The real workhorses behind wp_get_attachment_image_src are image_downsize & image_get_intermediate_size.
Between the two, they’ll attempt to find the largest image available that fits within the constraints of the required size.
The return value of wp_get_attachment_image_src will be:
1 2 3 4 5 | Array( [0] => 'source of image that best fits', [1] => 'width of source image' [2] => 'height of source image', ) |
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