Uploading files to the server
Consider uploading files to a PHP server using the POST method. This will require a form with the file field type and an enctype attribute with a multipart/form-data value.
HTML
<form method="POST" enctype="multipart/form-data">
<input type="hidden" name="MAX_FILE_SIZE" value="2097152" />
<input type="file" name="uploaded_file">
<input type="submit" name="submit" value="send">
</form>
The field with name="MAX_FILE_SIZE" must be placed above the input type="file", the value is set in bytes. The field is optional and the check must be still on the server. After sending the data of the uploaded file get into the $_FILES array
if(isset($_FILES["uploaded_file"])){ //field´s name type="file"
$maxsize = 1024 * 1024* 2; //limited the allowed file size to 2 MB
$errors = [];
//valid file extensions
$acceptable = [
'application/pdf',
'image/jpeg',
'image/jpg',
'image/gif',
'image/png'
];
if (is_uploaded_file($_FILES['uploaded_file']['tmp_name'])) {
if(($_FILES['uploaded_file']['size'] >= $maxsize) || ($_FILES["uploaded_file"]["size"] == 0)) {
$errors[] = 'File too large. File must be less than 2 megabytes.';
}
if(!in_array($_FILES['uploaded_file']['type'], $acceptable) && (!empty($_FILES["uploaded_file"]["type"]))){
$errors[] = 'Invalid file type. Only PDF, JPG, GIF and PNG types are accepted.';
}
if(!count($errors)) {
$uploaddir = __DIR__ . '/upload/'; //upload folder
$uploadfile = $uploaddir . $_FILES['uploaded_file']['name'];
move_uploaded_file($_FILES['uploaded_file']['tmp_name'], $uploadfile);
} else {
foreach($errors as $error) {
echo $error . '
';
}
}
}
}
You can upload multiple files at once. PHP supports the ability to transfer an array of HTML including files.
HTML
<form method="POST" enctype="multipart/form-data">
<input type="hidden" name="MAX_FILE_SIZE" value="2097152" />
<input type="file" name="pictures[]">
<input type="file" name="pictures[]">
<input type="file" name="pictures[]">
<input type="submit" name="submit" value="send">
</form>
PHP
if(isset($_FILES["pictures"])){
$maxsize = 1024 * 1024* 2;
$errors = [];
$acceptable = [
'application/pdf',
'image/jpeg',
'image/jpg',
'image/gif',
'image/png'
];
foreach ($_FILES["pictures"]["error"] as $key => $error) {
if ($error == UPLOAD_ERR_OK) {
if (is_uploaded_file($_FILES['pictures']['tmp_name'][$key])) {
if(($_FILES['pictures']['size'][$key] >= $maxsize) || ($_FILES["pictures"]["size"][$key] == 0)) {
$errors[] = 'File too large. File must be less than 2 megabytes.';
}
if(!in_array($_FILES['pictures']['type'][$key], $acceptable) && (!empty($_FILES["pictures"]["type"][$key]))){
$errors[] = 'Invalid file type. Only PDF, JPG, GIF and PNG types are accepted.';
}
if(!count($errors)) {
$uploaddir = __DIR__ . '/upload/';
$uploadfile = $uploaddir . $_FILES['pictures']['name'][$key];
move_uploaded_file($_FILES['pictures']['tmp_name'][$key], $uploadfile);
} else {
foreach($errors as $error) {
echo $error . '
';
}
}
}
}
}
}
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