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imageftbbox

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

imageftbbox通过 freetype2 使用字体给出文本的边界框

说明

imageftbbox(
    float $size,
    float $angle,
    string $font_filename,
    string $string,
    array $options = []
): array|false

此函数计算并返回 FreeType 文本的边界框(以像素为单位)。

注意:

在 PHP 8.0.0 之前,imageftbbox()imagettfbbox() 的扩展变体,它还支持 options。 自 PHP 8.0.0 起,imagettfbbox()imageftbbox() 的别名。

参数

size

字体的尺寸,单位:点(磅)。

angle

测量的 string 的角度(以度为单位)。

font_filename

TrueType 字体文件的名称(可以是 URL)。根据 PHP 使用的 GD 库的版本,可能会尝试搜索没有以“/”开头并会在末尾追加“.ttf”的文件名,并沿着库定义的字体路径搜索。

string

要测量的字符串。

options

options 可能的数组索引
类型 含义
linespacing float 定义绘制行距

返回值

imageftbbox() 返回包含 8 个元素的数组,代表构成文本边界框的四个点:

0 左下角,X 坐标
1 左下角,Y 坐标
2 右下角,X 坐标
3 右下角,Y 坐标
4 右上角,X 坐标
5 右上角, Y 坐标
6 左上角,X 坐标
7 左上角,Y 坐标

无论 angle 如何,这些点都是相对于 text,因此“左上角”意味着在左上角水平地看到文本。

失败时,返回 false

范例

示例 #1 imageftbbox() 示例

<?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);
?>

注释

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

参见

add a note

User Contributed Notes 8 notes

up
3
fernando
17 years ago
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.
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1
phpimageftbbox at juggernaut dot com dot au
20 years ago
This function can be used to generate right-aligned text. Just work out how wide the text image is and position it accordingly. Example:

$i_width  = 200;
$i_height = 40;

$string = "Hello World!";
$pointsize = 10;
$fontfile = "/usr/local/lib/ttf/Helve.ttf";

$im = imagecreate($i_width, $i_height);
$black = imagecolorallocate ($im, 0, 0, 0);
$white = imagecolorallocate ($im, 255, 255, 255);

$string_size = ImageFtBbox($pointsize, 0, $fontfile, $string, array("linespacing" => 1));
$s_width  = $string_size[4];
$s_height = $string_size[5];

ImageFtText($im, $pointsize, 0, $i_width - $s_width - 1,  0 - $s_height, $white, $fontfile, $string, array("linespacing" => 1));

Header ("Content-type: image/png");
ImagePNG ($im);
ImageDestroy ($im);
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1
pablocorezzola at gmail dot com
5 years ago
//EXAMPLE - Center text

function newText($im, $size, $angle= 0, $x, $y, $color, $font, $text,$align = "left",$border=false,$width=0,$height=0){
   
    if($align == "center")
    {
        if ($border == true ){
           imagerectangle($im, $x, $y, $x +$width, $y + $height, $color);
        }
        $bbox = imageftbbox($size, 0, $font, $text);

        // Marcamos el ancho y alto
        $s_width  = $bbox[4];
        $s_height = $bbox[5]; 
       
        $y = $y + ($height-$s_height)/2;
        $x = $x + ($width-$s_width)/2;

    }
    
    imagettftext($im, $size, $angle, $x, $y, $color, $font, $text);
}
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1
sectionthirty1 at yahoo dot com
18 years ago
Here is a handy example I used to center "dynamic text" onto an image. 

Ex. Say you want to center a clients IP Address onto a picture. 

$ip=$_SERVER['REMOTE_ADDR'];   

$details = imageftbbox($fontsize, 0, $font, $ip, array("linespacing" => 1));

$xcoord = ($imgwidth - $details[4]) / 2;  // this will return the x coordinate centered to your specific image.  Make sure  you set $imgwidth to the width of the image you are using.     

imagettftext($image, $fontsize, 0, $xcoord, $ycoord, $fontcolor, $font, $ip);
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0
theo v e -2
17 years ago
ah... the problem between imageftbbox() and imagefttext() lies in the mirroring of the y-axes.
Below you see, for a font-size 16 the boudingboxes of "b", "p" and "bp":
< b: w=9 h=15
b(0,-1)
b(9,-1)
b(9,-16)
b(0,-16)
< p: w=9 h=16
p(0,4)
p(9,4)
p(9,-12)
p(0,-12)
< bp: w=20 h=20
bp(0,4)
bp(20,4)
bp(20,-16)
bp(0,-16)
If drawing "bp" using imagefttext() at y=0, the the top of "bp" indeed is at y=-16, and the bottom of "bp" at y=4. (Plus or minus a pixel here and there, because at y=0 there actually is a vissible pixel.)
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-1
Johan
15 years ago
For alignment i used this method:

if($align == "center" || $align == "right")
    {
        $verticaltxtspace = $backwidth - (2 * $posx);       
        $spacepositions = imagettfbbox($size, $angle, "fonts/verdanaz.ttf", " ");        
        $spacepx = $spacepositions[4] - $spacepositions[0];       
       
        // Split text in lines
        $lines = split("[\r][\n]", $text);       
        for($count = 0; $count < count($lines); $count++)
        {
            $textpositions = imagettfbbox($size, $angle, "fonts/verdanaz.ttf", $lines[$count]);           
            $textpx = $textpositions[2] - $textpositions[0];
           
            if($align == "right")
            {
                $spaces = ($verticaltxtspace - $textpx) / $spacepx;
            }
            else if($align == "center")
            {
                $spaces = (($verticaltxtspace - $textpx)/2) / $spacepx;
            }
           
            // Add spaces
            $line = $lines[$count];
            for($i = 0; $i < $spaces; $i++)
            {
                $line = " " . $line;
            }
            $lines[$count] = $line;
        }
       
        // Create new text of lines
        $text = "";
        for($count = 0; $count < count($lines); $count++)
        {
            $text .= $lines[$count] . "\r\n";
        }       
    }
   
       
    //    Draw the shadow text on de shadow
    imagettftext($background, $size, $angle, $posx, $posy, $textcolor, "fonts/verdanaz.ttf",  $text);
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-2
ta at NOSPAM dot magicsquare dot info
20 years ago
i've found a work around for this situation

it seems that height is directly proportional to line spacing so you just have to apply the same factor to image height

for example :

$spacing = 0.7;
$params = array("linespacing" => $spacing);

$box = imageftbbox ($size, 0, $font, $text, $params);
$tw=$box[4]-$box[0]; //image width
$th=($box[1]-$box[5])*$spacing; //image height
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-3
groomed at users dot sf dot net
18 years ago
ImageFTBBox returns a bounding box, not metrics, as some (most?) of the notes above seem to assume. The 8 values it returns specify the 4 corners of this bounding box. So to properly determine the width and height of a string you need to do:

$bbox = ImageFTBBox(...);
$width = abs($bbox[0]) + abs($bbox[2]); // distance from left to right
$height = abs($bbox[1]) + abs($bbox[5]); // distance from top to bottom
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