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Description

Get an HTML img element representing an image attachment

While $size will accept an array, it is better to register a size with add_image_size() so that a cropped version is generated. It's much more efficient than having to find the closest-sized image and then having the browser scale down the image.

Usage

$string = wp_get_attachment_image( $attachment_id, $size, $icon, $attr );

Parameters

$attachment_id

( int ) required – Image attachment ID.

$size

( string|array ) optional default: thumbnail – Optional. Image size. Accepts any valid image size, or an array of width and height values in pixels (in that order). Default 'thumbnail'.

$icon

( bool ) optional – Optional. Whether the image should be treated as an icon. Default false.

$attr

( string|array ) optional – Optional. Attributes for the image markup. Default empty.

Returns

string HTML img element or empty string on failure.

Source

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

function wp_get_attachment_image( $attachment_id, $size = 'thumbnail', $icon = false, $attr = '' ) {
  $html  = '';
  $image = wp_get_attachment_image_src( $attachment_id, $size, $icon );
  if ( $image ) {
    list($src, $width, $height) = $image;
    $hwstring                   = image_hwstring( $width, $height );
    $size_class                 = $size;
    if ( is_array( $size_class ) ) {
      $size_class = join( 'x', $size_class );
    }
    $attachment   = get_post( $attachment_id );
    $default_attr = array(
      'src'   => $src,
      'class' => "attachment-$size_class size-$size_class",
      'alt'   => trim( strip_tags( get_post_meta( $attachment_id, '_wp_attachment_image_alt', true ) ) ),
    );

    $attr = wp_parse_args( $attr, $default_attr );

    // Generate 'srcset' and 'sizes' if not already present.
    if ( empty( $attr['srcset'] ) ) {
      $image_meta = wp_get_attachment_metadata( $attachment_id );

      if ( is_array( $image_meta ) ) {
        $size_array = array( absint( $width ), absint( $height ) );
        $srcset     = wp_calculate_image_srcset( $size_array, $src, $image_meta, $attachment_id );
        $sizes      = wp_calculate_image_sizes( $size_array, $src, $image_meta, $attachment_id );

        if ( $srcset && ( $sizes || ! empty( $attr['sizes'] ) ) ) {
          $attr['srcset'] = $srcset;

          if ( empty( $attr['sizes'] ) ) {
            $attr['sizes'] = $sizes;
          }
        }
      }
    }

    
/**
 * Filters the list of attachment image attributes.
 *
 * @since 2.8.0
 *
 * @param array        $attr       Attributes for the image markup.
 * @param WP_Post      $attachment Image attachment post.
 * @param string|array $size       Requested size. Image size or array of width and height values
 *                                 (in that order). Default 'thumbnail'.
 */
    $attr = apply_filters( 'wp_get_attachment_image_attributes', $attr, $attachment, $size );
    $attr = array_map( 'esc_attr', $attr );
    $html = rtrim( "<img $hwstring" );
    foreach ( $attr as $name => $value ) {
      $html .= " $name=" . '"' . $value . '"';
    }
    $html .= ' />';
  }

  return $html;
}
 

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