How to Install a Readline Callback Handler in PHP and Prompt Instantly
This guide explains the PHP function readline_callback_handler_install, which sets up a readline callback interface, displays a prompt, returns immediately, and details its parameters, automatic overriding behavior, and boolean return values for success or failure.
bool readline_callback_handler_install(string $prompt, callable $callback)The readline_callback_handler_install function initializes a readline callback interface, outputs the provided $prompt to the terminal, and returns control to the script without waiting for user input.
When called a second time, the function automatically replaces any previously installed callback, so there is no need to manually remove the old handler.
Parameters
prompt : The text displayed to the user as a prompt.
callback : A callable that receives one argument—the line entered by the user.
Return Value
On success the function returns TRUE; on failure it returns FALSE.
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