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
Description
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().
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";
?>
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