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readline_callback_handler_install

Description

The readline_callback_handler_install of Readline for PHP initializes the readline callback interface and terminal, prints the prompt and returns immediately.

Syntax

readline_callback_handler_install(
    string $prompt,
    callable $callback
): true

Parameters

prompt

The prompt message.

callback

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

Return

Always returns true.

Examples

1 · prompt callback

<?

function myfunction($input)
{
    echo $input;
}

$prompt = "myprompt";
$callback = "myfunction";

$return = readline_callback_handler_install($prompt, $callback);

var_export($return);

true

2

<?

function myfunction($input)
{
    global $count, $prompting;

    echo "You entered: $input\n";

    if(10 < ++$count)
    {
        $prompting = false;
        readline_callback_handler_remove();
    }
    else
    {
        $prompt = "myprompt";
        $callback = "myfunction";

        readline_callback_handler_install($prompt, $callback);
    }
}

$count = 1;
$prompting = true;

$prompt = "myprompt";
$callback = "myfunction";

readline_callback_handler_install($prompt, $callback);

while($prompting)
{
    $w = NULL;
    $e = NULL;
    $n = stream_select($r = array(STDIN), $w, $e, null);
    if($n && in_array(STDIN, $r))
    {
        readline_callback_read_char();
    }
}

echo "Prompting disabled. All done.\n";