ACF number format with classes

ACF_number_format_with_classes.php

<?php

/**
 * return number_formatted fieldvalue by adding classes to number field in Field Group
 *
 * my-currency       : return as formatted number 1999 becomes 1,999
 * my-currency-dec-# : set the number of decimals to return, # is the number of decimals (needs at least one character)
 */

add_filter( 'acf/load_value/type=number', 'my_check_number_classes', 10, 3 );

function my_check_number_classes( $value , $post_id , $field ){
	
	if ( is_admin() ) return $value;

	$re = '/(?:my\-currency\-dec\-)([0-9]{1,})|(?:my-currency)\b/m';
	
	preg_match_all($re, $field['wrapper']['class'], $matches, PREG_SET_ORDER, 0);
	
  // if there are no matches at all return asap
	if (!$matches) return $value;
	
  // set defaults
	$do_number_format = false;
	$decimals = 0;
	
	if (sizeof( $matches ) > 0 ) {
	   foreach ($matches as $match) {
	     switch ( $match[0] ) {
	        case 'my-currency':
	          $do_number_format = true;
	        break;
	        // must be a match for my-currency-dec-#
	        default:
	          $decimals = (integer)$match[1];
	        break;
	     }
	   }
	}

  // if a my-currency class was found return as number_format
	if ( $do_number_format ) return number_format( $value , $decimals , '.' , ',');

  // if after all no my-currency class was found simple return the value
	return $value;

}