在做PHPExcel导入功能时，调用 vendor\topthink\think-image\src\Image.php 类打开图片，图片报错说找不到 imagecreatefrombmp方法，查看了一下Image源码，发现是调用一个公共方法，这个方法也确实不存在
方案1
检查Gd库是否安装成功，如果没有安装就安装，安装成功后再次执行，如果不报错就解决问题，如果再次报错，就用以下另外两种方案。
方案2
在公共文件创建公共函数：
/**
* 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;
}方案3
这个方案是我自己捣鼓，代码美化程度不如方案2，可供参考：
复制一个bmp图片到临时文件夹，然后通过程序将bmp转为jpg，同时删除bmp图片，性能和代码结构来说都不算好，但能解决问题
// 使用
$file = new File($temp_path);
if($file->getExtension() == 'bmp') {
$bmp_path = $temp_path;
$temp_path = changeBMPtoJPG($temp_path);
unlink($bmp_path);
}
/**
* bmp图片转为jpg图片
*
* @param string $srcPathName
* @return void
*/
function changeBMPtoJPG($srcPathName){
$srcFile=$srcPathName;
$dstFile = str_replace('.bmp', '.jpg', $srcPathName);
$photoSize = GetImageSize($srcFile);
$pw = $photoSize[0];
$ph = $photoSize[1];
$dstImage = ImageCreateTrueColor($pw, $ph);
$white = imagecolorallocate($dstImage, 255, 255, 255);
//用 $white 颜色填充图像
imagefill( $dstImage, 0, 0, $white);
//读取图片
$srcImage = ImageCreateFromBMP_private($srcFile);
//合拼图片
imagecopyresampled($dstImage, $srcImage, 0, 0, 0, 0, $pw, $ph, $pw, $ph);
$judge = imagejpeg($dstImage, $dstFile, 90);
imagedestroy($dstImage);
if($judge){
return $dstFile;
}else{
return false;
}
}
/**
* bmp图片转为jpg图片
*
* @param string $srcPathName
* @return void
*/
function ImageCreateFromBMP_private($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 < $BMP['width']) {
switch ($BMP['bits_per_pixel']) {
case 32:
$COLOR = unpack("V", substr($IMG, $P, 3) . $VIDE);
break;
case 24:
$COLOR = unpack("V", substr($IMG, $P, 3) . $VIDE);
break;
case 16:
$COLOR = unpack("n", substr($IMG, $P, 2));
$COLOR[1] = $PALETTE[$COLOR[1] + 1];
break;
case 8:
$COLOR = unpack("n", $VIDE . substr($IMG, $P, 1));
$COLOR[1] = $PALETTE[$COLOR[1] + 1];
break;
case 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];
break;
case 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];
break;
default:
return false;
break;
}
imagesetpixel($res, $X, $Y, $COLOR[1]);
$X++;
$P += $BMP['bytes_per_pixel'];
}
$Y--;
$P+=$BMP['decal'];
}
fclose($f1);
return $res;
}