imagepstext() appears to be quite memory intensive and we had a problem where about 50% of the time the script would error. You need to make sure PHP has enough memory assigned to it - we had to increase PHP's allocation from 8MB to 16MB for a simple "hello world" example to work smoothly.
If the png header was commented out it would sometimes error with a message like:
Warning: imagepstext() [function.imagepstext]: T1Lib Error 11 or 14
and if the png header was there it would sometimes say:
The image [...] cannot be displayed, because it contains errors.
imagepstext
(PHP 4, PHP 5)
imagepstext — PostScript Type1 フォントを使い、画像にテキストを描画する
警告
この機能は PHP 7.0.0 で 削除 されました。
説明
imagepstext
( resource
$image
, string $text
, resource $font_index
, int $size
, int $foreground
, int $background
, int $x
, int $y
[, int $space = 0
[, int $tightness = 0
[, float $angle = 0.0
[, int $antialias_steps = 4
]]]] ) : arrayPostScript Type1 フォントを使い、画像にテキストを描画します。
この関数がどう動くかが理解できない場合、 フォントとフォントの測定システムに関するPostScript のドキュメントを参照してください。
パラメータ
-
image -
imagecreatetruecolor() のような画像作成関数が返す画像リソース。
-
text -
書き出すテキスト
-
font_index -
imagepsloadfont() により返されるフォントリソース
-
size -
sizeはピクセル単位で指定します。 -
foreground -
テキストを描画する色
-
background -
アンチエイリアスによって隠されるテキストの色。
backgroundで指定される色は実際には描画されません。 よって、背景画像は無地である必要はありません。 -
x -
はじめの文字の左下のx座標
-
y -
はじめの文字の左下のy座標
-
space -
フォントのスペースのデフォルト値を変更できます。 スペースの合計は通常の値に足されます。負の値も指定可能です。 文字のスペース単位で表され、1単位は em の 1/1000 単位です。
-
tightness -
tightnessによって、 文字間のホワイトスペースの量を制御できます。 この合計値は通常の文字の幅に足されます。負の値も指定可能です。 文字のスペース単位で表され、1単位は em の 1/1000 単位です。 -
angle -
angleは角度です。 -
antialias_steps -
テキストをアンチエイリアスするのに使う色数を制御できます。 有効な値は4から16の間です。フォントサイズが20より小さい場合は、より大きな値を推奨します。 なぜなら、テキストに現れる効果がとても見えやすいからです。 20以上の場合、4を使ってください。計算資源をあまり使わなくなるからです。
返り値
この関数は 以下の要素を含む配列を返します:
| 0 | 左下のx座標 |
| 1 | 左下のy座標 |
| 2 | 右上のx座標 |
| 3 | 右上のy座標 |
変更履歴
| バージョン | 説明 |
|---|---|
| 7.0.0 | PHP から T1Lib サポートが削除されたため、この関数は削除されました。 |
例
例1 imagepstext() の使用例
<?php
// Create image handle
$im = imagecreatetruecolor(200, 200);
// Allocate colors
$black = imagecolorallocate($im, 0, 0, 0);
$white = imagecolorallocate($im, 255, 255, 255);
// Load the PostScript Font
$font = imagepsloadfont('font.pfm');
// Write the font to the image
imagepstext($im, 'Sample text is simple', $font, 12, $black, $white, 50, 50);
// Output and free memory
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
?>
注意
注意: この関数は、PHP が --with-t1lib を指定してコンパイルされている場合のみ使用可能です。
add a note
User Contributed Notes 12 notes
chrislewis60 at hotmail dot com ¶
17 years ago
soletan at toxa dot de ¶
14 years ago
As of PHP 5.2.13 with bundled GD (2.0.34) antialiasing_steps mustn't be "4 to 16", but "4 or 16". Values from 5 to 15 result in a warning.
whitemarker dot blogspot dot com ¶
17 years ago
The documentation above is bad. It says $font:
"Can be 1, 2, 3, 4, 5 for built-in fonts in latin2 encoding (where higher numbers corresponding to larger fonts) or any of your own font identifiers registered with imageloadfont()."
But it can't. When I put in 1,2,3,4,5 I get
"Warning: imagepstext() expects parameter 3 to be resource, integer given"
I get the same thing when using imageloadfont() because imageloadfont() also returns an integer. The documentation should instead say:
"resource returned from imagepsloadfont()."
honza dot bartos at gmail dot com ¶
18 years ago
The coordinates given by x, y represent actually a starting point of the text baseline. They represent the lower left corner of the first character only in case that any part of the character doesn't lie below baseline (it works for "Hello" but for "Howdy" it does not - because of letter y). There may be some small differences according to the font and size chosen.
johan (at) 1way2print.net ¶
22 years ago
If you use fonts with special chars, remeber to read in the encoded file *.enc with imagepsencodefont ... etc. for Danish, Swedish, German.....
a at url dot de ¶
22 years ago
a note on kernnig:
t1lib tries to load a corresponding afm file in the directory of the font file.
it does this by replacing the extension (.PFB .pfb) with ".afm". note that this has to be a lowercase afm! usually windows-ps-fonts have file names in all-uppercase, so try renaming the *.AFM file to *.afm.
i also noticed that sometimes this gives an error -2. it seems like t1lib chokes on windows-linebreaks in the afm file.
try 'recode dos..lat1 fontfile.afm' and check again.
if it all works, combinations like "Ta" or "Te" should show the second letter slightly moved to the capital T (on normal fonts like Times anyway).
npdavis at hotmail dot com ¶
23 years ago
If you have a programming error in your code, using ImagePsText, sometimes t1lib crashes with an unrecoverable error. Because of this, httpd needs to be restarted.
This problem only occurs if there is a programming error, but can drive you crazy when debugging, if you don't know about it. By killing the parent process(httpd) you "reset" t1lib. When debugging, if you get an error then make a code change, restart httpd before testing it again. This will save hours of frustration. Make it a habit to just restart httpd after every error, and you will be much happier.
Also, to see debugging messages, (if you are rendering x's) comment the jpeg header, and the ImageJpeg statement. You will get beautiful error messages. When you get a blank page, your ImagePsText code is working correctly. Uncomment the Header() and ImageJpeg() and see what you have. You might be passing parameters that render a white image with no text, but the code is working!
Numeric t1lib error messages can be decoded using the t1lib_doc.pdf file that comes with t1lib. PHP simply relays these errors from t1lib to the page. Please don't ask the PHP people about these errors... t1lib has beautiful documentation.... use it: )
thx,
Neil
heckp at uni-trier.de ¶
21 years ago
It is important so make shure that the "text" really is a string.
imagepstext ($im, $text, $font, $textsize, $black, $white, 10, 10);
won't work if $text is undefined, so PHP will quit with an error.
so always write it like this:
imagepstext ($im, "$text", $font, $textsize, $black, $white, 10, 10);
npdavis at hotmail dot com ¶
23 years ago
One other thing... variables. It is important to convert variables to the proper type before they hit this function. In this respect, ImageTtfText is easier to work with. IE, if you pass a font size from one page to the next, via GPC, it becomes a string type. Sooo... use IntVal() to convert it to an integer type that ImagePsText can digest. In addition you must convert HTML special characters or use chr() to represent special characters. ImagePsFont will not decode to represent a space, use Chr(32) or a space:
<?php
$fontsize=IntVal($fontsize);
$font=ImagePsLoadFont("fonts/IntR.pfb");
ImagePsText($im, $textstring, $font, $fontsize, $textcolor, $background, 0, $fontsize,'','','',16); //note antialias is set
ImagePsFreeFont($font);
?>
thx,
Neil
m.confalonieri(at)mclink.it ¶
21 years ago
I found a way to let imagepstext understand 32-bit colors (RGBA) by replacing in gd.c:PHP_FUNCTION(imagepstext)
int _fg, _bg, x, y, size, space = 0, aa_steps = 4, width = 0;
with
unsigned int _fg, _bg, x, y, size, space = 0, aa_steps = 4, width = 0;
npdavis at hotmail dot com ¶
23 years ago
with a font included in t1lib:
<?PHP
Header ("Content-type: image/jpeg");
$im = ImageCreate (350, 45);
$black = ImageColorAllocate ($im, 0, 0, 0);
$white = ImageColorAllocate ($im, 255, 255, 255);
$font=ImagePsLoadFont("bchbi.pfb");
ImagePsText($im, "Testing... It worked!",
$font, 32, $white, $black, 32, 32);
ImagePsFreeFont($font);
ImageJpeg($im, "", 100);//for best quality... your mileage may vary
ImageDestroy ($im);
?>
Better than using freetype, but with freetype2, the difference is marginal. To flip backround and foreground colors, alternate the order of ImageColorAllocate statements.
If you get outlines (the antialiasing produces these) reverse the $black and $white color identifiers in the ImagePsText function.
Happy PostScripting!
thx,
Neil
Jeroen dot Straahof at newego dot nl ¶
21 years ago
I made a function that makes it easy to align text to the right
of an image. Below you can find the code because for me it
works great. You can also use it to center text as well, if you
like to have that simply remove the -10 and split the result
of $imgwidth and $texwidth
function AlignRight($string, $font, $imgwidth, $fontsize) {
list($lx,$ly,$rx,$ry) = imagepsbbox($string,$font,$fontsize,0,0,0);
$textwidth = $rx - $lx;
$imw = ($imgwidth-10-$textwidth);
return $imw;
}
