Predefined Constants

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- Predefined Constants

# 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.

`EXIF_USE_MBSTRING` (int)
  This constant has a value of `1` if the mbstring is enabled, otherwise it has a value of `0`.

The exif_imagetype() lists several related built-in constants.