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imageftbbox

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(PHP 4 >= 4.0.7, PHP 5, PHP 7)

imageftbbox — Give the bounding box of a text using fonts via freetype2

Description

imageftbbox ( float $size , float $angle , string $fontfile , string $text [, array $extrainfo ] ) : array

This function calculates and returns the bounding box in pixels for a FreeType text.

Note:

imageftbbox() is an extended variant of imagettfbbox() which additionally supports the extrainfo.

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Parameters

size

The font size in points.

angle

Angle in degrees in which text will be measured.

fontfile

The name of the TrueType font file (can be a URL). Depending on which version of the GD library that PHP is using, it may attempt to search for files that do not begin with a leading '/' by appending '.ttf' to the filename and searching along a library-defined font path.

text

The string to be measured.

extrainfo

Possible array indexes for extrainfo
Key Type Meaning
linespacing float Defines drawing linespacing

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Return Values

imageftbbox() 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.

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Examples

Example #1 imageftbbox() 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
$bbox = imageftbbox(10, 0, $font, 'The PHP Documentation Group');

// This is our cordinates for X and Y
$x = $bbox[0] + (imagesx($im) / 2) - ($bbox[4] / 2) - 5;
$y = $bbox[1] + (imagesy($im) / 2) - ($bbox[5] / 2) - 5;

imagefttext($im, 10, 0, $x, $y, $black, $font, 'The PHP Documentation Group');

// Output to browser
header('Content-Type: image/png');

imagepng($im);
imagedestroy($im);
?>

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Notes

Note: This function is only available if PHP is compiled with freetype support (--with-freetype-dir=DIR )

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See Also

  • imagefttext() - Write text to the image using fonts using FreeType 2
  • imagettfbbox() - Give the bounding box of a text using TrueType fonts

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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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