PHP 5 >= 5.1.0, PHP 7, PHP 8
readline_callback_handler_install - Initializes the readline callback interface and terminal, prints the prompt and returns immediately
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readline_callback_handler_install( string$prompt, callable$callback ): bool

Sets up a readline callback interface then prints prompt and immediately returns. Calling this function twice without removing the previous callback interface will automatically and conveniently overwrite the old interface.

The callback feature is useful when combined with stream_select as it allows interleaving of IO and user input, unlike readline.



The prompt message.


The callback function takes one parameter; the user input returned.

Return Values

Returns true on success or false on failure.

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Example of readline_callback_handler_install

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Function readline_callback_handler_install:

GNU Readline Functions

Most used PHP functions