wrap and center text in gd and php - php

Question

I have a line of text that i need to wrap and center in a GD image. I am using a ttf font as well. Can anything give me some assistance please?
I have managed to get some text to wrap doing the following, but now i need to get it to center:
function wrap($fontSize, $angle, $fontFace, $string, $width){
$ret = "";
$arr = explode(' ', $string);
foreach ( $arr as $word ){
$teststring = $ret.' '.$word;
$testbox = imagettfbbox($fontSize, $angle, $fontFace, $teststring);
if ( $testbox[2] > $width ){
$ret.=($ret==""?"":"\n").$word;
} else {
$ret.=($ret==""?"":' ').$word;
}
}
return $ret;
}

Answer 1

User valentijn de Pagter provides, on php net manual, a nice function to calculate the box (I see you're using imagettfbbox(), indeed) and from the array it returns calculate how to center text. You can find it here:
center text with imagettfbbox

Answer 2

To center both horizontally and vertically: get half height from imagettfbbox of whole text (with new lines) and substract it from half height of your image ($start_x).
Now split text by new lines, create ttfbox for every line and get it's height ($h) and half width ($w). Draw line starting from half image width + $w and $start_x, add $h to $start_x, repat until all lines are written.

Answer 3

This is what I did. using the imagettftext function, you can add new line marks and continue on to the next line. You can add \n to the string after a certain amount of characters. This example will only break on spaces, so words won't get cut off.
$description=$property['description'];
$len=strlen($description);
$str="";
$c=0;
for($i=0;$i<$len;$i++){
$chr=substr($description,$i,1);
$str.=$chr;
if($c>40 && $chr==" ") {
$str.="\n";
$c=0;
}
$c++;
}
$result=$str;
imagettftext($img, 15, 0, $x - 60, $descmgn, $textcolor, $font, $result);