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 , callback $callback )Sets up a readline callback interface then prints prompt and immediately returns. Calling this function twice without removing the previous callback interface will automatically and conveniently overwrite the old interface.
The callback feature is useful when combined with stream_select() as it allows interleaving of IO and user input, unlike readline().
参数
- prompt
-
The prompt message.
- callback
-
The callback function takes one parameter; the user input returned.
返回值
成功时返回 TRUE， 或者在失败时返回 FALSE.
范例
Example #1 Readline Callback Interface Example
<?php
function rl_callback($ret)
{
global $c, $prompting;
echo "You entered: $ret
";
$c++;
if ($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.
";
?>
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
