This function calculates and returns the bounding box in pixels
for a TrueType text.
text
The string to be measured.
size
The font size in pixels.
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.
angle
Angle in degrees in which text will be
measured.
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 requires both the GD library and the FreeType
library.
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Php imagettfbbox syntax tutorial
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