最近正在弄着缩略图玩意，和大家分享两个方法
$source_path:原图的路径
$NewImagePath:生成缩略图路径
$target_width:缩略图宽度
$target_height:缩略图高度<?php
function getCropper($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 / $target_width;
// 源图过高
if ($source_ratio > $target_ratio)
{
$cropped_width = $source_width;
$cropped_height = $source_width * $target_ratio;
$source_x = 0;
$source_y = ($source_height - $cropped_height) / 2;
}
// 源图过宽
elseif ($source_ratio < $target_ratio)
{
$cropped_width = $source_height / $target_ratio;
$cropped_height = $source_height;
$source_x = ($source_width - $cropped_width) / 2;
$source_y = 0;
}
// 源图适中
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, $cropped_height);
// 图片裁剪
imagecopy($cropped_image, $source_image, 0, 0, $source_x, $source_y, $cropped_width, $cropped_height);
// 图片缩放
imagecopyresampled($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);
}
以下方法是生成缩略图，填充白边的方法<?php
//生成缩略图，填充白边
function getCrops($src_path,$NewImagePath,$width,$height){
//源图对象
$src_image = imagecreatefromstring(file_get_contents($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;
}
//生成等比例的缩略图
//$tmp_image_width = 0;
//$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);
//添加白边
$final_image = imagecreatetruecolor($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, $tmp_image_height);
//输出图片
header('Content-Type: image/jpeg');
imagejpeg($final_image,$NewImagePath,100);
imagedestroy($src_image);
imagedestroy($final_image);
}
以上就是(实用篇)PHP生成缩略图的方法实例的内容，更多相关内容请关注PHP中文网()！
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