Php prompts Fatal error: Call to undefined function imagecreate ()

For example, when I test a simple graph generation instance

Example #1 create a new GD image stream and output the image

The code is as follows:

<? Php
Header ("Content-type: image/png ");
$ Im = @ imagecreate (100, 50)
Or die ("Cannot Initialize new GD image stream ");
$ Background_color = imagecolorallocate ($ instant, 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 );
?>

Prompt during running mechanism

Fatal error: Call to undefined function imagecreate ().....

I suddenly remembered that the gd database was not opened.

The problem is that the GD library is not correctly installed or configured. Solution:

In php. ini, find
; Extension = php_gd2.dll
Remove the front edge;
Then, import the php_gd2.dll under ext in the php directory to the c:/windows/system32 and c:/windows directories, and restart IIS or apache.

Enable gd Library in centos

The specific operation only has two commands:
Run the following command to install PHP with GD Library online:

The code is as follows:

Yum-y install php-gd

Restart the apachce service to make the installed GD library take effect.

The code is as follows:

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

/Etc/php. d/gd. ini <--- This is to allow php to support gd. This is one of the characteristics of CentOS and does not need to write everything in php. in the ini file, you just need to set *. the INI file is written in/etc/php. d/Folder. The system will automatically put *. ini is read into php. ini
Gd installation path

/Usr/lib/php/modules/gd. so <---- this is the gd file.

The graph processing functions that require using the GD library are as follows:

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
 
& Raquo; 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
 
20172wbmp
 
Png2wbmp