It took me long time to create an universal function which would create thumbnails from pictures and suit all my needs.
The base for this function, I took from here.
But I modified it slightly.
function createthumb($name, $newname, $new_w, $new_h, $by_small=true, $border=false, $transparency=true, $base64=false) { if(file_exists($newname)) @unlink($newname); if(!file_exists($name)) return false; $arr = split("\.",$name); $ext = $arr[count($arr)-1]; if(preg_match('/jpeg/i', $ext)){ $img = @imagecreatefromjpeg($name); }elseif (preg_match('/jpg/i', $ext)){ $img = @imagecreatefromjpeg($name); } elseif(preg_match('/png/i', $ext)){ $img = @imagecreatefrompng($name); } elseif(preg_match('/gif/i', $ext)) { $img = @imagecreatefromgif($name); } if(!$img) return false; $old_x = imageSX($img); $old_y = imageSY($img); if($old_x < $new_w && $old_y < $new_h) { $thumb_w = $old_x; $thumb_h = $old_y; } elseif ($old_x < $old_y) { if ($by_small) { $thumb_w = $new_w; $thumb_h = floor(($old_y*($new_h/$old_x))); }else{ $thumb_w = floor($old_x*($new_w/$old_y)); $thumb_h = $new_h; } } elseif ($old_x > $old_y) { if ($by_small) { $thumb_w = floor($old_x*($new_w/$old_y)); $thumb_h = $new_h; } } elseif ($old_x == $old_y) { $thumb_w = $new_w; $thumb_h = $new_h; } $thumb_w = ($thumb_w<1) ? 1 : $thumb_w; $thumb_h = ($thumb_h<1) ? 1 : $thumb_h; $new_img = ImageCreateTrueColor($thumb_w, $thumb_h); if($transparency) { if(preg_match('/png/i', $ext)) { imagealphablending($new_img, false); $colorTransparent = imagecolorallocatealpha($new_img, 0, 0, 0, 127); imagefill($new_img, 0, 0, $colorTransparent); imagesavealpha($new_img, true); } elseif(preg_match('/gif/i', $ext)) { $trnprt_indx = imagecolortransparent($img); if ($trnprt_indx >= 0) { //its transparent $trnprt_color = imagecolorsforindex($img, $trnprt_indx); $trnprt_indx = imagecolorallocate($new_img, $trnprt_color['red'], $trnprt_color['green'], $trnprt_color['blue']); imagefill($new_img, 0, 0, $trnprt_indx); imagecolortransparent($new_img, $trnprt_indx); } } } else { Imagefill($new_img, 0, 0, imagecolorallocate($new_img, 255, 255, 255)); } imagecopyresampled($new_img, $img, 0,0,0,0, $thumb_w, $thumb_h, $old_x, $old_y); if($border) { $black = imagecolorallocate($new_img, 0, 0, 0); imagerectangle($new_img,0,0, $thumb_w, $thumb_h, $black); } if($base64) { ob_start(); imagepng($new_img); $img = ob_get_contents(); ob_end_clean(); $return = base64_encode($img); } else { if(preg_match('/jpeg/i', $ext)) { imagejpeg($new_img, $newname); $return = true; } elseif( preg_match('/jpg/i', $ext)){ imagejpeg($new_img, $newname); $return = true; } elseif(preg_match('/png/i', $ext)){ imagepng($new_img, $newname); $return = true; } elseif(preg_match('/gif/i', $ext)) { imagegif($new_img, $newname); $return = true; } } imagedestroy($new_img); imagedestroy($img); return $return; }
So, if you want to create a thumbnail, so that the thumbnail size will be base on smallest side, then do the following:
createthumb($targetFile_big,$targetFile, 170, 170);
In this case the smallest part will become 170px and the biggest proportionally bigger. Otherwise:
createthumb($targetFile_big,$targetFile, 170, 170, false);
In this case the biggest part will become 170px and the smallest proportionally less.
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