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readline_callback_handler_install

(PHP 5 >= 5.1.0, PHP 7)

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

Descrição

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().

Parâmetros

prompt

The prompt message.

callback

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

Valor Retornado

Retorna TRUE em caso de sucesso ou FALSE em caso de falha.

Exemplos

Exemplo #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), $w$enull);
    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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thflori
1 year 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;
}
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