PHP 7.0.6 Released

    Readline Functions

    Table of Contents

    User Contributed Notes

    david at acz dot org
    9 years ago
    Readline only reads the window size on startup or on SIGWINCH.  This means if the window is resized when not in a readline() call, the next call will have odd behavior due to confusion about the window size.

    The work-around is to force Readline to re-read the window size by sending it SIGWINCH.  This is accomplished using the async interface, which installs the signal handler but returns control to PHP.

    The following function is a drop-in replacement for readline(), but re-reads the window size every time:

    <?
        function xreadline($prompt)
        {
            global $xreadline, $xreadline_line;
            $code = '$GLOBALS["xreadline"] = false;' .
                    '$GLOBALS["xreadline_line"] = $line;' .
                    'readline_callback_handler_remove();';
            $cb = create_function('$line', $code);
            readline_callback_handler_install($prompt, $cb);
            $signal = defined("SIGWINCH") ? SIGWINCH : 28;
            posix_kill(posix_getpid(), $signal);
            $xreadline = true;
            while ($xreadline)
                readline_callback_read_char();
            return is_null($xreadline_line) ? false : $xreadline_line;
        }
    ?>
    Anonymous
    14 years ago
    [Ed. note: you can use fopen("php://stdin", "w") to achieve the same thing, works on both Windows and Unix)]

    I wanted to get console input in a PHP script running on windows, so I made a little hack, which is so simple, it is clearly public domain.  What I did was write a C++ program to get a line, then output it.  Then all that is needed is to exec() that program and capture the output - readline() for windows.  The C++ source is as follows:

    #include <iostream.h>
    #include <string>
    void main()
    {
        string input;
        cin >> input;
        cout << input;
    }

    It works wonderfully for my purposes, since I love the PHP language and want to have console input.

    Justin Henck
    jeffrey at thompsonic dot com
    11 years ago
    Here's an easy way without readline() if you don't have it compiled in already:

       $fp = fopen("php://stdin","r");
       $line = rtrim(fgets($fp, 1024);
    flobee
    10 years ago
    re to: ds at NOSPAM dot undesigned dot org dot za

    cool program! note when trying to exec() something:
    in the while loop you need to reset exec() returns or you will get all results of all executions (on my my windows and or cygwin :-(
    like:
    <?php
    // your class prompt()

    echo "Enter something or 'exit' to quit\n";
    do {
            $cmdline = new prompt();
            $buffer = $cmdline->get('shell command: ');
    // init/ reset first!
            $data = null;
            $return = null;
    // now start:
            echo "You said: $buffer\n";
        if (!empty(    $buffer)) {
                $x = exec($buffer, $data, $return);
                print_r($data);
        }
    } while (    $buffer !== "exit");
    echo     "Goodbye\n";
    plz at dont dot spam
    11 years ago
    To get all arguments passed to a batch file in one variable
    rather than using %1 %2 %3 etc;

    :LOOP
    if "%1" == "" goto DONE
    set args=%args% %1
    shift
    goto LOOP
    :DONE
    @c:\\php\\cli\\php.exe script.php %args%
    set args=
    jewfish at jewfish dot net
    13 years ago
    There is a simpler way to do a multiline read than above:

    function multiline() {
        while(($in = readline("")) != ".")
            $story .= ($PHP_OS == "WINNT") ? "\r\n".$in :
                                             "\n".$in;

        return $story;
    }
    joshua at neocodesoftware.com
    14 years ago
    Here's an example simple readline-like way to input from command line on windows - the single line is from http://www.phpbuilder.com/columns/darrell20000319.php3, the multiline is something I added...

    <?
    function read () {
        # 4092 max on win32 fopen

        $fp=fopen("php://stdin", "r");
        $in=fgets($fp,4094);
        fclose($fp);

        # strip newline
        (PHP_OS == "WINNT") ? ($read = str_replace("\r\n", "", $in)) : ($read = str_replace("\n", "", $in));

        return $read;
    }

    function multilineread () {
        do {
            $in = read();

            # test exit
            if ($in == ".") return $read;

            # concat input
            (PHP_OS == "WINNT") ? ($read = $read . ($read ? "\r\n" : "") . $in) : ($read = $read . "\n" . $in);

        } while ($inp != ".");

        return $read;
    }

    print("End input with . on line by itself.\n");

    print("What is your first name?\n");
    $first_name = multilineread();

    print("What is your last name?\n");
    $last_name = read();

    print("\nHello, $first_name $last_name! Nice to meet you! \n");
    ?>
    jcl atNOSPAM jcl dot name
    11 years ago
    Even better than 'plz at dont dot spam' in only one line :) :

    @c:\\php\\cli\\php.exe script.php %*

    Cheers,
    Jean-Charles
    ds at NOSPAM dot undesigned dot org dot za
    12 years ago
    You can open /dev/tty on unix systems or \con in windows, with ob_implicit_flush(true) to write output unbuffered.  Works like a charm :-)

    -------------------------------

    #!/usr/local/bin/php -q
    <?php

    set_time_limit    (0);
    @    ob_end_flush();
    ob_implicit_flush(true);

    class     prompt {
      var     $tty;

      function     prompt() {
        if (    substr(PHP_OS, 0, 3) == "WIN") {
              $this->tty = fOpen("\con", "rb");
        } else {
          if (!(    $this->tty = fOpen("/dev/tty", "r"))) {
                $this->tty = fOpen("php://stdin", "r");
          }
        }
      }

      function     get($string, $length = 1024) {
        echo     $string;
            $result = trim(fGets($this->tty, $length));
        echo     "\n";
        return     $result;
      }
    }

    echo     "Enter something or 'exit' to quit\n";
    do {
          $cmdline = new prompt();
          $buffer = $cmdline->get("Something: ");
      echo     "You said: $buffer\n";
    } while (    $buffer !== "exit");
    echo     "Goodbye\n";

    ?>
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