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imagettfbbox
(PHP 4, PHP 5, PHP 7)
imagettfbbox — Give the bounding box of a text using TrueType fonts
Description
$size
, float $angle
, string $fontfile
, string $text
) : arrayThis function calculates and returns the bounding box in pixels for a TrueType text.
Note:
imageftbbox() is an extended variant of imagettfbbox() which additionally supports the
extrainfo.
Parameters
-
size -
The font size in points.
-
angle -
Angle in degrees in which
textwill be measured. -
fontfile -
The path to the TrueType font you wish to use.
Depending on which version of the GD library PHP is using, when
fontfiledoes 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.
<?php
// Set the enviroment variable for GD
putenv('GDFONTPATH=' . realpath('.'));
// Name the font to be used (note the lack of the .ttf extension)
$font = 'SomeFont';
?>Note:
Note that open_basedir does not apply to
fontfile. -
text -
The string to be measured.
Return Values
imagettfbbox() returns an array with 8
elements representing four points making the bounding box of the
text on success and FALSE on error.
| key | contents |
|---|---|
| 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.
Examples
Example #1 imagettfbbox() example
<?php
// Create a 300x150 image
$im = imagecreatetruecolor(300, 150);
$black = imagecolorallocate($im, 0, 0, 0);
$white = imagecolorallocate($im, 255, 255, 255);
// Set the background to be white
imagefilledrectangle($im, 0, 0, 299, 299, $white);
// Path to our font file
$font = './arial.ttf';
// First we create our bounding box for the first text
$bbox = imagettfbbox(10, 45, $font, 'Powered by PHP ' . phpversion());
// This is our cordinates for X and Y
$x = $bbox[0] + (imagesx($im) / 2) - ($bbox[4] / 2) - 25;
$y = $bbox[1] + (imagesy($im) / 2) - ($bbox[5] / 2) - 5;
// Write it
imagettftext($im, 10, 45, $x, $y, $black, $font, 'Powered by PHP ' . phpversion());
// Create the next bounding box for the second text
$bbox = imagettfbbox(10, 45, $font, 'and Zend Engine ' . zend_version());
// Set the cordinates so its next to the first text
$x = $bbox[0] + (imagesx($im) / 2) - ($bbox[4] / 2) + 10;
$y = $bbox[1] + (imagesy($im) / 2) - ($bbox[5] / 2) - 5;
// Write it
imagettftext($im, 10, 45, $x, $y, $black, $font, 'and Zend Engine ' . zend_version());
// Output to browser
header('Content-Type: image/png');
imagepng($im);
imagedestroy($im);
?>
Notes
Note: This function is only available if PHP is compiled with freetype support (--with-freetype-dir=DIR )
See Also
- imagettftext() - Write text to the image using TrueType fonts
- imageftbbox() - Give the bounding box of a text using fonts via freetype2
English translation
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Document created the 30/01/2003, last modified the 26/10/2018
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References
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