imageftbbox

Description
Syntax
Examples
Links

Description

The imageftbbox of Image for PHP give the bounding box of a text using fonts via FreeType 2.

Syntax

imageftbbox(
    float $size,
    float $angle,
    string $font_filename,
    string $string,
    array $options = []
): array|false

Parameters

angle

The angle in degrees.

Higher values represent a counter-clockwise rotation. 0 degrees reads left-to-right. 90 degrees reads bottom-to-top.

Depending on which version of the GD library PHP is using, when font_filename does not begin with a leading / then .ttf will be appended to the filename and the library will attempt to search for that filename along a library-defined font path.

When using versions of the GD library lower than 2.0.18, a space character, rather than a semicolon, was used as the 'path separator' for different font files. Unintentional use of this feature will result in the warning message: Warning: Could not find/open font. For these affected versions, the only solution is moving the font to a path which does not contain spaces.

In many cases where a font resides in the same directory as the script using it the following trick will alleviate any include problems.

Note: Note that open_basedir does not apply to font_filename.

<?
// Set the environment variable for GD
putenv('GDFONTPATH=' . realpath('.'));

// Name the font to be used (note the lack of the .ttf extension)
$font = 'SomeFont';
?>

string

The string to be measured.

options

Key	Type	Description
linespacing	float	Defines drawing linespacing

Return

Returns an array with 8 elements defining the four points of the bounding box of the text on success and false on error.

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.

Key	Description
0	lower left x
1	lower left y
2	lower right x
3	lower right y
4	upper right x
5	upper right y
6	upper left x
7	upper left y

Examples

1 · return

<?

$size = 8;
$angle = 0;
$font_filename = $_SERVER['DOCUMENT_ROOT'] . '/assets/ttf/arial.ttf';
$string = "string";
$options = array(
    0
);

$return = imageftbbox($size, $angle, $font_filename, $string, $options);

var_export($return);

?>

array (
  0 => 0,
  1 => 2,
  2 => 25,
  3 => 2,
  4 => 25,
  5 => -7,
  6 => 0,
  7 => -7,
)

2 · base64

<?

$width = 100;
$height = 100;
$image = imagecreatetruecolor($width, $height);

$red = 255;
$green = 255;
$blue = 255;
$color = imagecolorallocate($image, $red, $green, $blue);

$size = 8;
$angle = -45;
$font_filename = $_SERVER['DOCUMENT_ROOT'] . '/assets/ttf/arial.ttf';
$string = "string";
$options = array(
    0
);
$box = imageftbbox($size, $angle, $font_filename, $string, $options);

$x = $box[0] + ((imagesx($image) - $box[4]) / 2);
$y = $box[1] + ((imagesy($image) - $box[5]) / 2);
imagefttext($image, $size, $angle, $x, $y, $color, $font_filename, $string, $options);

ob_start();

    imagepng($image);

$output = ob_get_clean();

echo '<!doctype html>
<html>
<body>
    <img src="data:image/png;base64,' . base64_encode($output) . '">
</body>
</html>';

?>

<!doctype html>
<html>
<body>
    <img src="data:image/png;base64,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">
</body>
</html>