Description:
------------
Since PHP supports spreading named parameters, i'd like to see 
imagettfbbox and imagettftext using the same paramater names.

imagettfbbox uses $string for the text
imagettfbbox uses $text   for the text



Test script:
---------------
<?php
//header("Content-Type: image/png");
$im = @imagecreate(200, 200)
or die("Cannot Initialize new GD image stream");
$background_color = imagecolorallocate($im, 50, 50, 200);
$text_color = imagecolorallocate($im, 255,255,255);

$fontConfig = [
    'size' => 75,
    'angle' => 0,
    'font_filename' => "Roboto-Regular.ttf",
    'string'    => 'PA',
];

$bb = imagettfbbox(...$fontConfig);
$w = $bb[2] - $bb[0];
$h = $bb[3] - $bb[1];
imagettftext(...([
        'image' => $im,
        'color' => $text_color,
        'x' => (100-$w/2),
        'y' => (100-$h/2),

             ]+$fontConfig));

imagepng($im);
imagedestroy($im);

Expected result:
----------------
No Error

Actual result:
--------------
Fatal error: Uncaught Error: Unknown named parameter $string in image.php:24