[edit] Last updated: Fri, 17 May 2013

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

说明

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().

参数

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

返回值

成功时返回 TRUE，或者在失败时返回 FALSE。

范例

Example #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";
?>

参见

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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