apply_filters( 'wp_calculate_image_srcset', array $sources, array $size_array, string $image_src, array $image_meta, int $attachment_id )

Filters an image’s ‘srcset’ sources.



(array) One or more arrays of source data to include in the 'srcset'.

  • 'width'
    • 'url'
      (string) The URL of an image source.
    • 'descriptor'
      (string) The descriptor type used in the image candidate string, either 'w' or 'x'.
    • 'value'
      (int) The source width if paired with a 'w' descriptor, or a pixel density value if paired with an 'x' descriptor.


(array) An array of requested width and height values.

  • (int) The width in pixels.
  • '1'
    (int) The height in pixels.


(string) The 'src' of the image.


(array) The image meta data as returned by 'wp_get_attachment_metadata()'.


(int) Image attachment ID or 0.

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File: wp-includes/media.php

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Version Description
4.4.0 Introduced.

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User Contributed Notes

  1. Skip to note 1 content
    Contributed by axew3
    function abc_custom_image_srcset( $sources, $size_array, $image_src, $image_meta, $attachment_id ){
       $w = get_custom_header()->width;
    // srcset val
          $sources[$w] = array(
                 'url'        => 'myfolder/myimage.jpg',
                 'descriptor' => 'w',
                 'value'      => $w,
             return $sources;
       add_filter( 'wp_calculate_image_srcset', 'abc_custom_image_srcset', 10, 5 );

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