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PHP,png,缩放,png图片
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PHP实现对png图像进行缩放的方法(支持透明背景)，png缩放
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本文实例讲述了PHP实现对png图像进行缩放的方法。分享给大家供大家参考。具体实现方法如下：
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function smart_resize_image( $file, $width = 0, $height = 0, $proportional = false, $output = file, $delete_original = true, $use_linux_commands = false ){ if ( $height <= 0 && $width <= 0 ) {return false; } $info = getimagesize($file); $image = \; $final_width = 0; $final_height = 0; list($width_old, $height_old) = $info; if ($proportional) {if ($width == 0) $factor = $height/$height_old;elseif ($height == 0) $factor = $width/$width_old;else $factor = min ( $width / $width_old, $height / $height_old); $final_width = round ($width_old * $factor);$final_height = round ($height_old * $factor); } else {$final_width = ( $width <= 0 ) ? $width_old : $width;$final_height = ( $height = 0) { // Get the original images transparent colors RGB values $trnprt_color = imagecolorsforindex($image, $trnprt_indx); // Allocate the same color in the new image resource $trnprt_indx = imagecolorallocate($image_resized, $trnprt_color[ ed], $trnprt_color[green], $trnprt_color[lue]); // Completely fill the background of the new image with allocated color. imagefill($image_resized, 0, 0, $trnprt_indx); // Set the background color for new image to transparent imagecolortransparent($image_resized, $trnprt_indx);}// Always make a transparent background color for PNGs that don have one allocated alreadyelseif ($info[2] == IMAGETYPE_PNG) { // Turn off transparency blending (temporarily) imagealphablending($image_resized, false); // Create a new transparent color for image $color = imagecolorallocatealpha($image_resized, 0, 0, 0, 127); // Completely fill the background of the new image with allocated color. imagefill($image_resized, 0, 0, $color); // Restore transparency blending imagesavealpha($image_resized, true);} } imagecopyresampled($image_resized, $image, 0, 0, 0, 0, $final_width, $final_height, $width_old, $height_old); if ( $delete_original ) {if ( $use_linux_commands ) exec( m .$file);else @unlink($file); } switch ( strtolower($output) ) {case rowser: $mime = image_type_to_mime_type($info[2]); header("Content-type: $mime"); $output = NULL;break;case file: $output = $file;break;case eturn: return $image_resized;break;default:break; } switch ($info[2] ) {case IMAGETYPE_GIF: imagegif($image_resized, $output);break;case IMAGETYPE_JPEG: imagejpeg($image_resized, $output);break;case IMAGETYPE_PNG: imagepng($image_resized, $output);break;default: return false; } return true;}
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