The ‘pre_user_first_name’ is a WordPress PHP filter that allows you to modify a user’s first name before the user is created or updated.
Usage
To use this filter, you need to add a custom function to your theme’s functions.php file or in a custom plugin file. Then, hook the function to the pre_user_first_name filter. Here’s a code example:
function my_custom_filter_user_first_name( $first_name ) {
// Your custom code here
return $first_name;
}
add_filter( 'pre_user_first_name', 'my_custom_filter_user_first_name' );
Parameters
$first_name(string): The user’s first name.
Examples
Capitalize the first letter of the first name
function capitalize_first_letter( $first_name ) {
return ucfirst( $first_name );
}
add_filter( 'pre_user_first_name', 'capitalize_first_letter' );
In this example, the capitalize_first_letter function is hooked to the pre_user_first_name filter. It uses the ucfirst() function to capitalize the first letter of the first name before saving or updating the user.
Replace spaces with hyphens in the first name
function replace_spaces_with_hyphens( $first_name ) {
return str_replace( ' ', '-', $first_name );
}
add_filter( 'pre_user_first_name', 'replace_spaces_with_hyphens' );
This code snippet replaces any spaces in the first name with hyphens before saving or updating the user.
Append a prefix to the first name
function append_prefix_to_first_name( $first_name ) {
$prefix = 'Mr.';
return $prefix . ' ' . $first_name;
}
add_filter( 'pre_user_first_name', 'append_prefix_to_first_name' );
In this example, the append_prefix_to_first_name function appends a prefix (e.g., ‘Mr.’) to the first name before saving or updating the user.
Remove special characters from the first name
function remove_special_chars_from_first_name( $first_name ) {
return preg_replace( '/[^A-Za-z0-9\-]/', '', $first_name );
}
add_filter( 'pre_user_first_name', 'remove_special_chars_from_first_name' );
This code snippet removes any special characters from the first name before saving or updating the user, leaving only letters, numbers, and hyphens.
Trim extra spaces from the first name
function trim_extra_spaces_from_first_name( $first_name ) {
return trim( $first_name );
}
add_filter( 'pre_user_first_name', 'trim_extra_spaces_from_first_name' );
In this example, the trim_extra_spaces_from_first_name function trims any extra spaces from the beginning and end of the first name before saving or updating the user.