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
Descripción
bool readline_callback_handler_install
( string $prompt
, callback $callback
)
Sets up a readline callback interface then prints prompt and immediately returns. Calling this function twice without removing the previous callback interface will automatically and conveniently overwrite the old interface.
The callback feature is useful when combined with stream_select() as it allows interleaving of IO and user input, unlike readline().
Lista de parámetros
- prompt
-
The prompt message.
- callback
-
The callback function takes one parameter; the user input returned.
Valores retornados
Devuelve TRUE si todo se llevó a cabo correctamente, FALSE en caso de fallo.
Ejemplos
Example#1 Readline Callback Interface Example
<?php
function rl_callback($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";
?>