Study notes: Detailed explanation of PHP image upload code_PHP tutorial

Want to know how to write the code for uploading images? Let me analyze it in detail with you. With PHP, you always have multiple ways to accomplish a specific task. Let’s take file upload as an example. Of course, you can use HTTP file upload in the traditional way, transferring files directly to the web server disk.

You can also upload in a more exotic way, using the FTP protocol to complete the upload in two steps: from your local hard drive to the web server, and then to FTP server. PHP supports both FTP and HTTP uploads natively, so you can make the best choice based on your application's design needs. Using PHP's FTP functions to transfer files is almost the same as using a traditional FTP client - you'll see that even the function names are similar to standard FTP commands. Let me share with you a small example of the code for uploading images in PHP. I hope you will give me more opinions. Hey, thank you. Let’s learn together! !

PHP upload image code:

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><?</SPAN><SPAN class=tag-name>phpsession_start</SPAN><SPAN>();</SPAN><SPAN class=tag>?></span><span> </span></span></li>
<li class=""><span> </span></li>
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<span></span><span class="tag"><?</SPAN><SPAN class=tag-name>php</SPAN><SPAN> </SPAN></SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute>id</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>mysql_connect</SPAN><SPAN>('localhost','root','585858');  </SPAN></SPAN><LI class=alt><SPAN>mysql_select_db("okhwyy",$id);  </SPAN><LI class=""><SPAN>mysql_query("setnamesgb2312");  </SPAN><LI class=alt><SPAN></SPAN><SPAN class=tag>?></span><span> </span>
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<li class="">
<span></span><span class="tag"><</SPAN><SPAN class=tag-name>html</SPAN><SPAN class=tag>></span><span> </span>
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<span></span><span class="tag"><</SPAN><SPAN class=tag-name>head</SPAN><SPAN class=tag>></span><span> </span>
</li>
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<span></span><span class="tag"><</SPAN><SPAN class=attribute>metahttp-equiv</SPAN><SPAN class=tag-name>metahttp-equiv</SPAN><SPAN>="Content-Type"</SPAN><SPAN class=attribute-value>c</SPAN><SPAN class=tag>></span><span> </span>
</li>
<li class="alt">
<span></span><span class="tag"><</SPAN><SPAN class=tag-name>title</SPAN><SPAN class=tag>></span><span>限制上传图片的格式</span><span class="tag"></</SPAN><SPAN class=tag-name>title</SPAN><SPAN class=tag>></span><span> </span>
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<span></span><span class="tag"><</SPAN><SPAN class=attribute>styletype</SPAN><SPAN class=tag-name>styletype</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"text/css"</SPAN><SPAN class=tag>></span><span> </span>
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<span><!--  </SPAN><LI class=""><SPAN>.style1{  </SPAN><LI class=alt><SPAN>font-size:14px;  </SPAN><LI class=""><SPAN>font-family:"华文行楷";  </SPAN><LI class=alt><SPAN>}  </SPAN><LI class=""><SPAN>.style4{font-size:12px;font-weight:bold;}  </SPAN><LI class=alt><SPAN>--</SPAN><SPAN class=tag>></span><span> </span>
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<span></span><span class="tag"><</SPAN><SPAN class=tag-name>body</SPAN><SPAN class=tag>></span><span> </span>
</li>
<li class="alt">
<span></span><span class="tag"><</SPAN><SPAN class=attribute>tablewidth</SPAN><SPAN class=tag-name>tablewidth</SPAN><SPAN>="406"</SPAN><SPAN class=attribute-value>height</SPAN><SPAN>="129"</SPAN><SPAN class=attribute>border</SPAN><SPAN>="0"</SPAN><SPAN class=attribute-value>align</SPAN><SPAN>="center"</SPAN><SPAN class=attribute>cellpadding</SPAN><SPAN>="0"</SPAN><SPAN class=attribute-value>cellspacing</SPAN><SPAN>="0"</SPAN><SPAN class=attribute>background</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>""</SPAN><SPAN class=tag>></span><span> </span>
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<span></span><span class="tag"><</SPAN><SPAN class=attribute>tdwidth</SPAN><SPAN class=tag-name>tdwidth</SPAN><SPAN>="106"</SPAN><SPAN class=attribute-value>height</SPAN><SPAN>="40"</SPAN><SPAN class=tag>></span><span class="tag"></</SPAN><SPAN class=tag-name>td</SPAN><SPAN class=tag>></span><span> </span>
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<span></span><span class="tag"><</SPAN><SPAN class=attribute>tdwidth</SPAN><SPAN class=tag-name>tdwidth</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"196"</SPAN><SPAN class=tag>></span><span class="tag"></</SPAN><SPAN class=tag-name>td</SPAN><SPAN class=tag>></span><span> </span>
</li>
<li class="alt">
<span></span><span class="tag"><</SPAN><SPAN class=attribute>tdwidth</SPAN><SPAN class=tag-name>tdwidth</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"31"</SPAN><SPAN class=tag>></span><span class="tag"></</SPAN><SPAN class=tag-name>td</SPAN><SPAN class=tag>></span><span> </span>
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<span></span><span class="tag"></</SPAN><SPAN class=tag-name>tr</SPAN><SPAN class=tag>></span><span> </span>
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<li class="alt">
<span></span><span class="tag"><</SPAN><SPAN class=attribute>formname</SPAN><SPAN class=tag-name>formname</SPAN><SPAN>="form1"</SPAN><SPAN class=attribute-value>method</SPAN><SPAN>="post"</SPAN><SPAN class=attribute>action</SPAN><SPAN>=""</SPAN><SPAN class=attribute-value>enctype</SPAN><SPAN>="multipart/form-data"</SPAN><SPAN class=tag>></span><span> </span>
</li>
<li class="">
<span></span><span class="tag"><</SPAN><SPAN class=tag-name>tr</SPAN><SPAN class=tag>></span><span> </span>
</li>
<li class="alt">
<span></span><span class="tag"><</SPAN><SPAN class=attribute>tdheight</SPAN><SPAN class=tag-name>tdheight</SPAN><SPAN>="32"</SPAN><SPAN class=attribute-value>align</SPAN><SPAN>="right"</SPAN><SPAN class=tag>></span><span class="tag"><</SPAN><SPAN class=attribute>spanclass</SPAN><SPAN class=tag-name>spanclass</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"style1"</SPAN><SPAN class=tag>></span><span>图片路径</span><span class="tag"></</SPAN><SPAN class=tag-name>span</SPAN><SPAN class=tag>></span><span>:</span><span class="tag"></</SPAN><SPAN class=tag-name>td</SPAN><SPAN class=tag>></span><span> </span>
</li>
<li class="">
<span></span><span class="tag"><</SPAN><SPAN class=attribute>tdvalign</SPAN><SPAN class=tag-name>tdvalign</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"middle"</SPAN><SPAN class=tag>></span><span class="tag"><</SPAN><SPAN class=attribute>inputname</SPAN><SPAN class=tag-name>inputname</SPAN><SPAN>="images"</SPAN><SPAN class=attribute-value>type</SPAN><SPAN>="file"</SPAN><SPAN class=attribute>id</SPAN><SPAN>="images2"</SPAN><SPAN class=attribute-value>size</SPAN><SPAN>="15"</SPAN><SPAN class=tag>></span><span> </span>
</li>
<li class="alt">
<span></span><span class="tag"><</SPAN><SPAN class=attribute>inputtype</SPAN><SPAN class=tag-name>inputtype</SPAN><SPAN>="hidden"</SPAN><SPAN class=attribute-value>name</SPAN><SPAN>="MAX_FILE_SIZE"</SPAN><SPAN class=attribute>value</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"30000"</SPAN><SPAN class=tag>></span><span class="tag"></</SPAN><SPAN class=tag-name>td</SPAN><SPAN class=tag>></span><span> </span>
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<span></span><span class="tag"><</SPAN><SPAN class=tag-name>td</SPAN><SPAN class=tag>></span><span class="tag"></</SPAN><SPAN class=tag-name>td</SPAN><SPAN class=tag>></span><span> </span>
</li>
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<span></span><span class="tag"></</SPAN><SPAN class=tag-name>tr</SPAN><SPAN class=tag>></span><span> </span>
</li>
<li class="">
<span></span><span class="tag"><</SPAN><SPAN class=tag-name>tr</SPAN><SPAN class=tag>></span><span> </span>
</li>
<li class="alt">
<span></span><span class="tag"><</SPAN><SPAN class=attribute>tdheight</SPAN><SPAN class=tag-name>tdheight</SPAN><SPAN>="44"</SPAN><SPAN class=attribute-value>align</SPAN><SPAN>="right"</SPAN><SPAN class=attribute>valign</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"middle"</SPAN><SPAN class=tag>></span><span class="tag"><</SPAN><SPAN class=attribute>spanclass</SPAN><SPAN class=tag-name>spanclass</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"style4"</SPAN><SPAN class=tag>></span><span>图片的格式</span><span class="tag"></</SPAN><SPAN class=tag-name>span</SPAN><SPAN class=tag>></span><span>:</span><span class="tag"></</SPAN><SPAN class=tag-name>td</SPAN><SPAN class=tag>></span><span> </span>
</li>
<li class="">
<span></span><span class="tag"><</SPAN><SPAN class=attribute>tdvalign</SPAN><SPAN class=tag-name>tdvalign</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"middle"</SPAN><SPAN class=tag>></span><span class="tag"><</SPAN><SPAN class=attribute>spanclass</SPAN><SPAN class=tag-name>spanclass</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"style4"</SPAN><SPAN class=tag>></span><span>(.jpg)</span><span class="tag"></</SPAN><SPAN class=tag-name>span</SPAN><SPAN class=tag>></span><span class="tag"><</SPAN><SPAN class=attribute>inputtype</SPAN><SPAN class=tag-name>inputtype</SPAN><SPAN>="submit"</SPAN><SPAN class=attribute-value>name</SPAN><SPAN>="Submit"</SPAN><SPAN class=attribute>value</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"提交"</SPAN><SPAN class=tag>></span><span class="tag"></</SPAN><SPAN class=tag-name>td</SPAN><SPAN class=tag>></span><span> </span>
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<span></span><span class="tag"><</SPAN><SPAN class=tag-name>td</SPAN><SPAN class=tag>></span><span class="tag"></</SPAN><SPAN class=tag-name>td</SPAN><SPAN class=tag>></span><span> </span>
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<span></span><span class="tag"></</SPAN><SPAN class=tag-name>tr</SPAN><SPAN class=tag>></span><span> </span>
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<li class="alt">
<span></span><span class="tag"></</SPAN><SPAN class=tag-name>form</SPAN><SPAN class=tag>></span><span> </span>
</li>
<li class="">
<span></span><span class="tag"><</SPAN><SPAN class=tag-name>tr</SPAN><SPAN class=tag>></span><span> </span>
</li>
<li class="alt">
<span></span><span class="tag"><</SPAN><SPAN class=attribute>tdheight</SPAN><SPAN class=tag-name>tdheight</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"10"</SPAN><SPAN class=tag>></span><span class="tag"></</SPAN><SPAN class=tag-name>td</SPAN><SPAN class=tag>></span><span> </span>
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</li>
<li class="alt">
<span></span><span class="tag"><</SPAN><SPAN class=tag-name>td</SPAN><SPAN class=tag>></span><span class="tag"></</SPAN><SPAN class=tag-name>td</SPAN><SPAN class=tag>></span><span> </span>
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<span></span><span class="tag"></</SPAN><SPAN class=tag-name>tr</SPAN><SPAN class=tag>></span><span> </span>
</li>
<li class="alt">
<span></span><span class="tag"></</SPAN><SPAN class=tag-name>table</SPAN><SPAN class=tag>></span><span> </span>
</li>
<li class="">
<span></span><span class="tag"><</SPAN><SPAN class=attribute>tablewidth</SPAN><SPAN class=tag-name>tablewidth</SPAN><SPAN>="406"</SPAN><SPAN class=attribute-value>height</SPAN><SPAN>="129"</SPAN><SPAN class=attribute>border</SPAN><SPAN>="1"</SPAN><SPAN class=attribute-value>align</SPAN><SPAN>="center"</SPAN><SPAN class=attribute>cellpadding</SPAN><SPAN>="0"</SPAN><SPAN class=attribute-value>cellspacing</SPAN><SPAN>="0"</SPAN><SPAN class=tag>></span><span> </span>
</li>
<li class="alt">
<span></span><span class="tag"><?</SPAN><SPAN class=tag-name>php</SPAN><SPAN> </SPAN></SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute>query</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"select*fromtb_image2whereidorderbydatadesclimit2"</SPAN><SPAN>;  </SPAN></SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute>result</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>mysql_query</SPAN><SPAN>($query);  </SPAN></SPAN><LI class=""><SPAN>if($result){  </SPAN><LI class=alt><SPAN>while($</SPAN><SPAN class=attribute>row</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>mysql_fetch_array</SPAN><SPAN>($result)){  </SPAN></SPAN><LI class=""><SPAN></SPAN><SPAN class=tag>?></span><span> </span>
</li>
<li class="alt">
<span></span><span class="tag"><</SPAN><SPAN class=tag-name>tr</SPAN><SPAN class=tag>></span><span> </span>
</li>
<li class="">
<span></span><span class="tag"><</SPAN><SPAN class=attribute>tdwidth</SPAN><SPAN class=tag-name>tdwidth</SPAN><SPAN>="106"</SPAN><SPAN class=attribute-value>align</SPAN><SPAN>="center"</SPAN><SPAN class=tag>></span><span class="tag"><?</SPAN><SPAN class=tag-name>phpecho</SPAN><SPAN>$row[data];</SPAN><SPAN class=tag>?></span><span class="tag"></</SPAN><SPAN class=tag-name>td</SPAN><SPAN class=tag>></span><span> </span>
</li>
<li class="alt">
<span></span><span class="tag"><</SPAN><SPAN class=attribute>tdwidth</SPAN><SPAN class=tag-name>tdwidth</SPAN><SPAN>="196"</SPAN><SPAN class=attribute-value>align</SPAN><SPAN>="center"</SPAN><SPAN class=tag>></span><span class="tag"><</SPAN><SPAN class=attribute>imgsrc</SPAN><SPAN class=tag-name>imgsrc</SPAN><SPAN>="</SPAN><SPAN class=tag><?</SPAN><SPAN class=tag-name>phpecho</SPAN><SPAN>$row[path];</SPAN><SPAN class=tag>?></span><span>"</span><span class="attribute-value">width</span><span>="200"</span><span class="attribute">height</span><span>=</span><span class="attribute-value">"120"</span><span class="tag">></span><span class="tag"></</SPAN><SPAN class=tag-name>td</SPAN><SPAN class=tag>></span><span> </span>
</li>
<li class="">
<span></span><span class="tag"></</SPAN><SPAN class=tag-name>tr</SPAN><SPAN class=tag>></span><span> </span>
</li>
<li class="alt">
<span></span><span class="tag"><?</SPAN><SPAN class=tag-name>php</SPAN><SPAN>}}</SPAN><SPAN class=tag>?></span><span> </span>
</li>
<li class="">
<span></span><span class="tag"></</SPAN><SPAN class=tag-name>table</SPAN><SPAN class=tag>></span><span> </span>
</li>
<li class="alt"><span> </span></li>
<li class="">
<span></span><span class="tag"></</SPAN><SPAN class=tag-name>body</SPAN><SPAN class=tag>></span><span> </span>
</li>
<li class="alt">
<span></span><span class="tag"></</SPAN><SPAN class=tag-name>html</SPAN><SPAN class=tag>></span><span> </span>
</li>
<li class=""><span> </span></li>
<li class="alt">
<span></span><span class="tag"><?</SPAN><SPAN class=tag-name>php</SPAN><SPAN> </SPAN></SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute>Submit</SPAN><SPAN>=$_POST[Submit];  </SPAN></SPAN><LI class=alt><SPAN>if($Submit){  </SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute>image</SPAN><SPAN>=$_FILES['images']['name'];  </SPAN></SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute>date</SPAN><SPAN class=attribute-value>date</SPAN><SPAN>=date("Y-m-d");  </SPAN></SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute>path</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>"upfiles/"</SPAN><SPAN>.$_FILES['images']['name'];  </SPAN></SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute>type</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>strstr</SPAN><SPAN>($path,".");  </SPAN></SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute>size</SPAN><SPAN>=$_FILES['images']['size'];  </SPAN></SPAN><LI class=alt><SPAN>if($size</SPAN><SPAN class=tag>></span><span>1000000){echo"</span><span class="tag"><</SPAN><SPAN class=tag-name>script</SPAN><SPAN class=tag>></span><span>alert('上传容量超限');history.back();</span><span class="tag"></</SPAN><SPAN class=tag-name>script</SPAN><SPAN class=tag>></span><span>";}  </span>
</li>
<li class="">
<span>elseif($type!=".jpg"){echo"</span><span class="tag"><</SPAN><SPAN class=tag-name>script</SPAN><SPAN class=tag>></span><span>alert('上传类型不对');history.back();</span><span class="tag"></</SPAN><SPAN class=tag-name>script</SPAN><SPAN class=tag>></span><span>";}  </span>
</li>
<li class="alt"><span>elseif(move_uploaded_file($_FILES['images']['tmp_name'],$path)){  </span></li>
<li class="">
<span>$</span><span class="attribute">query</span><span>=</span><span class="attribute-value">"insertintotb_image2(image_name,path,data)values('$image','$path','$date')"</span><span>;  </span>
</li>
<li class="alt">
<span>$</span><span class="attribute">result</span><span>=</span><span class="attribute-value">mysql_query</span><span>($query)ordie(mysql_error());  </span>
</li>
<li class=""><span>if($result){  </span></li>
<li class="alt"><span>echo"上传成功!";  </span></li>
<li class="">
<span>echo"</span><span class="tag"><</SPAN><SPAN class=attribute>metahttp-equiv</SPAN><SPAN class=tag-name>metahttp-equiv</SPAN><SPAN>=&#92;"Refresh&#92;"</SPAN><SPAN class=attribute>content</SPAN><SPAN>=&#92;"3;</SPAN><SPAN class=attribute>url</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>index</SPAN><SPAN>.php&#92;"</SPAN><SPAN class=tag>></span><span>";  </span>
</li>
<li class="alt"><span>}  </span></li>
<li class=""><span>else{  </span></li>
<li class="alt"><span>echo"上传失败!";  </span></li>
<li class="">
<span>echo"</span><span class="tag"><</SPAN><SPAN class=attribute>metahttp-equiv</SPAN><SPAN class=tag-name>metahttp-equiv</SPAN><SPAN>=&#92;"Refresh&#92;"</SPAN><SPAN class=attribute>content</SPAN><SPAN>=&#92;"3;</SPAN><SPAN class=attribute>url</SPAN><SPAN>=</SPAN><SPAN class=attribute-value>index</SPAN><SPAN>.php&#92;"</SPAN><SPAN class=tag>></span><span>";  </span>
</li>
<li class="alt"><span>}}}  </span></li>
<li class=""><span> </span></li>
<li class="alt">
<span></span><span class="tag">?></span><span> </span>
</li>
</ol>

http://www.bkjia.com/PHPjc/446551.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/446551.htmlTechArticleWant to know how to write the code to upload images? Let me analyze it in detail with you. With PHP, you always have multiple ways to accomplish a specific task. Let’s take the text...