Solving the problem of php batch image format conversion
最近要把项目中的图片全部生成webp格式, 过程整理一下, (直接存在本地,或者图片链接存在数据库都可以看看)
首先,肯定是批量处理, 一个php处理不了这么多, 会爆内存的, 个人建议用ajax循环调用php文件
下面贴ajax代码, 小白和我看看就行, 老人跳过
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>更换图片</title>
<script type="text/javascript" src="./jquery-1.8.3.min.js"></script>
</head>
<body>
<button id="but01">点我就帮你转图片</button>
</body>
<script type="text/javascript"> var limit = 50; //每次50条
var offset = 0; //偏移量,每次自增50
function toPhp(){
$.ajax({
url: "./sqlsrc.php", //后台处理程序
type: 'POST',
data: {limit: limit, offset: offset},
success:function(data)
{ if(data)
{
offset = offset + 50;
toPhp(); //根据后台返回的内容,继续调用自己
}else
{
alert('这里是limit---' + limit);
alert('这里是data---' + data);
alert('完成');
}
},
error:function()
{
alert('失败');
},
dataType:'text'
});
}
$("#but01").click(toPhp); // 点击按钮执行程序</script>
</html>下面是php处理文件, sqlsrc.php主要是处理那种图片路径存在数据库里的,
以下本人是把数据库的图片拉到本地同时生成webp格式/
你可以直接在项目所在的目录运行此脚本,
注意 sqlsrc.php中的地址要自己拼~
sqlsrc.php文件如下
<?php
ini_set ('gd.jpeg_ignore_warning', 1); //忽略
set_time_limit(0);//0表示不限时
$dsn='mysql:host=192.168.1.1;dbname=yourdbname';
$user='root';
$password='';
$status=1; //看个人需要了,这个参数
$data = $_POST;
try {
$sql='select thumbnail_pic,small_pic,big_pic from sdb_goods';
$sql .= " limit {$data['limit']} offset {$data['offset']}"; // 偏移分页查询/
$dbh=new PDO($dsn,$user,$password);
$dbh->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);
$stmt=$dbh->prepare($sql);
$stmt->bindParam(':status',$status); //绑定参数的样例, 喜欢参数绑定的看这里,其他人无视这行
$stmt->execute();
$flag = false; //这里设置一个标识,如果没走while函数, 那么flag依然为false
while ($row=$stmt->fetch(PDO::FETCH_ASSOC)) {
$flag = true; //只要有查询到的内容, flag就会true
$count = $data['count'];
$ptn = "/http.*?fs_storage/";
foreach ($row as $k=>$v){
preg_match_all($ptn,$v,$res);
if(empty($res[0]))
{
continue;
}
foreach ($res as $kk=>&$vv) //这层遍历不需要, 谁可以优化下贴上来.
{
$vv[0] = rtrim($vv[0],'fs_storage');//图片远程路径
$vv[0] = rtrim($vv[0],'|');//图片远程路径
$ptn01 = "/http.*?\|/";
$src = preg_replace($ptn01,'',$vv[0]); //远程路径标准版
if(empty($src))
{
continue;
}
//这里获取到表中图片的地址, 整理成本地的地址
$ptn02 = "/.*com/";
$local = preg_replace($ptn02,'.',$src); //本地路径
$ptn03 = "/:88/";
$local = preg_replace($ptn03,'',$local); //本地路径+文件名
$path = pathinfo($local,PATHINFO_DIRNAME);
if(empty($path))
{
continue;
}
if(!is_dir($path))
{
mkdir($path,777,true); //
}
//下面这行会报个warning, 忘了是啥, 直接抑制掉了
@$img = file_get_contents($src);
if (!$img)
{
continue;
}
file_put_contents($local,$img);
//根据数据库的地址下载图片到本地//
turnType($local);
//此行代码调用函数, 在文件夹中生成一个同名的webp图片;
//接着应该把地址存到数据库中
//拼接成你线上的url图片地址,然后存到数据库就行了
//但是没必要,名字都是一样的,只是后缀不一样
}
}
}
echo $flag;
$flag = false; //这行也是不需要的, 但是为了祭奠我的老师, 容许我放在这里占个位/
} catch (PDOException $e) {
echo 'SQL Query:'.$sql.'</br>';
echo 'Connection failed:'.$e->getMessage();
}
?>
sqlsrc关于上面这个文件,while中的代码, 主要是正则 拼接地址,这部分可以不看, 每个人的业务都不一样, 所以看了也白看, 直接看其他部分(gd库函数和最后的调用函数)
我这里是1次查50张图片, 然后遍历, 一张图片一张图片生成webp,效率非常不高///////////
pictest.php文件如下,(上个文件中有调用, )
单个图片生成webp
<?php
/*
** webp格式转换函数,
** 参数为具体的图片路径加上文件名,
** 例:D:\workspaces\upload\images\2017\demo.jpeg
*/
function turnType($file)
{
if(is_file($file))
{
//获取文件后缀名
$ext = pathinfo($file,PATHINFO_EXTENSION);;
//根据后缀名把jpg或者png转成webp
if($ext == 'jpeg' || $ext == 'jpg' || $ext == 'png')
{
//生成新的文件名
$newpic = rtrim($file,$ext).'webp';
if($ext == 'jpg' )
{
$ext = 'jpeg';
}
$funName = 'imagecreatefrom'.$ext; //拼接函数名imagecreatefromjpeg 还是 imagecreatefrompng
$hImg = $funName($file); //打开这个图片资源,
imagewebp($hImg,$newpic); //用这个图片资源创建一个webp图片, 存在路径$tdir
imagedestroy($hImg); //销毁画布资源
}
}
}
?>
单个文件生成webp单个文件生成webp
以上三个代码放在一个文件夹中/ 主要改第二个文件sqlsrc.php中拼接地址的部分(或者删除) ,图片直接在本地的...可以参考下面的代码,
怎么限制每次查询的数量没考虑, 谁有建议可以贴上来/
这里还有直接遍历整个目录, 然后批量生成webp格式的代码. 数据量小的可以参考下/;
<?php
$dir = '../images'; //这里设置目录, 会遍历整个目录,然后生成一个webp格式的图片/ 数量太大会超内存,有需要的可以参考imgtype($dir);//这里调用函数
//格式转换函数function jpgturn ($sdir,$tdir,$ext)
{ if($ext == 'jpeg' || $ext == 'jpg')
{ $hImg = imagecreatefromjpeg($sdir);
} if($ext == 'png' || $ext == 'PNG')
{ $hImg = imagecreatefrompng($sdir);
}
imagewebp($hImg,$tdir);
imagedestroy($hImg);
}// 自定义函数---获取后缀名;function get_extension($file)
{ return pathinfo($file,PATHINFO_EXTENSION);
}// 遍历目录, 递归调用, 拼接新文件名, 然后调用格式转换函数function imgtype ($dir)
{ $dir = rtrim($dir,'/').'/'; $hd = opendir($dir); //
while($hf=readdir($hd)) // { if($hf=='.'||$hf=='..')
{ continue;
} if(is_file($dir.$hf))
{ //获取文件后缀名的自定义函数
$ext = get_extension($dir.$hf);
//根据后缀名把jpg转成webp
if($ext == 'jpeg' || $ext == 'jpg' || $ext == 'png' || $ext == 'PNG')
{ //生成新的文件名
$new = rtrim($dir.$hf,$ext); $new .= 'webp';
jpgturn($dir.$hf,$new,$ext);
}
}if(is_dir($dir.$hf))//递归调用 {
imgtype($dir.$hf);
}
}
}?>The above is the detailed content of Solving the problem of php batch image format conversion. For more information, please follow other related articles on the PHP Chinese website!
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