readline_callback_handler_install
(PHP 5 >= 5.1.0, PHP 7, PHP 8)
readline_callback_handler_install — 初始化 readline 回调接口和终端，然后打印提示并立即返回
说明
设置 readline 回调接口然后打印 prompt
并立即返回。在不移除旧的回调接口的情况下再次调用此函数，将自动覆盖旧接口。
与 stream_select() 结合使用时，回调功能很有用，因为允许 IO 和用户输入交互，这与 readline() 不同。
参数
prompt-
提示信息。
callback-
callback函数接受一个参数；返回用户输入。
返回值
总是返回 true。
示例
示例 #1 Readline 回调接口示例
<?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";
?>参见
- readline_callback_handler_remove() - 移除之前已安装的回调函数句柄并且恢复终端设置
- readline_callback_read_char() - 当一个行被接收时读取一个字符并且通知 readline 回调接口
- stream_select() - Runs the equivalent of the select() system call on the given arrays of streams with a timeout specified by seconds and microseconds
＋添加备注
用户贡献的备注 1 note
thflori ¶
6 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;
}备份地址：http://www.lvesu.com/blog/php/function.readline-callback-handler-install.php