The best and simplest way to get input from a user in the CLI with only PHP is to use fgetc() function with the STDIN constant:
<?php
echo 'Are you sure you want to quit? (y/n) ';
$input = fgetc(STDIN);
if ($input == 'y')
{
exit(0);
}
?>
(PHP 4, PHP 5, PHP 7, PHP 8)
fgetc — Obtiene un carácter de un puntero a un archivo
handleEl fichero al que se apunta debe ser válido, y debe apuntar a un fichero abierto por fopen() o fsockopen() (y que todavía no esté cerrado por fclose()).
Devuelve una cadena que contiene un sólo carácter leído desde el archivo apuntado
por handle. Devuelve false sobre EOF.
Esta función puede
devolver el valor booleano false, pero también puede devolver un valor no booleano que se
evalúa como false. Por favor lea la sección sobre Booleanos para más
información. Use el operador
=== para comprobar el valor devuelto por esta
función.
Ejemplo #1 Un ejemplo de fgetc()
<?php
$fp = fopen('archivo.txt', 'r');
if (!$fp) {
echo 'No se pudo abrir archivo.txt';
}
while (false !== ($carácter = fgetc($fp))) {
echo "$carácter\n";
}
?>Nota: Esta función es segura binariamente.
The best and simplest way to get input from a user in the CLI with only PHP is to use fgetc() function with the STDIN constant:
<?php
echo 'Are you sure you want to quit? (y/n) ';
$input = fgetc(STDIN);
if ($input == 'y')
{
exit(0);
}
?>I was using command-line PHP to create an interactive script and wanted the user to enter just one character of input - in response a Yes/No question. Had some trouble finding a way to do so using fgets(), fgetc(), various suggestions using readline(), popen(), etc. Came up with the following that works quite nicely:
$ans = strtolower( trim( `bash -c "read -n 1 -t 10 ANS ; echo \\\$ANS"` ) );To read a single key-press in CLI mode, you can either use ncurses (which will probably require additional modules for PHP) or get nasty with the *nix "/bin/stty" command)
<?php
function stty($options) {
exec($cmd = "/bin/stty $options", $output, $el);
$el AND die("exec($cmd) failed");
return implode(" ", $output);
}
function getchar($echo = false) {
$echo = $echo ? "" : "-echo";
# Get original settings
$stty_settings = preg_replace("#.*; ?#s", "", stty("--all"));
# Set new ones
stty("cbreak $echo");
# Get characters until a PERIOD is typed,
# showing their hexidecimal ordinal values.
printf("> ");
do {
printf("%02x ", ord($c = fgetc(STDIN)));
} while ($c != '.');
# Return settings
stty($stty_settings);
}
getchar();
?>You can't just simple print separated characters of a text which is encoded in multibyte character set like this;
Because fgetc() will break each multibyte character on its every byte. Consider this example:
<?php
$path = 'foo/cyrillic.txt';
$handle = fopen($path, 'rb');
while (FALSE !== ($ch = fgetc($handle))) {
$curs = ftell($hanlde);
print "[$curs:] $ch\n";
}
/* The result will be something like this:
<
[1]: <
[2]: h
[3]: 2
[4]: >
[5]: �
[6]: �
[7]: �
[8]: �
[9]: �
[10]: �
[11]:
[12]: �
[13]: �
[14]: �
[15]: �
[16]: �
*/ ?>
I don't think this is the best, but it can be a workaround:
<?php
$path = 'path/to/your/file.ext';
if (!$handle = fopen($path, 'rb')) {
echo "Can't open ($path) file';
exit;
}
$mbch = ''; // keeps the first byte of 2-byte cyrillic letters
while (FALSE !== ($ch = fgetc($handle))) {
//check for the sign of 2-byte cyrillic letters
if (empty($mbch) && (FALSE !== array_search(ord($ch), Array(208,209,129)))) {
$mbch = $ch; // keep the first byte
continue;
}
$curs = ftell($handle);
print "[$curs]: " . $mbch . $ch . PHP_EOL;
// or print "[$curs]: $mbch$ch\n";
if (!empty($mbch)) $mbch = ''; // erase the byte after using
}
?>