imageftbbox

imagettfbbox() returns an array with 8 elements representing four points making the bounding box of the text: 0 lower left corner, X position 1 lower left corner, Y position 2 lower right corner, X position 3 lower right corner, Y position 4 upper right corner, X position 5 upper right corner, Y position 6 upper left corner, X position 7 upper left corner, Y position The points are relative to the text regardless of the angle, so "upper left" means in the top left-hand corner seeing the text horizontally.

This function can be used to generate right-aligned text. Just work out how wide the text image is and position it accordingly. Example:$i_width  = 200;$i_height = 40;$string = "Hello World!";$pointsize = 10;$fontfile = "/usr/local/lib/ttf/Helve.ttf";$im = imagecreate($i_width, $i_height);$black = imagecolorallocate ($im, 0, 0, 0);$white = imagecolorallocate ($im, 255, 255, 255);$string_size = ImageFtBbox($pointsize, 0, $fontfile, $string, array("linespacing" => 1));$s_width  = $string_size[4];$s_height = $string_size[5];ImageFtText($im, $pointsize, 0, $i_width - $s_width - 1,  0 - $s_height, $white, $fontfile, $string, array("linespacing" => 1));Header ("Content-type: image/png");ImagePNG ($im);ImageDestroy ($im);

Here is a handy example I used to center "dynamic text" onto an image.  Ex. Say you want to center a clients IP Address onto a picture.  $ip=$_SERVER['REMOTE_ADDR'];    $details = imageftbbox($fontsize, 0, $font, $ip, array("linespacing" => 1));$xcoord = ($imgwidth - $details[4]) / 2;  // this will return the x coordinate centered to your specific image.  Make sure  you set $imgwidth to the width of the image you are using.      imagettftext($image, $fontsize, 0, $xcoord, $ycoord, $fontcolor, $font, $ip);

ah... the problem between imageftbbox() and imagefttext() lies in the mirroring of the y-axes.Below you see, for a font-size 16 the boudingboxes of "b", "p" and "bp":< b: w=9 h=15b(0,-1)b(9,-1)b(9,-16)b(0,-16)< p: w=9 h=16p(0,4)p(9,4)p(9,-12)p(0,-12)< bp: w=20 h=20bp(0,4)bp(20,4)bp(20,-16)bp(0,-16)If drawing "bp" using imagefttext() at y=0, the the top of "bp" indeed is at y=-16, and the bottom of "bp" at y=4. (Plus or minus a pixel here and there, because at y=0 there actually is a vissible pixel.)

//EXAMPLE - Center textfunction newText($im, $size, $angle= 0, $x, $y, $color, $font, $text,$align = "left",$border=false,$width=0,$height=0){        if($align == "center")    {        if ($border == true ){           imagerectangle($im, $x, $y, $x +$width, $y + $height, $color);        }        $bbox = imageftbbox($size, 0, $font, $text);        // Marcamos el ancho y alto        $s_width  = $bbox[4];        $s_height = $bbox[5];                  $y = $y + ($height-$s_height)/2;        $x = $x + ($width-$s_width)/2;    }         imagettftext($im, $size, $angle, $x, $y, $color, $font, $text);}

For alignment i used this method:if($align == "center" || $align == "right")    {        $verticaltxtspace = $backwidth - (2 * $posx);                $spacepositions = imagettfbbox($size, $angle, "fonts/verdanaz.ttf", " ");                 $spacepx = $spacepositions[4] - $spacepositions[0];                        // Split text in lines        $lines = split("[\r][\n]", $text);                for($count = 0; $count < count($lines); $count++)        {            $textpositions = imagettfbbox($size, $angle, "fonts/verdanaz.ttf", $lines[$count]);                        $textpx = $textpositions[2] - $textpositions[0];                        if($align == "right")            {                $spaces = ($verticaltxtspace - $textpx) / $spacepx;            }            else if($align == "center")            {                $spaces = (($verticaltxtspace - $textpx)/2) / $spacepx;            }                        // Add spaces            $line = $lines[$count];            for($i = 0; $i < $spaces; $i++)            {                $line = " " . $line;            }            $lines[$count] = $line;        }                // Create new text of lines        $text = "";        for($count = 0; $count < count($lines); $count++)        {            $text .= $lines[$count] . "\r\n";        }            }                //    Draw the shadow text on de shadow    imagettftext($background, $size, $angle, $posx, $posy, $textcolor, "fonts/verdanaz.ttf",  $text);

i've found a work around for this situationit seems that height is directly proportional to line spacing so you just have to apply the same factor to image heightfor example :$spacing = 0.7;$params = array("linespacing" => $spacing);$box = imageftbbox ($size, 0, $font, $text, $params);$tw=$box[4]-$box[0]; //image width$th=($box[1]-$box[5])*$spacing; //image height

ImageFTBBox returns a bounding box, not metrics, as some (most?) of the notes above seem to assume. The 8 values it returns specify the 4 corners of this bounding box. So to properly determine the width and height of a string you need to do:$bbox = ImageFTBBox(...);$width = abs($bbox[0]) + abs($bbox[2]); // distance from left to right$height = abs($bbox[1]) + abs($bbox[5]); // distance from top to bottom