php 安装imagemagick、MagickWand 有关问题 急

php 安装imagemagick、MagickWand 问题 急~~
在网上下了一个 php-5.2.4_magickwand_q16_st.dll 把他放到了PHP根目录的 ext目录下 windows文件夹里的php.ini也增加了extension=php-5.2.4_magickwand_q16_st.dll 运行 phpinfo(); ?> 可以看到 


magickwand
MagickWand Backend Library ImageMagick 
MagickWand Extension Version 1.0.5  
ImageMagick support enabled  
ImageMagick version ImageMagick 6.3.5 09/21/07 Q16 http://www.imagemagick.org  
ImageMagick QuantumRange (MaxRGB) 65535  
MagickWand supported image formats A, ART, AVI, AVS, B, BIE, BMP, BMP2, BMP3, C, CAPTION, CIN, CIP, CLIP, CLIPBOARD, CMYK, CMYKA, CR2, CRW, CUR, CUT, DCM, DCR, DCX, DFONT, DNG, DPS, DPX, EMF, EPDF, EPI, EPS, EPS2, EPS3, EPSF, EPSI, EPT, EPT2, EPT3, EXR, FAX, FITS, FRACTAL, FTS, G, G3, GIF, GIF87, GRADIENT, GRAY, HISTOGRAM, HTM, HTML, ICB, ICO, ICON, INFO, IPL, JBG, JBIG, JNG, JP2, JPC, JPEG, JPG, JPX, K, LABEL, M, M2V, MAP, MAT, MATTE, MIFF, MNG, MONO, MPC, MPEG, MPG, MRW, MSL, MSVG, MTV, MVG, NEF, NULL, O, ORF, OTB, OTF, PAL, PALM, PAM, PATTERN, PBM, PCD, PCDS, PCL, PCT, PCX, PDB, PDF, PEF, PFA, PFB, PFM, PGM, PGX, PICON, PICT, PIX, PJPEG, PLASMA, PNG, PNG24, PNG32, PNG8, PNM, PPM, PREVIEW, PS, PS2, PS3, PSD, PTIF, PWP, R, RAF, RAS, RGB, RGBA, RGBO, RLA, RLE, SCR, SCT, SFW, SGI, SHTML, STEGANO, SUN, SVG, SVGZ, TEXT, TGA, THUMBNAIL, TIFF, TIFF64, TILE, TIM, TTC, TTF, TXT, UIL, UYVY, VDA, VICAR, VID, VIFF, VST, WBMP, WMF, WMFWIN32, WMZ, WPG, X, X3F, XBM, XC, XCF, XPM, XV, XWD, Y, YCbCr, YCbCrA, YUV  



图



但是运行 


$handle=imagick_readimage("3.gif");
$image_width = imagick_getwidth($handle);
imagick_destroyhandle($handle);
echo "$image_width";
?>

便会出现 

Fatal error: Call to undefined function imagick_readimage() in C:\AppServ\www\t.php on line 2

错误，请问这个是怎么回事？

imagemagick 是不是安装成功了，要是安装成功了 为什么会找不到函数呢？

急 中。。。

------解决方案--------------------
先执行
print_r(get_extension_funcs('magickwand'));
看看都有哪些函数可用