php file then upload error code

php file upload error code: first mark the form in the html; then add a hidden field in the form and in front of the file; finally predefine the variable [$_FILES] array.

php file upload error code:

Note:

1. When uploading a file, the form form in the html must be marked:

enctype='multipart/form-data'

2. There is a saying that it must be in the form form and add a hidden field in front of the file, such as:

<input type=hidden name=&#39;MAX_FILE_SIZE&#39; value=&#39;value&#39;>

File upload error code:

1. The predefined variable $_FILES array has 5 contents:

• $_FILES[' userfile']['name']——The original name of the client machine file

• $_FILES['userfile']['type']——The MIME type of the file

• $_FILES['userfile']['size']——The size of the uploaded file, in bytes

• $_FILES['userfile ']['tmp_name'] - the temporary file name stored on the server after the file is uploaded

• $_FILES['userfile']['error'] - and the file Upload related error codes

2. Among them, $_FILES['userfile']['error'] can have the following values ​​and meanings:

• 0 - No errors occurred and the file was uploaded successfully. It’s not necessarily true that a file has been uploaded. It’s possible that you can check and find that the size is 0.

• 1 - The uploaded file exceeds the limit of the upload_max_filesize option in php.ini.

• 2 - The size of the uploaded file exceeds the value specified by the MAX_FILE_SIZE option in the HTML form.

• #3——Only part of the file was uploaded.​

• #4——No files were uploaded. It means that the file field of the form has no content and is an empty string.

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