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Description

Handles the process of uploading media.

Usage

$null|string = wp_media_upload_handler();

Parameters

Returns

null|string

Source

File name: wordpress/wp-admin/includes/media.php
Lines:

function wp_media_upload_handler() {
  $errors = array();
  $id     = 0;

  if ( isset( $_POST['html-upload'] ) && ! empty( $_FILES ) ) {
    check_admin_referer( 'media-form' );
    // Upload File button was clicked.
    $id = media_handle_upload( 'async-upload', $_REQUEST['post_id'] );
    unset( $_FILES );

    if ( is_wp_error( $id ) ) {
      $errors['upload_error'] = $id;
      $id                     = false;
    }
  }

  if ( ! empty( $_POST['insertonlybutton'] ) ) {
    $src = $_POST['src'];

    if ( ! empty( $src ) && ! strpos( $src, '://' ) ) {
      $src = "http://$src";
    }

    if ( isset( $_POST['media_type'] ) && 'image' !== $_POST['media_type'] ) {
      $title = esc_html( wp_unslash( $_POST['title'] ) );
      if ( empty( $title ) ) {
        $title = esc_html( wp_basename( $src ) );
      }

      if ( $title && $src ) {
        $html = "<a href='" . esc_url( $src ) . "'>$title</a>";
      }

      $type = 'file';
      $ext  = preg_replace( '/^.+?\.([^.]+)$/', '$1', $src );

      if ( $ext ) {
        $ext_type = wp_ext2type( $ext );
        if ( 'audio' === $ext_type || 'video' === $ext_type ) {
          $type = $ext_type;
        }
      }

      
/**
 * Filters the URL sent to the editor for a specific media type.
 *
 * The dynamic portion of the hook name, `$type`, refers to the type
 * of media being sent.
 *
 * Possible hook names include:
 *
 *  - `audio_send_to_editor_url`
 *  - `file_send_to_editor_url`
 *  - `video_send_to_editor_url`
 *
 * @since 3.3.0
 *
 * @param string $html  HTML markup sent to the editor.
 * @param string $src   Media source URL.
 * @param string $title Media title.
 */
      $html = apply_filters( "{$type}_send_to_editor_url", $html, sanitize_url( $src ), $title );
    } else {
      $align = '';
      $alt   = esc_attr( wp_unslash( $_POST['alt'] ) );

      if ( isset( $_POST['align'] ) ) {
        $align = esc_attr( wp_unslash( $_POST['align'] ) );
        $class = " class='align$align'";
      }

      if ( ! empty( $src ) ) {
        $html = "<img src='" . esc_url( $src ) . "' alt='$alt'$class />";
      }

      
/**
 * Filters the image URL sent to the editor.
 *
 * @since 2.8.0
 *
 * @param string $html  HTML markup sent to the editor for an image.
 * @param string $src   Image source URL.
 * @param string $alt   Image alternate, or alt, text.
 * @param string $align The image alignment. Default 'alignnone'. Possible values include
 *                      'alignleft', 'aligncenter', 'alignright', 'alignnone'.
 */
      $html = apply_filters( 'image_send_to_editor_url', $html, sanitize_url( $src ), $alt, $align );
    }

    return media_send_to_editor( $html );
  }

  if ( isset( $_POST['save'] ) ) {
    $errors['upload_notice'] = __( 'Saved.' );
    wp_enqueue_script( 'admin-gallery' );

    return wp_iframe( 'media_upload_gallery_form', $errors );

  } elseif ( ! empty( $_POST ) ) {
    $return = media_upload_form_handler();
 

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