How to process images using php and ajax together (code)-PHP Tutorial-php.cn

How to process images using php and ajax together (code)

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Release： 2023-04-03 14:46:01

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This article introduces to you the characteristics and usage of Trait in PHP (with code). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

1. Process and save the base64-encoded image and return the saved image URL (can be used to process and save the image converted by CANVAS)
2. Process the image and return the base64-encoded image (generally solved JS cross-domain issues)

demo code (please use the server environment for testing: localhost):

<!DOCTYPE>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>test</title>
</head>
 
<body>
 
 
 
 
<div>1、处理保存 base64编码 的图片，并返回保存的图片URL</div>
<img id="get_imgUrl" src="" />
<div>2、处理图片，并返回 base64编码 的图片</div>
<img id="get_base64" src="" />
 
<script type="text/javascript" src="https://cdn.bootcss.com/jquery/1.11.2/jquery.min.js"></script>
<script type="text/javascript">
//1、处理保存 base64编码 的图片，并返回保存的图片URL
function getNewImgUrl(){
//    var new_img_src = mycanvas.toDataURL("image/jpg");
    var new_img_src = &#39;data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACgAAAAoCAMAAAC7IEhfAAAAzFBMVEUAAAD///////////////////////////////////////////////////////////////////////////////////////////////////////////////////8slq////8fkKoolK4qla7q9fcikasVi6fs9vhkssVgsMMlk60bjqliscTp9Pfe7/P7/f6Fw9GXy9jV6u/R6e5Np7vv9/m53OWr1eBYrcA4nLRJpLr1+vzj8vVut8nF4ukKhaKAwM9er8L3+/3W6/B/v8+BkGs6AAAAHnRSTlMAA2QdWCLjy/bu68iSe3heH/h1CucH8s6fnZuajswXGpFAAAACYElEQVQ4y42V2XriMAyFnQBlX1qg+0QOsUNMkgIJFChQaOf932nkLDN2CP1Gd5gfS+dYEkSLYaX/0h41GqP2S78yJNei0m+DEu1+pRSr9ZoA8OaE31H0HTpvANDs1S656g0AhOv5ZitmM7HdzNchHtxUi9ydxBYx51RMLGsiKOfxQqJ3Gma84tF7zClCeUwoj9/x+NVQuA4WN7epVQhqz7HUjqHm/Zh+IlcMQQ8fSvZqA7nD0bOLnM2YJBuZohrqnX8eIfBE4b5ztGB0jtpTl7qow6ZegCRTxbBzAEsmbFTUTd6jCfuYWsIPwPHo3/TJTx0sh8Z7aMo3MgEWXCbyXXD9mZ1xs+SjLIYvAExCxm3Y7xLBzHfAnSKZc47PEpN2e2gbpAKw5pPU4WlGIjdFbkrTc74GqJA+Ws2z8vOvJzS5PH8njrb3yTMEm9xqvGiFAhhDHausCAy6CeCZ1CHcCksnPUflLLENoU5asFTcs5OkUge1FUeX0CK3EHFLtdlzAVzNeotHcHsBUgSl80Xw/1MXxbipGNfXxfwiT2X2yGt1e56IWWr41JWkYrhJBtef0FeecECMerEp1CLypqgbRObW2kyTlbYZZk4bN9xR5BwItMaVB0njhti4P46CL0fBFvkokNoI4FQ6XN4Sh+u3HK5/4+ofjuefx1VGD2Dlly0Amx5WAD1tpXydxAVJxelLWylk3EmXlIZmS6ozJmr0krW345yla49xvkvWXu/6ImVIX1+k6FL3Xq7mIFxG0TIM5Gq+79ZISRgDsw5K1M2BQa7EcGA+PrQAWg+P5kD/+/gDFJSp26C1IkoAAAAASUVORK5CYII=&#39;;
    dataImg = new_img_src.substring(22);
    $.ajax({
            type:&#39;post&#39;,
            url:&#39;filesave.php&#39;,
            data:{dataimg:dataImg,datatype:&#39;get_imgUrl&#39;},
            beforeSend:function(){
            },success:function(str){
                $(&#39;#get_imgUrl&#39;).attr(&#39;src&#39;, str);
            }
    });
}
getNewImgUrl();
 
 
//////////////////////////////////////////////////////////////////////
 
 
//2、处理图片，并返回 base64编码 的图片
getBase64Img(&#39;http://qr.topscan.com/api.php?&w=100&m=10&fg=E60012&bg=E3CFB3&text=&#39; + encodeURIComponent(&#39;https://blog.csdn.net/&#39;) , function(data){
//    base64img = new Image();
//    base64img.src = data;
    $(&#39;#get_base64&#39;).attr(&#39;src&#39;, data);
});
function getBase64Img (sourceImgUrl , callback){
//    var sourceImgUrl = &#39;http://qr.topscan.com/api.php?&w=200&m=0&fg=E60012&bg=E3CFB3&text=&#39; + encodeURIComponent(&#39;https://blog.csdn.net/&#39;);
    $.ajax({
            type:&#39;post&#39;,
            url:&#39;filesave.php&#39;,
            data:{dataimg:sourceImgUrl,datatype:&#39;get_base64&#39;},
            beforeSend:function(){
            },success:function(str){
                callback(str);
            }
    });
}
</script>
 
 
 
 
</body>
</html>

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filesave.php code:

<?php
function rndStr(){
    $string = &#39;0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ&#39;;
    $len = rand(0,3)+5;
    $rst = &#39;&#39;;
    $strl = strlen($string);
    for($i=0;$i<$len;$i++){
        $ind = rand(0, $strl);
        $s = $string[$ind];
        $rst .= $s;
    }
    return $rst;
}

//要处理的类型
$type = $_POST[&#39;datatype&#39;];
//要处理的图片（正常url图片 / base64编码图片）
$getImg = $_POST[&#39;dataimg&#39;];

//1、处理保存 base64编码 的图片，并返回保存的图片URL（可用来处理保存CANVAS转成的图片的）
if($type == &#39;get_imgUrl&#39;){
	//以当前时间+随机字符串设置的不会重复的文件名
	$name = time() . rndStr();
	
	$img = str_replace(&#39; &#39;, &#39;+&#39;, $getImg);
	$img = base64_decode($img);
	
	//存储图片，注意文件夹是否有写入权限
	$dir = iconv("UTF-8", "GBK", "upfile");
	if (!file_exists($dir)){
		mkdir ($dir,0777,true);
	}
	$f = fopen(&#39;upfile/&#39; . $name . &#39;.jpg&#39;, &#39;w+&#39;);
	fwrite($f, $img);
	fclose($f);
	//输出保存的图片URL
	echo &#39;upfile/&#39; . $name . &#39;.jpg&#39;;
	
//2、处理图片，并返回 base64编码 的图片（一般解决JS跨域的问题）
}else if($type == &#39;get_base64&#39;){
	$pic = $getImg;
	//$arr = getimagesize($pic);
	//$pic = "data:{$arr[&#39;mime&#39;]};base64," . base64_encode(file_get_contents($pic));
	$pic = "data:image/jpg;base64," . base64_encode(file_get_contents($pic));
	echo $pic;
}
?>

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