imageftbbox

(PHP 4 >= 4.0.7, PHP 5, PHP 7, PHP 8)

imageftbbox — 给出一个使用 FreeType 2 字体的文本框

说明

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.

参数

size

字体的尺寸，单位：点（磅）。

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

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.

范例

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 whiteimagefilledrectangle($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, $font, 'The PHP Documentation Group');
// Output to browserheader('Content-Type: image/png');
imagepng($im);
imagedestroy($im);
?>

注释

注意: 此函数仅在 PHP 编译时加入 freetype 支持时有效（--with-freetype-dir=DIR）。

更新日志

版本	说明
4.3.5	`extrainfo` was made optional.

PHP（0）