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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


Unicode
PHP Manual