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php - 如何在使用php在mysql中上传时调整图像大小

转载 作者:行者123 更新时间:2023-11-30 23:28:14 25 4
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我有以下代码用于将图像上传到数据库中。

<html>
<head><title>File Insert</title></head>
<body>
<h3>Please Choose a File and click Submit</h3>

<form enctype="multipart/form-data" action=
"<?php echo $_SERVER['server address']; ?>" method="post">
<input type="hidden" name="MAX_FILE_SIZE" value="10000000" />
<input name="userfile" type="file" />
<input type="submit" value="Submit" />
</form>

<?php

// check if a file was submitted
if(!isset($_FILES['userfile']))
{
echo '<p>Please select a file</p>';
}
else
{
try {
$msg= upload(); //this will upload your image
echo $msg; //Message showing success or failure.
}
catch(Exception $e) {
echo $e->getMessage();
echo 'Sorry, could not upload file';
}
}

// the upload function

function upload() {
$host="your_hostname";
$user="your_databaseuser";
$pass="your_database_password";
$db="database_name_to_use";
$maxsize = 10000000; //set to approx 10 MB

//check associated error code
if($_FILES['userfile']['error']==UPLOAD_ERR_OK) {

//check whether file is uploaded with HTTP POST
if(is_uploaded_file($_FILES['userfile']['tmp_name'])) {

//checks size of uploaded image on server side
if( $_FILES['userfile']['size'] < $maxsize) {

//checks whether uploaded file is of image type
if(strpos(mime_content_type($_FILES['userfile']['tmp_name']),"image")===0) {
// $finfo = finfo_open(FILEINFO_MIME_TYPE);
// if(strpos(finfo_file($finfo, $_FILES['userfile']['tmp_name']),"image")===0) {

// prepare the image for insertion
$imgData =addslashes (file_get_contents($_FILES['userfile']['tmp_name']));

// put the image in the db...
// database connection
mysql_connect($host, $user, $pass) OR DIE (mysql_error());

// select the db
mysql_select_db ($db) OR DIE ("Unable to select db".mysql_error());

// our sql query
$sql = "INSERT INTO test_image
(image, name)
VALUES
('{$imgData}', '{$_FILES['userfile']['name']}');";

// insert the image
mysql_query($sql) or die("Error in Query: " . mysql_error());
$msg='<p>Image successfully saved in database with id ='. mysql_insert_id().' </p>';
}
else
$msg="<p>Uploaded file is not an image.</p>";
}
else {
// if the file is not less than the maximum allowed, print an error
$msg='<div>File exceeds the Maximum File limit</div>
<div>Maximum File limit is '.$maxsize.' bytes</div>
<div>File '.$_FILES['userfile']['name'].' is '.$_FILES['userfile']['size'].
' bytes</div><hr />';
}
}
else
$msg="File not uploaded successfully.";

}
else {
$msg= file_upload_error_message($_FILES['userfile']['error']);
}
return $msg;
}

// Function to return error message based on error code

function file_upload_error_message($error_code) {
switch ($error_code) {
case UPLOAD_ERR_INI_SIZE:
return 'The uploaded file exceeds the upload_max_filesize directive in php.ini';
case UPLOAD_ERR_FORM_SIZE:
return 'The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form';
case UPLOAD_ERR_PARTIAL:
return 'The uploaded file was only partially uploaded';
case UPLOAD_ERR_NO_FILE:
return 'No file was uploaded';
case UPLOAD_ERR_NO_TMP_DIR:
return 'Missing a temporary folder';
case UPLOAD_ERR_CANT_WRITE:
return 'Failed to write file to disk';
case UPLOAD_ERR_EXTENSION:
return 'File upload stopped by extension';
default:
return 'Unknown upload error';
}
}
?>
</body>
</html>

我的问题是这段代码正在保存图像的完整大小。我想在上传到数据库之前调整图像的大小。我该怎么做???

最佳答案

首先你必须通过 imagecreatefromjpeg($string path to file) 从文件创建位图, 比 ImageCreateTrueColor($tmbWs,$tmbHs); 的空位图,在此使用后 ImageCopyResampled()

关于php - 如何在使用php在mysql中上传时调整图像大小,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/12034955/

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