imageftbbox
(PHP 4 >= 4.0.7, PHP 5, PHP 7, PHP 8)
imageftbbox — 給出一個使用 FreeType 2 字型的文字框
說明
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.
參數
-
size -
字型的尺寸，單位：點（磅）。
-
angle -
Angle in degrees in which
textwill 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 extrainfoKey Type Meaning linespacingfloat Defines drawing linespacing
返回值
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.
範例
示例 #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);
?>
註釋
注意: 此函式僅在 PHP 編譯時加入 freetype 支援時有效（--with-freetype-dir=DIR）。
更新日誌
| 版本 | 說明 |
|---|---|
| 4.3.5 |
extrainfo was made optional.
|