readline_callback_handler_install
Initializes the readline callback interface and terminal, prints the prompt and returns immediately
Description
bool readline_callback_handler_install(string $prompt
, callable $callback
)
The callback feature is useful when combined with
stream_select as it allows interleaving of IO and
user input, unlike readline.
Parameters
-
prompt
-
The prompt message.
-
callback
-
The callback
function takes one parameter; the
user input returned.
Return Values
Returns true
on success or false
on failure.
Examples
Example #1 Readline Callback Interface Example
<?php
function rl_callback($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";
?>
See Also
- readline_callback_handler_remove
- readline_callback_read_char
- stream_select