php教程|PHP源码
php
php教程-PHP源码
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1. [PHP]代码
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, $trnprt_indx);// Set the background color for new image to transparentimagecolortransparent($image_resized, $trnprt_indx); } // Always make a transparent background color for PNGs that don have one allocated already elseif ($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, $color); // Restore transparency blendingimagesavealpha($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; }
