Resource Types
Unicode Functions
Unicode
PHP Manual

# Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

constant | value | description
--- | --- | ---
U_INVALID_STOP | 0 | stop at first invalid character
U_INVALID_SKIP | 1 | skip invalid characters
U_INVALID_SUBSTITUTE | 2 | replace invalid characters
U_INVALID_ESCAPE | 3 | escape invalid characters

Resource Types
Unicode Functions
Unicode
PHP Manual