php提示Fatal error: Call to undefined function imagecreate()

在php中imagecreate函数是一个图形处理函数,主要用于新建一个基于调色板的图像了,然后在这个基础上我们可以创建一些图形数字字符之类的,但这个函数需要GD库支持,如果没有开启GD库使用时会提示Call to undefined function imagecreate()错误.

例,我在测试一个简单生成图形时实例,新建一个新的 GD 图像流并输出图像,代码如下:

<?php 
header("Content-type: image/png"); 
$im = @imagecreate(100, 50) 
	or die("Cannot Initialize new GD image stream"); 
$background_color = imagecolorallocate($im, 255, 255, 255); 
$text_color = imagecolorallocate($im, 233, 14, 91); 
imagestring($im, 1, 5, 5,  "A Simple Text String", $text_color); 
imagepng($im); 
imagedestroy($im);

运行机制时提示:Fatal error: Call to undefined function imagecreate() .....

后面突然想起没打开gd库了,这一问题是,ＧＤ库没有正确安装或配置.

解决方案:在php.ini中找到 ;extension=php_gd2.dll 去掉前边的;,然后将php目录中的ext下的php_gd2.dll拷入c:/windows/system32和c:/windows目录下,重启IIS或者apache就OK了.

centos中gd库开启,具体操作只有2个命令如下,运行在线安装带GD库的PHP的命令,代码如下:

yum -y install php-gd

重新启动apachce服务以使安装后的GD库生效,代码如下:

/etc/rc.d/init.d/httpd restart(service httpd restart)

gd的安装路径:

/etc/php.d/gd.ini  

/usr/lib/php/modules/gd.so

关于需要使用GD库的图形处理函数还有如下:

gd_info 
getimagesize 
getimagesizefromstring 
image_type_to_extension 
image_type_to_mime_type 
image2wbmp 
imageaffine 
imageaffinematrixconcat 
imageaffinematrixget 
imagealphablending 
imageantialias 
imagearc 
imagechar 
imagecharup 
imagecolorallocate 
imagecolorallocatealpha 
imagecolorat 
imagecolorclosest 
imagecolorclosestalpha 
imagecolorclosesthwb 
imagecolordeallocate 
imagecolorexact 
imagecolorexactalpha 
imagecolormatch 
imagecolorresolve 
imagecolorresolvealpha 
imagecolorset 
imagecolorsforindex 
imagecolorstotal 
imagecolortransparent 
imageconvolution 
imagecopy 
imagecopymerge 
imagecopymergegray 
imagecopyresampled 
imagecopyresized 
» imagecreate 
imagecreatefromgd2 
imagecreatefromgd2part 
imagecreatefromgd 
imagecreatefromgif 
imagecreatefromjpeg 
imagecreatefrompng 
imagecreatefromstring 
imagecreatefromwbmp 
imagecreatefromwebp 
imagecreatefromxbm 
imagecreatefromxpm 
imagecreatetruecolor 
imagecrop 
imagecropauto 
imagedashedline 
imagedestroy 
imageellipse 
imagefill 
imagefilledarc 
imagefilledellipse 
imagefilledpolygon 
imagefilledrectangle 
imagefilltoborder 
imagefilter 
imageflip 
imagefontheight 
imagefontwidth 
imageftbbox 
imagefttext 
imagegammacorrect 
imagegd2 
imagegd 
imagegif 
imagegrabscreen 
imagegrabwindow 
imageinterlace 
imageistruecolor 
imagejpeg 
imagelayereffect 
imageline 
imageloadfont 
imagepalettecopy 
imagepalettetotruecolor 
imagepng 
imagepolygon 
imagepsbbox 
imagepsencodefont 
imagepsextendfont 
imagepsfreefont 
imagepsloadfont 
imagepsslantfont 
imagepstext 
imagerectangle 
imagerotate 
imagesavealpha 
imagescale 
imagesetbrush 
imagesetinterpolation 
imagesetpixel 
imagesetstyle 
imagesetthickness 
imagesettile 
imagestring 
imagestringup 
imagesx 
imagesy 
imagetruecolortopalette 
imagettfbbox 
imagettftext 
imagetypes 
imagewbmp 
imagewebp 
imagexbm 
iptcembed 
iptcparse 
jpeg2wbmp 
png2wbmp

               
               

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