Setting minimum and maximum for quantity input args

cmnq_min_max_quantity.php

<?php
/*
* Setting minimum and maximum for quantity input args. 
*/

function wc_qty_input_args( $args, $product ) {
	
	$product_id = $product->get_parent_id() ? $product->get_parent_id() : $product->get_id();
	
	$product_min = wc_get_product_min_limit( $product_id );
	$product_max = wc_get_product_max_limit( $product_id );	

	if ( ! empty( $product_min ) ) {
		// min is empty
		if ( false !== $product_min ) {
			$args['min_value'] = $product_min;
		}
	}

	if ( ! empty( $product_max ) ) {
		// max is empty
		if ( false !== $product_max ) {
			$args['max_value'] = $product_max;
		}
	}

	if ( $product->managing_stock() && ! $product->backorders_allowed() ) {
		$stock = $product->get_stock_quantity();

		$args['max_value'] = min( $stock, $args['max_value'] );	
	}

	return $args;
}
add_filter( 'woocommerce_quantity_input_args', 'wc_qty_input_args', 10, 2 );

function wc_get_product_max_limit( $product_id ) {
	$qty = get_post_meta( $product_id, '_wc_max_qty_product', true );
	if ( empty( $qty ) ) {
		$limit = false;
	} else {
		$limit = (int) $qty;
	}
	return $limit;
}

function wc_get_product_min_limit( $product_id ) {
	$qty = get_post_meta( $product_id, '_wc_min_qty_product', true );
	if ( empty( $qty ) ) {
		$limit = false;
	} else {
		$limit = (int) $qty;
	}
	return $limit;
}
?>