[英]Problem while checking image type and image size
我正在从管理控制台上传图像。 它被发送到imageupload.php
页面。 代码如下。
问题是,如果我上传的图像超过3 mb,它仍然说文件类型无效。 代码有什么问题? 为什么总是只显示无效的文件类型警报? 对于正确的图像,它工作正常。
还请建议对本代码进行增强。 如何使它更好。
<?php
include "dblink.php";
include "session.php";
if (isset($_SESSION['userbu'])) {
if (isset($_FILES['image'])) {
$len = count($_FILES['image']['name']);
$image = $_FILES['image'];
$img_name = $_FILES['image']['name'][0];
$img_size = $_FILES['image']['size'][0];
$tmp_dir = $_FILES['image']['tmp_name'][0];
$type = $_FILES['image']['type'][0];
$checktype = 1;
$checksize = 1;
for ($i = 0; $i < $len; $i++) {
if ($_FILES['image']['type'][$i] == "image/jpeg" || $_FILES['image']['type'][$i] == "image/jpg" || $_FILES['image']['type'][$i] == "image/png") {
if ($_FILES['image']['size'][$i] <= '3145728') {
} else {
$checksize = 0;
break;
}
} else {
$checktype = 0;
break;
}
}
if ($checksize == 1 && $checktype == 1) {
for ($i = 0; $i < $len; $i++) {
move_uploaded_file($_FILES['image']['tmp_name'][$i], "imagesbu/" . $_FILES['image']['name'][$i]);
}
echo '<script language="javascript">';
echo 'if(alert("Successfully Added")){} ';
echo 'else{window.location = "carousel.php"}';
echo '</script>';
} elseif ($checksize == 0) {
echo '<script language="javascript">';
echo 'if(alert("Invalid file size")){} ';
echo 'else{window.location = "carousel.php"}';
echo '</script>';
} elseif ($checktype == 0) {
echo '<script language="javascript">';
echo 'if(alert("Invalid file type")){} ';
echo 'else{window.location = "carousel.php"}';
echo '</script>';
} else {
echo '<script language="javascript">';
echo 'if(alert("Invalid file type/size")){} ';
echo 'else{window.location = "carousel.php"}';
echo '</script>';
}
} else {
header("location:dashboard.php");
}
} else {
header("location:adminlogin.html");
}
?>
关于if/else
,如果满足任何最高条件,则程序将不会寻找另一个elseif
。 因此,您可以这样做来解决您的问题:
if($checksize==1 && $checktype==1)
{
for($i=0;$i<$len;$i++)
{
move_uploaded_file($_FILES['image']['tmp_name'][$i],"imagesbu/".$_FILES['image']['name'][$i]);
}
echo '<script language="javascript">';
echo 'if(alert("Successfully Added")){} ';
echo 'else{window.location = "carousel.php"}';
echo '</script>';
}
else{
if($checksize==0)
{
echo '<script language="javascript">';
echo 'if(alert("Invalid file size")){} ';
echo 'else{window.location = "carousel.php"}';
echo '</script>';
}
if($checktype==0)
{
echo '<script language="javascript">';
echo 'if(alert("Invalid file type")){} ';
echo 'else{window.location = "carousel.php"}';
echo '</script>';
}
}
关于优化代码,您可以避免多次编写相同的内容,例如:
if($checksize==1 && $checktype==1)
{
for($i=0;$i<$len;$i++)
{
move_uploaded_file($_FILES['image']['tmp_name'][$i],"imagesbu/".$_FILES['image']['name'][$i]);
}
$msg = "Uploaded successfully";
}
else{
if($checksize==0 && $checktype==0)
{
$msg = "Invalid file type/size";
}
elseif($checktype==0)
{
$msg = "Invalid file type";
}else{
$msg = "Invalid file size";
}
}
echo '<script language="javascript">';
echo 'alert("'.$msg.'");';
echo 'window.location = "carousel.php";';
echo '</script>';
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