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Woocommerce overwriting Shipping City Select Field

Solution:

This should work with woocommerce_form_field_args hook, this way:

add_filter( 'woocommerce_form_field_args', 'custom_form_field_args', 10, 3 );
function custom_form_field_args( $args, $key, $value ) { 
    if ( $args['id'] == 'billing_city' ) {
     $args = array(
            'label' => __( 'Suburb/City', 'woocommerce' ),
            'required' => FALSE,
            'clear' => TRUE,
            'type' => 'select',
            'options' => $options_array,
            'class' => array( 'update_totals_on_change' )
        );
    } // elseif … and go on 

    return $args;
};

This are he default $args parameter values:

$defaults = array(
    'type'              => 'text',
    'label'             => '',
    'description'       => '',
    'placeholder'       => '',
    'maxlength'         => false,
    'required'          => false,
    'autocomplete'      => false,
    'id'                => $key,
    'class'             => array(),
    'label_class'       => array(),
    'input_class'       => array(),
    'return'            => false,
    'options'           => array(),
    'custom_attributes' => array(),
    'validate'          => array(),
    'default'           => '',
);

References: