxwell's Equations / By

Introduction In this video I am going to explain the dot product, the cross product, the divergence, the curl and how it all works for Maxwell’s equations AND what Maxwell’s equations mean about magnets and light and a tiny bit about why that is important. But before I do that, I want to take a …

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History of Maxwell’s Equations: #1 Gauss’s Law

2 Comments / Maxwell's Equations / By

I would like to start with a little story. In the late 1950s the faculty of Caltech became concerned that the physics undergraduate curriculum was out of date and wasn’t keeping up with the exciting new developments in Physics, including the discoveries developed by one of their star professors named Richard Feynman. So, as Feynman …

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( ∈ vs. ε): Why Physicists Use 2 Forms of the Greek Letter Epsilon

1 Comment / Michael Faraday / By

When I learned Maxwell’s equations in college, I was taught to draw the permittivity with a Greek letter epsilon that looked like a c with a line in it and not like a backwards 3 like usual.  Table Of Contents Why Physicists Use 2 Forms of the Greek Letter Epsilon Image References Reference Why Physicists …

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history-of-two-phase

How Tesla And Ferraris Invented The Two-Phase Motor

1 Comment / History of Science / By

As I said in my video on the history of 3-phase electricity, both Nikola Tesla and Galileo Ferraris discovered two-phase electricity and the two-phase motor that were, according to Tesla, “identical almost to the smallest detail.” 1 So, how did these two men develop this fantastic discovery? Table of Contents Introduction How Ferraris Got Involved …

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