= 4.0.7, PHP 5, PHP 7, PHP 8)imageftbbox — 給出一個(gè)使用 FreeType 2 字體的文本框說(shuō)明imageftbbox( float $size, float $angle, string $fontf">

imageftbbox

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

imageftbbox — 給出一個(gè)使用 FreeType 2 字體的文本框

說(shuō)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.

參數(shù)

size

字體的尺寸，單位：點(diǎn)（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 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);
?>

注釋

注意: 此函數(shù)僅在 PHP 編譯時(shí)加入 freetype 支持時(shí)有效（--with-freetype-dir=DIR）。

更新日志

版本 說(shuō)明
4.3.5 extrainfo was made optional.