Scenario: You 'only' have 'url' of first image occurring in your 'the_content' and you want to find that image's width/height. Code goes in functions.php

find_first_image_width.php

<?php

/*
Here we will find out the WIDTH of 'first' image occuring in our 'the_content'
*/

/*
Step: 1
Using the famous 'catch_that_image' snippet, we will fetch the url of first image
occuring in the content and will pass the same url while calling a function to find
it's WIDTH.
*/

add_action('genesis_entry_header','image_above_t',7); //to place image above title
 
function image_above_t() {
  global $post;
  $first_img = '';
  ob_start();
  ob_end_clean();
  $output = preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $post->post_content, $matches);
  $first_img = $matches[1][0]; //path of first image occurring in the_content
  
  $img_width = custom_get_img_width($first_img); //pass the path of first image to function which will return image's width
  
  /*
  Here will be the putting code which uses $img_width in some manner that we want.
  */
}

/*
Step 2:
This function will determine the WIDTH of our image
Thanks to - @philipnewcomer
*/

function custom_get_img_width($first_img) {
  
	global $wpdb;
	  
	$attachment_url = $first_img; //attachment(image) url

	$upload_dir_paths = wp_upload_dir(); // Get the upload directory paths
 
	// Make sure the upload path base directory exists in the attachment URL, to verify that we're working with a media library image
	if ( false !== strpos( $attachment_url, $upload_dir_paths['baseurl'] ) ) {
 
		// If this is the URL of an auto-generated thumbnail, get the URL of the original image
		$attachment_url = preg_replace( '/-\d+x\d+(?=\.(jpg|jpeg|png|gif)$)/i', '', $attachment_url );
 
		// Remove the upload path base directory from the attachment URL
		$attachment_url = str_replace( $upload_dir_paths['baseurl'] . '/', '', $attachment_url );
 
		// Finally, run a custom database query to get the attachment ID from the modified attachment URL
		$attachment_id = $wpdb->get_var( $wpdb->prepare( "SELECT wposts.ID FROM $wpdb->posts wposts, $wpdb->postmeta wpostmeta WHERE wposts.ID = wpostmeta.post_id AND wpostmeta.meta_key = '_wp_attached_file' AND wpostmeta.meta_value = '%s' AND wposts.post_type = 'attachment'", $attachment_url ) ); // to get attachment(image) id
 
	}
	
	$image_attributes = wp_get_attachment_image_src( $attachment_id, 'full' ); // returns an array of attachment(image) attributes
	
	$img_width= $image_attributes[1]; //finally the width of image
	
	return $img_width;
}

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