WordPress Developer Resources

apply_filters( ‘get_image_tag_class’, string $class, int $id, string $align, string|int[] $size )

Filters the value of the attachment’s image tag class attribute.

Parameters

$classstring: CSS class name or space-separated list of classes.
$idint: Attachment ID.
$alignstring: Part of the class name for aligning the image.
$sizestring|int[]: Requested image size. Can be any registered image size name, or an array of width and height values in pixels (in that order).

Source

$class = apply_filters( 'get_image_tag_class', $class, $id, $align, $size );

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Changelog

Version	Description
2.6.0	Introduced.

User Contributed Notes

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Emil 6 years ago

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To add the .img-fluid class, for responsive images in Bootstrap 4:
```
function example_add_img_class( $class ) {
	
	return $class . ' img-fluid';
	
}

add_filter( 'get_image_tag_class', 'example_add_img_class' );
```
- It will not work for the_post_thumbnail() ; It will work only for what you have in wysiwyg editor
  
  Kris Kelvin 4 years ago
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