readline

(PHP 4, PHP 5, PHP 7)

readlineLiest eine Zeile

Beschreibung

string readline ([ string $prompt ] )

Liest eine einzelne Zeile vom Benutzer ein. Sie müssen diese Zeile selbst mittels readline_add_history() zur History hinzufügen.

Parameter-Liste

prompt

Sie können eine Zeichenkette angeben, mit dem Sie den Benutzer zur Eingabe auffordern.

Rückgabewerte

Gibt eine einzelne Zeile des Benutzers zurück. Der Zeile, die Sie erhalten, fehlt das abschließende Zeichen für einen Zeilenvorschub.

Beispiele

Beispiel #1 readline()-Beispiel

<?php
// Drei Kommandos vom Benutzer abfragen
for ($i=0$i 3$i++) {
        
$line readline("Command: ");
        
readline_add_history($line);
}

// History ausgeben
print_r(readline_list_history());

// Variablen ausgeben
print_r(readline_info());
?>

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User Contributed Notes 9 notes

up
18
Anonymous
5 years ago
The readline library is not available on Windows.

<?php
if (PHP_OS == 'WINNT') {
  echo
'$ ';
 
$line = stream_get_line(STDIN, 1024, PHP_EOL);
} else {
 
$line = readline('$ ');
}
?>
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3
soletan at toxa dot de
10 years ago
To haukew at gmail dot com:

readline provides more features than reading a single line of input ... your example misses line editing and history. If you don't need that, use something as simple as this:

function readline( $prompt = '' )
{
    echo $prompt;
    return rtrim( fgets( STDIN ), "\n" );
}
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3
rojaro at gmail dot com
8 years ago
Note that readline() will return boolean "false" when the user presses CTRL+D.
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0
turdsurfer
24 days ago
If your CLI script accepts input from STDIN and you also want it to prompt for a password (e.g. as mysql client does), then readline() won't work for you.
What you need to do is read from the terminal device as shown below.

function readline_terminal($prompt = '') {
    $prompt && print $prompt;
    $terminal_device = '/dev/tty';
    $h = fopen($terminal_device, 'r');
    if ($h === false) {
        #throw new RuntimeException("Failed to open terminal device $terminal_device");
        return false; # probably not running in a terminal.
    }
    $line = rtrim(fgets($h),"\r\n");
    fclose($h);
    return $line;
}
$pass = readline_terminal('Password: ');
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0
sean
7 years ago
I wanted a function that would timeout if readline was waiting too long... this works on php CLI on linux:

<?php

function readline_timeout($sec, $def)
{
    return
trim(shell_exec('bash -c ' .
       
escapeshellarg('phprlto=' .
           
escapeshellarg($def) . ';' .
           
'read -t ' . ((int)$sec) . ' phprlto;' .
           
'echo "$phprlto"')));
}

?>

Just call readline_timeout(5, 'whatever') to either read something from stdin, or timeout in 5 seconds and default to 'whatever'.  I tried just using shell_exec without relying on bash -c, but that didn't work for me, so I had to go the round about way.
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0
taneli at crasman dot fi
8 years ago
If you want to prefill the prompt with something when using readline, this worked for me:

<?php
 
function readline_callback($ret)
  {
    global
$prompt_answer, $prompt_finished;
   
$prompt_answer = $ret;
   
$prompt_finished = TRUE;
   
readline_callback_handler_remove();
  }

 
readline_callback_handler_install('Enter some text> ',
                                   
'readline_callback');

 
$prefill = 'foobar';
  for (
$i = 0; $i < strlen($prefill); $i++)
  {
   
readline_info('pending_input', substr($prefill, $i, 1));
   
readline_callback_read_char();
  }

 
$prompt_finished = FALSE;
 
$prompt_answer = FALSE;
  while (!
$prompt_finished)
   
readline_callback_read_char();
  echo
'You wrote: ' . $prompt_answer . "\n";
?>
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0
christian at gaeking dot de
13 years ago
A workaround if readline is not compiled into php, because for example the command is only needed within an installation routine. It works as follows under Linux:

$f=popen("read; echo \$REPLY","r");
$input=fgets($f,100);
pclose($f);       
echo "Entered: $input\n";
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0
cox at idecnet dot com
15 years ago
In CGI mode be sure to call:

ob_implicit_flush(true);

at the top of your script if you want to be able to output data before and after the prompt.

-- Tomas V.V.Cox
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-1
roddric dot kasen at gmail dot com
1 year ago
<?php

class ConsoleQuestion
{

    function
readline()
    {
        return
rtrim(fgets(STDIN));
    }
}

//Example1
$line = new ConsoleQuestion();
$prompt = "What Is Your Name: ";
echo
$prompt;
$answer = $line->readline();
echo
"You Entered: " . $answer;

//Example2 (comment Ex1 then uncomment Ex2)
/*$prompt = "What Is Your Name: ";
echo $prompt;
$answer =  "You Entered: " . rtrim( fgets( STDIN ));
echo $answer;*/

?>
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