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This document uses PHP Chinese website manual Release
(PHP 4 >= 4.3.0, PHP 5, PHP 7)
gd_info — 取得当前安装的 GD 库的信息
返回一个关联数组描述了安装的 GD 库的版本和性能。
属性 | 含义 |
---|---|
GD Version | string 值描述了安装的 libgd 的版本。 |
Freetype Support | boolean 值。如果安装了 Freetype 支持则为 TRUE 。 |
Freetype Linkage | string 值描述了 Freetype 连接的方法。取值可能为:'with freetype',
'with TTF library' 和 'with unknown library'。本单元仅在
Freetype Support 的值为 TRUE 时有定义。
|
T1Lib Support | boolean 值。如果包含有 T1Lib 支持则为 TRUE 。 |
GIF Read Support | boolean 值。如果包含有读取 GIF 图像的支持则为 TRUE 。
|
GIF Create Support | boolean 值。如果包含有创建 GIF 图像的支持则为 TRUE 。
|
JPG Support | boolean 值。如果包含有 JPG 支持则为 TRUE 。 |
PNG Support | boolean 值。如果包含有 PNG 支持则为 TRUE 。 |
WBMP Support | boolean 值。如果包含有 WBMP 支持则为 TRUE 。 |
XBM Support | boolean 值。如果包含有 XBM 支持则为 TRUE 。 |
Example #1 使用 gd_info()
<?php
var_dump ( gd_info ());
?>
典型输出为:
array(9) { ["GD Version"]=> string(24) "bundled (2.0 compatible)" ["FreeType Support"]=> bool(false) ["T1Lib Support"]=> bool(false) ["GIF Read Support"]=> bool(true) ["GIF Create Support"]=> bool(false) ["JPG Support"]=> bool(false) ["PNG Support"]=> bool(true) ["WBMP Support"]=> bool(true) ["XBM Support"]=> bool(false) }
参见 imagepng() , imagejpeg() , imagegif() , imagewbmp() 和 imagetypes() 。
[#1] Hagan Fox [2005-05-03 04:35:23]
This function safely determines the GD version, even on PHP versions earlier than 4.3 that lack the gd_info() function. Use it to avoid having your script halt with a fatal error if you try to use a TrueColor function and the GD version isn't 2.0 or later.
You can optionally specify a version, but if you specify version 2 it might be overridden. Once the version number is determined it's retained to speed future calls.
<?php
function gdVersion($user_ver = 0)
{
if (! extension_loaded('gd')) { return; }
static $gd_ver = 0;
// Just accept the specified setting if it's 1.
if ($user_ver == 1) { $gd_ver = 1; return 1; }
// Use the static variable if function was called previously.
if ($user_ver !=2 && $gd_ver > 0 ) { return $gd_ver; }
// Use the gd_info() function if possible.
if (function_exists('gd_info')) {
$ver_info = gd_info();
preg_match('/\d/', $ver_info['GD Version'], $match);
$gd_ver = $match[0];
return $match[0];
}
// If phpinfo() is disabled use a specified / fail-safe choice...
if (preg_match('/phpinfo/', ini_get('disable_functions'))) {
if ($user_ver == 2) {
$gd_ver = 2;
return 2;
} else {
$gd_ver = 1;
return 1;
}
}
// ...otherwise use phpinfo().
ob_start();
phpinfo(8);
$info = ob_get_contents();
ob_end_clean();
$info = stristr($info, 'gd version');
preg_match('/\d/', $info, $match);
$gd_ver = $match[0];
return $match[0];
} // End gdVersion()
// Usage:
if ($gdv = gdVersion()) {
if ($gdv >=2) {
echo 'TrueColor functions may be used.';
} else {
echo 'GD version is 1. Avoid the TrueColor functions.';
}
} else {
echo "The GD extension isn't loaded.";
}
?>
The function only detects the GD version, but you could determine GD capabilities in a similar manner.
[#2] yohami dot com - zerodj at hotmail dot com [2004-01-14 07:09:07]
A cool resize / cropping script for creating thumbnails using mogrify
IMAGETEST.PHP
<?php
include 'mogrify.php';
// variables from flash (my website uses flash and php)
$picture="sample.jpg";
$fixedwidth=300;
$fixedheight=240;
//
cropimage($picture,$fixedwidth,$fixedheight,$mogrify);
?>
MOGRIFY.PHP
<?php
// walking the path
$mogrify="C:/apache/Imagik/mogrify.exe";
// ---------------------------------------- crop function
function cropimage($picture,$fixedwidth,$fixedheight,$mogrify) {
// GET IMG
$img = imagecreatefromjpeg($picture);
$width= imagesx($img);
$height= imagesy($img);
// CROP WIDTH
if($width!=$fixedwidth){
$ratio =$fixedwidth/$width;
$NewHeight=round($height*$ratio);
$NewWidth=round($width*$ratio);
exec( $mogrify." -resize ".$NewWidth."x".$NewHeight."! $picture");
exec( $mogrify." -crop ".$fixedwidth."x".$fixedheight."+0+0 $picture");
// REFRESH
$img = imagecreatefromjpeg($picture);
$width= imagesx($img);
$height= imagesy($img);
}
// CROP HEIGHT
if($height!=$fixedheight){
$ratio =$fixedheight/$height;
$NewHeight=round($height*$ratio);
$NewWidth=round($width*$ratio);
exec( $mogrify." -resize ".$NewWidth."x".$NewHeight."! $picture");
exec( $mogrify." -crop ".$fixedwidth."x".$fixedheight."+0+0 $picture");
}
//
ImageDestroy($img);
}
?>
yeah!