PHP readline produces scandir-CodePudding

I've noticed strange behavior from readline while using it for user input from a CLI.

When I press multiple tabs it prints a scandir to the input stream.

Below is the code:

$msg = "";
while ($msg != "quit")
{
    while (($msg == "") || ($msg == "\r"))
        $msg = readline ("> ");
}

CodePudding user response：

This is behavior from your shell. You will get the same result without running the PHP script. At the prompt, type > and tab twice.

You can prevent this by registering a no-op completion with readline_completion_function.

<?php
$msg = "";
readline_completion_function(function ()
{
    return [];
});
while ($msg != "quit")
{
    while (($msg == "") || ($msg == "\r"))
    {
        $msg = readline("> ");
    }
}

CodePudding user response：

To stop this behavior, register an auto complete function that returns no matches to auto complete.

function dontAutoComplete ($input, $index)
{ return ([]); }

readline_completion_function ("dontAutoComplete");