(PHP 5 >= 5.1.0, PHP 7)
Initializes the readline callback interface and terminal, prints the prompt and returns immediately
bool readline_callback_handler_install ( string $prompt, callable $callback )
Sets up a readline callback interface then prints prompt
and immediately returns. Calling this function twice without removing the previous callback interface will automatically and conveniently overwrite the old interface.
The callback feature is useful when combined with stream_select() as it allows interleaving of IO and user input, unlike readline().
Parameters:
prompt
The prompt message.
callback
The callback
function takes one parameter; the user input returned.
Returns:
Returns TRUE
on success or FALSE
on failure.
Examples:
Readline Callback Interface Example
<?php function rl_callback($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() -
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