PHP生成縮略圖的方法

時間：2025-10-25 14:12:45 php語言

PHP生成縮略圖的方法

　　PHP語法吸收了C語言、Java和Perl的特點，利于學習，使用廣泛，以下是為大家分享的PHP生成縮略圖的方法，供大家參考借鑒，歡迎瀏覽!

　　<?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;

　　/pic/p>

　　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;

　　}

　　/pic/p>

　　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;

　　}

　　/pic/p>

　　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);

　　/pic/p>

　　imagecopy($cropped_image, $source_image, 0, 0, $source_x, $source_y, $cropped_width, $cropped_height);

　　/pic/p>

　　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);

　　}

　　以下方法是生成縮略圖，填充白邊的方法

　　<?php

　　/pic/p>

　　function getCrops($src_path,$NewImagePath,$width,$height){

　　/pic/p>

　　$src_image = imagecreatefromstring(file_get_contents($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;

　　}

　　/pic/p>

　　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);

　　/pic/p>

　　$final_image = imagecreatetruecolor($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);

　　/pic/p>

　　header('Content-Type: image/jpeg');

　　imagejpeg($final_image,$NewImagePath,100);

　　imagedestroy($src_image);

　　imagedestroy($final_image);

　　}

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