bool isDefined(string $option)
Returns whether an option is defined.
Returns true for any option passed to {@link setDefault()}, {@link setRequired()} or {@link setDefined()}.
bool isDefined(string $option)
Returns whether an option is defined.
Returns true for any option passed to {@link setDefault()}, {@link setRequired()} or {@link setDefined()}.
| string | $option | The option name |
| bool | Whether the option is defined |
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