Custom Avatar via Advanced Custom Fields Image Upload and Front End Profile Image Upload

functions.php

<?php
// Custom Avatar via Advanced Custom Fields Image Upload
add_filter( 'get_avatar' , 'gofas_custom_avatar', 1, 5 );
function gofas_custom_avatar( $avatar, $id_or_email, $size, $default, $alt ) {
	$image_object = get_field('your_image_field_id', 'user_'.$id_or_email);
	$image_size = 'thumbnail';
	$acf_avatar = $image_object['sizes'][$image_size]; // Configure ACF Image to return Image Object
  	if ( $image_object ) {
    $avatar = $acf_avatar; // ACF Avatar
    $avatar = "<img alt='{$alt}' src='{$avatar}' class='avatar avatar-{$size} photo' height='{$size}' width='{$size}' />";
	}
    return $avatar;
}
// End Custom Avatar via Advanced Custom Fields Image Upload

page.php

<?php
// Form Upload in front end for Custom Avatar via Advanced Custom Fields Image Upload
	$user_ID = get_current_user_id();
	$post_id = 'user_' . $user_ID; // Define Form target to Current User
	acf_form(array(	
		'field_groups' => array( 532 ), // ID For the Group Of Fields
		'fields' => 'your_image_field_id',
		'submit_value' => __("Update Image", 'acf'),
		'updated_message' => __("Image updated", 'acf'),
		'post_id' => $post_id,
	));
	// Form Upload in front end for Custom Avatar via Advanced Custom Fields Image Upload
?>