PHP convert BMP image format to JPG format

Before the image format conversion, the output phpinfo () to view the PHP library information, to see if the GD extension Library is open, if not opened, opened the php.ini file, Use the Find tool to find Extension=php_gd2.dll, Extension=php_ Gd2.dll the ";" in front of you.

Here the conversion to JPG format is required for JPEG support, PNG supports PNG support, corresponding to check the format of the first to support

Imagejpeg () function failure may be your folder permissions problem, pay more attention to

You can use the Function_exist () function imagecreatefrombmp to check for presence, imagecreatefrombmp_private in the following example is used instead of the Imagecreatefrombmp method

The sample code is as follows:

<?PHP$srcFile= ' test.bmp ';//images that need to be converted$info=getimagesize($srcFile); $srcFileExt=$info[' MIME '];//determine if it is a BMP formatif($srcFileExt= = ' Image/x-ms-bmp '){    $result= Changebmptojpg ($srcFile); if($result){        Echo $result; }Else{        Echo"Conversion failed!"; }}Else{    Echo"The picture is not in BMP format";} Exit;functionImagecreatefrombmp_private ($filename) {    if(!$f 1=fopen($filename, "RB"))        return false; $FILE=Unpack("Vfile_type/vfile_size/vreserved/vbitmap_offset",fread($f 1, 14)); if($FILE[' File_type ']! = 19778)        return false; $BMP=Unpack(' Vheader_size/vwidth/vheight/vplanes/vbits_per_pixel '.        '/vcompression/vsize_bitmap/vhoriz_resolution '. '/vvert_resolution/vcolors_used/vcolors_important ',fread($f 1, 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($f 1,$BMP[' Colors '] * 4)); }    $IMG=fread($f 1,$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 ']) {                 Case32:$COLOR=Unpack("V",substr($IMG,$P, 3).$VIDE);  Break;  Case24:$COLOR=Unpack("V",substr($IMG,$P, 3).$VIDE);  Break;  Case16:$COLOR=Unpack("N",substr($IMG,$P, 2)); $COLOR[1] =$PALETTE[$COLOR[1] + 1];  Break;  Case8:$COLOR=Unpack("N",$VIDE.substr($IMG,$P, 1)); $COLOR[1] =$PALETTE[$COLOR[1] + 1];  Break;  Case4:$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[$COLOR[1] + 1];  Break;  Case1:$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($f 1); return $res;}functionChangebmptojpg ($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); //fill an image with $white colorImagefill ($dstImage, 0, 0,$white); //Reading Pictures    $srcImage= Imagecreatefrombmp_private ($srcFile); //co-collage pictureimagecopyresampled ($dstImage,$srcImage, 0, 0, 0, 0,$PW,$ph,$PW,$ph); $judge= Imagejpeg ($dstImage,$dstFile, 90); Imagedestroy ($dstImage); if($judge){        return $dstFile; }Else{        return false; }}?>

PHP convert BMP image format to JPG format