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 <---这个是让php支持gd的,这个是CentOS的特色之一,不用把全部东西都写在php.ini这个文件里,只是需要把*.ini文件写在/etc/php.d/文件夹就可以了,系统会自动把这个目录下的*.ini读入php.ini.
/usr/lib/php/modules/gd.so <----这个就是gd的文件.
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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