Description:
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Manual says:

array imagepstext ( resource $image, string $text, resource $font, int $size, int $foreground, int $background, int $x, int $y [, int $space [, int $tightness [, float $angle [, int $antialias_steps]]]] )

array imagepsbbox ( string $text, int $font, int $size [, int $space [, int $tightness [, float $angle]]] )

But... neither of the optional parameters is accepted.

Reproduce code:
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It's Ok:

<?php

header('Content-type: image/png');

$i = imagecreate(468, 60);
$b = imagecolorallocate($i, 0, 0, 0);
$w = imagecolorallocate($i, 255, 255, 255);
$f = imagepsloadfont(realpath('./meta-bold.pfb')); // realpath() is needed because the function requires full path
imagepstext($i, 'Testing... It worked!', $f, 40, $w, $b, 40, 40);
imagepsfreefont($f);
imagepng($i, null, 9, PNG_NO_FILTER);
imagedestroy($i);

?>

It's fail:

<?php

header('Content-type: image/png');

$i = imagecreate(468, 60);
$b = imagecolorallocate($i, 0, 0, 0);
$w = imagecolorallocate($i, 255, 255, 255);
$f = imagepsloadfont(realpath('./meta-bold.pfb')); // realpath() is needed because the function requires full path
imagepstext($i, 'Testing... It worked!', $f, 40, $w, $b, 40, 40, 2);
imagepsfreefont($f);
imagepng($i, null, 9, PNG_NO_FILTER);
imagedestroy($i);

?>

Expected result:
----------------
A banner with 2 space-unit of space.

Actual result:
--------------
Warning: Wrong parameter count for imagepstext()