CakeFest 2024: The Official CakePHP Conference

readline_callback_handler_install

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

readline_callback_handler_installInitializes the readline callback interface and terminal, prints the prompt and returns immediately

Descrizione

readline_callback_handler_install(string $prompt, callable $callback): bool

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().

Elenco dei parametri

prompt

The prompt message.

callback

The callback function takes one parameter; the user input returned.

Valori restituiti

Restituisce true in caso di successo, false in caso di fallimento.

Esempi

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";
?>

Vedere anche:

add a note

User Contributed Notes 1 note

up
1
thflori
5 years ago
To read byte wise and multi line you can check the line_buffer from readline_info:

<?php

function read(int $count, string $prompt = null): string
{
$previous = '';
readline_callback_handler_install($prompt ?? " \e[D", function ($str) use (&$previous) {
$previous .= $str . PHP_EOL;
});
do {
$r = array(STDIN);
$n = stream_select($r, $w, $e, null);
if (
$n && in_array(STDIN, $r)) {
readline_callback_read_char();
$str = $previous . readline_info('line_buffer');
}
} while (
mb_strlen($str) < $count); // use strlen if you need the exact byte count
readline_callback_handler_remove();

return
$str;
}
To Top