在我的网站上，用户的用户名可以在PHP中显示为
<?=$c->username?>
我需要将图像另存为
<?=$c->username?>.png
我还需要图像而不是右翼才能打开。当尝试上传另一张同名图像时，它只会出错。
<?php
$allowedExts = array("gif", "jpeg", "jpg", "png");
$temp = explode(".", $_FILES["file"]["name"]);
$extension = end($temp);
if ((($_FILES["file"]["type"] == "image/gif")
|| ($_FILES["file"]["type"] == "image/jpeg")
|| ($_FILES["file"]["type"] == "image/jpg")
|| ($_FILES["file"]["type"] == "image/pjpeg")
|| ($_FILES["file"]["type"] == "image/x-png")
|| ($_FILES["file"]["type"] == "image/png"))
&& ($_FILES["file"]["size"] < 20000)
&& in_array($extension, $allowedExts))
{
if ($_FILES["file"]["error"] > 0)
{
echo "Return Code: " . $_FILES["file"]["error"] . "<br>";
}
else
{
echo "Upload: " . $_FILES["file"]["name"] . "<br>";
echo "Type: " . $_FILES["file"]["type"] . "<br>";
echo "Size: " . ($_FILES["file"]["size"] / 1024) . " kB<br>";
echo "Temp file: " . $_FILES["file"]["tmp_name"] . "<br>";
if (file_exists("/example/" . $_FILES["file"]["name"]))
{
echo $_FILES["file"]["name"] . " already exists. ";
}
else
{
move_uploaded_file($_FILES["file"]["tmp_name"],
"/example/" . $_FILES["file"]["name"]);
echo "Stored in: " . "/example/". $_FILES["file"]["name"];
}
}
}
else
{
echo "Invalid file";
}
?>
move_uploaded_file已经做了你想要的。
该错误很可能是由于您正在写入绝对路径(即文件系统根目录中名为"example"的目录，而不是当前Web服务器根目录中的子目录"example"(引起的。
此外，您可以准备一组允许的类型并检查in_array：
$allowed_types = array('image/gif', 'image/jpeg', ...);
if ((in_array($_FILES['file']['type'], $allowed_types)
&& ...) {
...
另一件值得做的事情是定义一些变量，这样您就可以确保始终使用相同的值，因为您只分配一次它们。如果您在变量名称中输入了拼写错误，您将收到通知，而如果您在修改后输入路径或忘记更新多个实例之一，则可能会出现无提示和/或难以诊断的错误。
$destination_dir = './example/'; // Also, note the "." at the beginning
// SECURITY: do not trust the name supplied by the user! At least use basename().
$basename = basename($_FILES["file"]["name"]);
if (!is_dir($destination_dir)) {
trigger_error("Destination dir {$destination_dir} is not writeable", E_USER_ERROR);
die();
}
if (file_exists($destination_file = $destination_dir . $basename)) {
echo "{$basename} already exists";
} else {
move_uploaded_file($_FILES["file"]["tmp_name"],
$destination_file);
echo "Stored in: {$destination_file}";
}
在您的情况下，您希望以<?= $c->username ?>.png将其加载回浏览器中的方式保存图片。
为此，您需要两件事：文件路径和图像格式，必须是PNG。在告诉浏览器您要发送 PNG 后发送 JPEG 可能不起作用(某些浏览器会自动识别格式，而其他浏览器则不会(。您可能还希望将图像调整为特定大小。
所以你应该做这样的事情：
// We ignore the $basename supplied by the user, using its username.
// **I assume that you know how to retrieve $c at this point.**
$basename = $c->username . '.png';
$destination_file = $destination_dir . $basename;
if ('image/png' == $_FILES['file']['type']) {
// No need to do anything, except perhaps resizing.
move_uploaded_file($_FILES["file"]["tmp_name"], $destination_file);
} else {
// Problem. The file is not PNG.
$temp_file = $destination_file . '.tmp';
move_uploaded_file($_FILES["file"]["tmp_name"], $temp_file);
$image_data = file_get_contents($temp_file);
unlink($temp_file);
// Now we have image data as a string.
$gd = ImageCreateFromString($image_data);
// Save it as PNG.
ImagePNG($gd, $destination_file);
ImageDestroy($gd);
}
// Optional resize.
if (false) {
list($w, $h) = getImageSize($destination_file);
// Fit it into a 64x64 square.
$W = 64;
$H = 64;
if (($w != $W) || ($h != $H)) {
$bad = ImageCreateFromPNG($destination_file);
$good = ImageCreateTrueColor($W, $H);
$bgnd = ImageColorAllocate($good, 255, 255, 255); // White background
ImageFilledRectangle($good, 0, 0, $W, $H, $bgnd);
// if the image is too wide, it will become $W-wide and <= $H tall.
// So it will have an empty strip top and bottom.
if ($w > $W*$h/$H) {
$ww = $W;
$hh = $ww * $h / $w;
$xx = 0;
$yy = floor(($H - $hh)/2);
} else {
// It will be $H tall, and l.o.e. than $W wide
$hh = $H;
$ww = $hh * $w / $h;
$xx = floor(($W - $ww)/2);
$yy = 0;
}
ImageCopyResampled($good, $bad,
$xx, $yy, 0, 0,
$ww, $hh, $w, $h
);
// Save modified image.
ImageDestroy($bad);
ImagePNG($good, $destination_file);
ImageDestroy($good);
}
}