（實用篇）PHP產生縮圖的方法執行個體

最近正在弄著縮圖玩意，和大家分享兩個方法

$source_path:原圖的路徑

$NewImagePath:產生縮圖路徑

$target_width:縮圖寬度

$target_height:縮圖高度

<?php    function getCropper($source_path,$NewImagePath, $target_width, $target_height)    {        $source_info   = getimagesize($source_path);        $source_width  = $source_info[0];        $source_height = $source_info[1];        $source_mime   = $source_info['mime'];        $source_ratio  = $source_height / $source_width;        $target_ratio  = $target_height / $target_width;        // 源圖過高        if ($source_ratio > $target_ratio)        {            $cropped_width  = $source_width;            $cropped_height = $source_width * $target_ratio;            $source_x = 0;            $source_y = ($source_height - $cropped_height) / 2;        }        // 源圖過寬        elseif ($source_ratio < $target_ratio)        {            $cropped_width  = $source_height / $target_ratio;            $cropped_height = $source_height;            $source_x = ($source_width - $cropped_width) / 2;            $source_y = 0;        }        // 源圖適中        else        {            $cropped_width  = $source_width;            $cropped_height = $source_height;            $source_x = 0;            $source_y = 0;        }        switch ($source_mime)        {            case 'image/gif':                $source_image = imagecreatefromgif($source_path);                break;            case 'image/jpeg':                $source_image = imagecreatefromjpeg($source_path);                break;            case 'image/png':                $source_image = imagecreatefrompng($source_path);                break;            default:                return false;                break;        }        $target_image  = imagecreatetruecolor($target_width, $target_height);        $cropped_image = imagecreatetruecolor($cropped_width, $cropped_height);        // 圖片裁剪        imagecopy($cropped_image, $source_image, 0, 0, $source_x, $source_y, $cropped_width, $cropped_height);        // 圖片縮放        imagecopyresampled($target_image, $cropped_image, 0, 0, 0, 0, $target_width, $target_height, $cropped_width, $cropped_height);        header('Content-Type: image/jpeg');        imagejpeg($target_image,$NewImagePath,100);        imagedestroy($source_image);        imagedestroy($target_image);        imagedestroy($cropped_image);            }

以下方法是產生縮圖，填充白邊的方法

<?php//產生縮圖，填充白邊    function getCrops($src_path,$NewImagePath,$width,$height){        //源圖對象        $src_image = imagecreatefromstring(file_get_contents($src_path));        $source_info   = getimagesize($src_path);        $source_mime   = $source_info['mime'];        $src_width = imagesx($src_image);        $src_height = imagesy($src_image);        switch ($source_mime)        {            case 'image/gif':                $src_image = imagecreatefromgif($src_path);                break;            case 'image/jpeg':                $src_image = imagecreatefromjpeg($src_path);                break;            case 'image/png':                $src_image = imagecreatefrompng($src_path);                break;            default:                return false;                break;        }        //產生等比例的縮圖        //$tmp_image_width = 0;        //$tmp_image_height = 0;        if ($src_width / $src_height >= $width / $height) {            $tmp_image_width = $width;            $tmp_image_height = round($tmp_image_width * $src_height / $src_width);        } else {            $tmp_image_height = $height;            $tmp_image_width = round($tmp_image_height * $src_width / $src_height);        }        $tmpImage = imagecreatetruecolor($tmp_image_width, $tmp_image_height);        imagecopyresampled($tmpImage, $src_image, 0, 0, 0, 0, $tmp_image_width, $tmp_image_height, $src_width, $src_height);        //添加白邊        $final_image = imagecreatetruecolor($width, $height);        $color = imagecolorallocate($final_image, 255, 255, 255);        imagefill($final_image, 0, 0, $color);        $x = round(($width - $tmp_image_width) / 2);        $y = round(($height - $tmp_image_height) / 2);        imagecopy($final_image, $tmpImage, $x, $y, 0, 0, $tmp_image_width, $tmp_image_height);        //輸出圖片        header('Content-Type: image/jpeg');        imagejpeg($final_image,$NewImagePath,100);        imagedestroy($src_image);        imagedestroy($final_image);    }

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