ThinkPHP 遇到Call to undefined function ImageCreateFrombmp() 问题解决

ThinkPHP 遇到Call to undefined function ImageCreateFrombmp() 问题解决

今天在使用Thinkphp处理图片相关的问题，始终都在报错，如下提示：

Fatal error: Call to undefined function ImageCreateFrombmp() on xxx Line;

1.检测Gd库是否安装好

刚开始以为是Gd库没有安装，但是在php.ini 中，发现Gd库已经是配置好了的，于是继续看源码，在 Gd.class.php 文件的 open() 方法中的 63行 ，如下 ：

//打开图像if('gif' == $this->info['type']){    $class  =    'Think\\Image\\Driver\\GIF';    $this->gif = new $class($imgname);    $this->img = imagecreatefromstring($this->gif->image());} else {    $fun = "imagecreatefrom{$this->info['type']}"; //这里使用了ImageCreateFrombmp() 函数    $this->img = $fun($imgname);}

2.在官方社区搜索答案

在网上找了一下解决方案，于 www.thinkphp.cn/topic/5869.html（传送门点击查看） 中搜索到相同的问题，我将解决方案贴在下方：

大部分代码来源于互联网,但是一般不支持32位的BMP图片.
小生稍微修改了一点点,使其支持32位的bmp图片.

最简单的方法就是自己写个imagecreatefrombmp方法，参考 www.oschina.net/code/snippet_157781_12817(传送门点击查看)

将以下代码放到公共函数文件中 （Common/Common/function.php）即可,以下是代码：

/** * BMP 创建函数 * @author simon * @param string $filename path of bmp file * @example who use,who knows * @return resource of GD */function imagecreatefrombmp( $filename ){    if ( !$f1 = fopen( $filename, "rb" ) )        return FALSE;    $FILE = unpack( "vfile_type/Vfile_size/Vreserved/Vbitmap_offset", fread( $f1, 14 ) );    if ( $FILE['file_type'] != 19778 )        return FALSE;    $BMP = unpack( 'Vheader_size/Vwidth/Vheight/vplanes/vbits_per_pixel' . '/Vcompression/Vsize_bitmap/Vhoriz_resolution' . '/Vvert_resolution/Vcolors_used/Vcolors_important', fread( $f1, 40 ) );    $BMP['colors'] = pow( 2, $BMP['bits_per_pixel'] );    if ( $BMP['size_bitmap'] == 0 )        $BMP['size_bitmap'] = $FILE['file_size'] - $FILE['bitmap_offset'];    $BMP['bytes_per_pixel'] = $BMP['bits_per_pixel'] / 8;    $BMP['bytes_per_pixel2'] = ceil( $BMP['bytes_per_pixel'] );    $BMP['decal'] = ($BMP['width'] * $BMP['bytes_per_pixel'] / 4);    $BMP['decal'] -= floor( $BMP['width'] * $BMP['bytes_per_pixel'] / 4 );    $BMP['decal'] = 4 - (4 * $BMP['decal']);    if ( $BMP['decal'] == 4 )        $BMP['decal'] = 0;    $PALETTE = array();    if ( $BMP['colors'] < 16777216 ){        $PALETTE = unpack( 'V' . $BMP['colors'], fread( $f1, $BMP['colors'] * 4 ) );    }    $IMG = fread( $f1, $BMP['size_bitmap'] );    $VIDE = chr( 0 );    $res = imagecreatetruecolor( $BMP['width'], $BMP['height'] );    $P = 0;    $Y = $BMP['height'] - 1;    while( $Y >= 0 ){        $X = 0;        while( $X < $BMP['width'] ){            if ( $BMP['bits_per_pixel'] == 32 ){                $COLOR = unpack( "V", substr( $IMG, $P, 3 ) );                $B = ord(substr($IMG, $P,1));                $G = ord(substr($IMG, $P+1,1));                $R = ord(substr($IMG, $P+2,1));                $color = imagecolorexact( $res, $R, $G, $B );                if ( $color == -1 )                    $color = imagecolorallocate( $res, $R, $G, $B );                $COLOR[0] = $R*256*256+$G*256+$B;                $COLOR[1] = $color;            }elseif ( $BMP['bits_per_pixel'] == 24 )                $COLOR = unpack( "V", substr( $IMG, $P, 3 ) . $VIDE );            elseif ( $BMP['bits_per_pixel'] == 16 ){                $COLOR = unpack( "n", substr( $IMG, $P, 2 ) );                $COLOR[1] = $PALETTE[$COLOR[1] + 1];            }elseif ( $BMP['bits_per_pixel'] == 8 ){                $COLOR = unpack( "n", $VIDE . substr( $IMG, $P, 1 ) );                $COLOR[1] = $PALETTE[$COLOR[1] + 1];            }elseif ( $BMP['bits_per_pixel'] == 4 ){                $COLOR = unpack( "n", $VIDE . substr( $IMG, floor( $P ), 1 ) );                if ( ($P * 2) % 2 == 0 )                    $COLOR[1] = ($COLOR[1] >> 4);                else                    $COLOR[1] = ($COLOR[1] & 0x0F);                $COLOR[1] = $PALETTE[$COLOR[1] + 1];            }elseif ( $BMP['bits_per_pixel'] == 1 ){                $COLOR = unpack( "n", $VIDE . substr( $IMG, floor( $P ), 1 ) );                if ( ($P * 8) % 8 == 0 )                    $COLOR[1] = $COLOR[1] >> 7;                elseif ( ($P * 8) % 8 == 1 )                    $COLOR[1] = ($COLOR[1] & 0x40) >> 6;                elseif ( ($P * 8) % 8 == 2 )                    $COLOR[1] = ($COLOR[1] & 0x20) >> 5;                elseif ( ($P * 8) % 8 == 3 )                    $COLOR[1] = ($COLOR[1] & 0x10) >> 4;                elseif ( ($P * 8) % 8 == 4 )                    $COLOR[1] = ($COLOR[1] & 0x8) >> 3;                elseif ( ($P * 8) % 8 == 5 )                    $COLOR[1] = ($COLOR[1] & 0x4) >> 2;                elseif ( ($P * 8) % 8 == 6 )                    $COLOR[1] = ($COLOR[1] & 0x2) >> 1;                elseif ( ($P * 8) % 8 == 7 )                    $COLOR[1] = ($COLOR[1] & 0x1);                $COLOR[1] = $PALETTE[$COLOR[1] + 1];            }else                return FALSE;            imagesetpixel( $res, $X, $Y, $COLOR[1] );            $X++;            $P += $BMP['bytes_per_pixel'];        }        $Y--;        $P += $BMP['decal'];    }    fclose( $f1 );    return $res;}

特别感谢 simon、thinkphphj的贡献！