[edit] Last updated: Fri, 23 Mar 2012

readline_callback_handler_install

(PHP 5 >= 5.1.0)

readline_callback_handler_install — Initializes the readline callback interface and terminal, prints the prompt and returns immediately

Opis

bool readline_callback_handler_install ( string $prompt , callable $callback )

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().

Parametry

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

Zwracane wartości

Zwraca TRUE w przypadku powodzenia, FALSE w przypadku błędu.

Przykłady

Przykład #1 Readline Callback Interface Example


<?php
function rl_callback($ret)
{
    global $c, $prompting;

    echo "You entered: $ret\n";
    $c++;

    if ($c > 10) {
        $prompting = false;
        readline_callback_handler_remove();
    } else {
        readline_callback_handler_install("[$c] Enter something: ", 'rl_callback');
    }
}

$c = 1;
$prompting = true;

readline_callback_handler_install("[$c] Enter something: ", 'rl_callback');

while ($prompting) {
    $w = NULL;
    $e = NULL;
    $n = stream_select($r = array(STDIN), $w, $e, null);
    if ($n && in_array(STDIN, $r)) {
        // read a character, will call the callback when a newline is entered
        readline_callback_read_char();
    }
}

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

Zobacz też:

readline_callback_handler_remove() - Removes a previously installed callback handler and restores terminal settings
readline_callback_read_char() - Reads a character and informs the readline callback interface when a line is received
stream_select() - Runs the equivalent of the select() system call on the given arrays of streams with a timeout specified by tv_sec and tv_usec

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