PHP 8.4.0 RC4 available for testing

readline

(PHP 4, PHP 5, PHP 7, PHP 8)

readlineLee una línea

Descripción

readline(string $prompt = null): string

Lee una sola línea del usuario. Debe agregar esta línea al historial utilizando readline_add_history().

Parámetros

mensaje

Puedes especificar un mensaje que se muestra al usuario.

Valores devueltos

Devuelve un único string del usuario. Esta línea retornada tiene el avance de línea al final eliminado.

Ejemplos

Ejemplo #1 Ejemplo de readline()

<?php
//obtener 3 comandos del usuario
for ($i=0; $i < 3; $i++) {
$linea = readline("Comando: ");
readline_add_history($linea);
}

//mostrar historial
print_r(readline_list_history());

//mostrar variables
print_r(readline_info());
?>

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User Contributed Notes 5 notes

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16
Antony Penn
4 years ago
Christian's code works well, but if you want to be able to hide the user input and not echo it to screen, you need to add -s to the read command. The code below is an expanded function that allows an optional prompt and optional hiding of the input:

function read_password($prompt=null, $hide=false)
{
if($prompt) print $prompt;
$s = ($hide) ? '-s' : '';
$f=popen("read $s; echo \$REPLY","r");
$input=fgets($f,100);
pclose($f);
if($hide) print "\n";
return $input;
}
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7
turdsurfer
7 years 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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2
cox at idecnet dot com
22 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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0
Anonymous
7 years ago
a few observations....

I use Cygwin PHP v7 and readline is available. The readline_list_history() function though is not defined.

A prompt with escape sequences are sanitized, so use something like:

<?php
echo("\e[0m\e[34mPromt>\e[0m");
$inp = readline(' ');
?>

I have not fully documented it, but I see that sometimes strings beginning with punctuation characters do not make it into the history with readline_add_history(). They also sometimes clear the prompt string.
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-1
rojaro at gmail dot com
16 years ago
Note that readline() will return boolean "false" when the user presses CTRL+D.
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