PHP readline_info Function – Get and Set Readline Variables

The readline_info function in PHP allows you to retrieve or set internal readline variables.

When called without arguments, it returns an associative array containing all current readline settings such as done, end, prompt, and others. If one or two arguments are provided, the function sets the specified variable and returns its previous value.

Parameters: varname (string) – the name of the variable to get or set. newvalue (string, optional) – the value to assign to the variable.

Return value:

Without parameters: an array of all readline settings.

With parameters: the original value of the specified variable.

Example usage:

<?php
// get 3 commands from user
for ($i = 0; $i < 3; $i++) {
    $line = readline("Command: ");
    readline_add_history($line);
}
print_r(readline_list_history());
print_r(readline_info());
?>