Clear PHP CLI output

Question

I\'m trying to get a \"live\" progress indicator working on my php CLI app. Rather than outputting as

1Done
2Done
3Done

I would rather it c

Answer 1

i know the question isn't strictly about how to clear a SINGLE LINE in PHP, but this is the top google result for "clear line cli php", so here is how to clear a single line:

function clearLine()
{
    echo "\033[2K\r";
}

Answer 2

Console functions are platform dependent and as such PHP has no built-in functions to deal with this. system and other similar functions won't work in this case because PHP captures the output of these programs and prints/returns them. What PHP prints goes to standard output and not directly to the console, so "printing" the output of cls won't work.

Answer 3

<?php
error_reporting(E_ERROR | E_WARNING | E_PARSE);

function bufferout($newline, $buffer=null){
    $count = strlen(rtrim($buffer));
    $buffer = $newline;
    if(($whilespace = $count-strlen($buffer))>=1){
        $buffer .= str_repeat(" ", $whilespace);
    }
    return $buffer."\r"; 
};

$start = "abcdefghijklmnopqrstuvwxyz0123456789";
$i = strlen($start);

while ($i >= 0){
    $new = substr($start, 0, $i);
    if($old){
        echo $old = bufferout($new, $old);
    }else{
        echo $old = bufferout($new);
    }
    sleep(1);
    $i--;
}
?>

A simple implementation of @dkamins answer. It works well. It's a bit- hack-ish. But does the job. Wont work across multiple lines.

Answer 4

Tried some of solutions from answers:

<?php
...
    $messages = [
        '11111',
        '2222',
        '333',
        '44',
        '5',
    ];

    $endlines = [
        "\r",
        "\033[2K\r",
        "\r\033[K\033[1A\r\033[K\r",
        chr(27).chr(91).'H'.chr(27).chr(91).'J',
    ];
    foreach ($endlines as $i=>$end) {
        foreach ($messages as $msg) {
            output()->write("$i. ");
            output()->write($msg);
            sleep(1);
            output()->write($end);
        }
    }

And \033[2K\r seems like works correct.

Answer 5

something like this :

for ($i = 0; $i <= 100; $i++) {
    echo "Loading... {$i}%\r";
    usleep(10000);
}

Answer 6

I came across this while searching for a multi line solution to this problem. This is what I eventually came up with. You can use Ansi Escape commands. http://www.inwap.com/pdp10/ansicode.txt

<?php
function replaceOut($str)
{
    $numNewLines = substr_count($str, "\n");
    echo chr(27) . "[0G"; // Set cursor to first column
    echo $str;
    echo chr(27) . "[" . $numNewLines ."A"; // Set cursor up x lines
}

while (true) {
    replaceOut("First Ln\nTime: " . time() . "\nThird Ln");
    sleep(1);
}
?>