How to Set Custom Limit on Checkout Phone field in WooCommerce | Contain 10 Numbers - Validation 

In this woocommerce tutorial for beginners you will learn how to set specific number limit in phone field using custom php snippet in checkout page in wordpress website. So you can validate telephone field according to your requirement, so you can set 10, 15 or 20.
* Use Below Custom Code to Set Limit:
// You can add a custom placeholder to add a hint for your CUs what you expect
add_filter( 'woocommerce_checkout_fields' , 'custom_override_checkout_fields2' );
// Our hooked in function - $fields is passed via the filter!
function custom_override_checkout_fields2( $fields ) {
$fields['billing']['billing_phone']['placeholder'] = '09XXXXXXXXX';
return $fields;
}
/****************************************************************/
/* VALIDATION FOR PHONE FIELD THIS WILL THROW AN ERROR MESSAGE */
/****************************************************************/
/** Process the checkout **/
add_action('woocommerce_checkout_process', 'my_custom_checkout_field_process');
function my_custom_checkout_field_process() {
global $woocommerce;
// Check if set, if its not set add an error. This one is only requite for companies
if ( ! (preg_match('/^[0-9]{10}$/D', $_POST['billing_phone'] ))){
wc_add_notice( "The Phone should contain only 10 digits" ,'error' );
}
}
* In code you see {10} so if you want to change limit then add your digit / number instead of 10 in code.
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