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Description

Creates a 'sizes' attribute value for an image.

Usage

$string|false = wp_calculate_image_sizes( $size, $image_src, $image_meta, $attachment_id );

Parameters

$size

( string|int[] ) required – Image size. Accepts any registered image size name, or an array of width and height values in pixels (in that order).

$image_src

( string ) optional – Optional. The URL to the image file. Default null.

$image_meta

( array ) optional – Optional. The image meta data as returned by 'wp_get_attachment_metadata()'. Default null.

$attachment_id

( int ) optional – Optional. Image attachment ID. Either $image_meta or $attachment_id is needed when using the image size name as argument for `$size`. Default 0.

Returns

string|false A valid source size value for use in a 'sizes' attribute or false.

Source

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

function wp_calculate_image_sizes( $size, $image_src = null, $image_meta = null, $attachment_id = 0 ) {
  $width = 0;

  if ( is_array( $size ) ) {
    $width = absint( $size[0] );
  } elseif ( is_string( $size ) ) {
    if ( ! $image_meta && $attachment_id ) {
      $image_meta = wp_get_attachment_metadata( $attachment_id );
    }

    if ( is_array( $image_meta ) ) {
      $size_array = _wp_get_image_size_from_meta( $size, $image_meta );
      if ( $size_array ) {
        $width = absint( $size_array[0] );
      }
    }
  }

  if ( ! $width ) {
    return false;
  }

  // Setup the default 'sizes' attribute.
  $sizes = sprintf( '(max-width: %1$dpx) 100vw, %1$dpx', $width );

  
/**
 * Filters the output of 'wp_calculate_image_sizes()'.
 *
 * @since 4.4.0
 *
 * @param string       $sizes         A source size value for use in a 'sizes' attribute.
 * @param string|int[] $size          Requested image size. Can be any registered image size name, or
 *                                    an array of width and height values in pixels (in that order).
 * @param string|null  $image_src     The URL to the image file or null.
 * @param array|null   $image_meta    The image meta data as returned by wp_get_attachment_metadata() or null.
 * @param int          $attachment_id Image attachment ID of the original image or 0.
 */
  return apply_filters( 'wp_calculate_image_sizes', $sizes, $size, $image_src, $image_meta, $attachment_id );
}
 

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