FieldtypeURL

string — a valid URL, or empty string '' when blank.

// Get
$page->url_field   // string, e.g. "https://example.com/path/"

// Set
$page->url_field = 'https://example.com/path/';
$page->url_field = '/local/path/';  // relative URL (if allowed by field setting)
$page->url_field = '';  // clear
$page->save('url_field');

Values are sanitized through $sanitizer->url() — dangerous URL schemes (e.g. javascript:) are stripped to blank, but arbitrary non-URL strings are passed through as-is. Validate URL format separately if your use case requires it.

$pages->find('url_field=""');           // no URL
$pages->find('url_field^=https://');    // starts with
$pages->find('url_field*=example.com'); // contains

// With TextformatterEntities applied and output formatting ON:
echo '<a href="' . $page->url_field . '">Link</a>';

If the addRoot field setting is enabled, relative URLs (starting with /) are automatically prepended with the site's root path when output formatting is on.

• noRelative=1 disables relative/local URLs; only full protocol URLs are accepted.
• allowIDN=1 permits internationalized domain names.
• allowQuotes=1 allows quote characters in URLs (always entity-encode output when used).
• addRoot=1 prepends the site's root path to relative URLs during output formatting — useful for subdirectory installs.
• Strongly recommended: apply TextformatterEntities to any URL field used in HTML output.
• Database column: text NOT NULL (inherits from FieldtypeText).
• Compatible fieldtypes: any fieldtype extending FieldtypeText.