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readline_callback_handler_install
Manuál PHP
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readline_callback_handler_install

(PHP 5 >= 5.1.0RC1)

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

Popis

bool readline_callback_handler_install ( string prompt, callback 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().

Seznam parametrů

prompt

The prompt message.

callback

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

Návratové hodnoty

Vrací TRUE při úspěchu, FALSE při selhání.

Příklady

Příklad 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";
?>

Viz také

readline_callback_handler_remove()
readline_callback_read_char()
stream_select()

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