The PHP documentation implies that a browser may alert the user that his upload is too big - this is simply wrong. Up til today there has never been a RFC proposing the usage of such named form field, nor has there been a browser actually checking its existance or content, or preventing anything. This, however, is not true and has never been. The PHP documentation also makes (or made - see bug #40387 - ) vague references to "allows browsers to check the file size before uploading". If the uploaded file is bigger than the integer in this field, PHP disallows this upload and presents an error code in the $_FILES-Array. It checks the existance of a form field names "max_file_size" (upper case is also OK), which should contain an integer with the maximum number of bytes allowed. ![]() In addition to this PHP somehow got implemented a soft limit feature. The two widely known limits are the php.ini settings "post_max_size" and "upload_max_size", which in combination impose a hard limit on the maximum amount of data that can be received. PHP has the somewhat strange feature of checking multiple "maximum file sizes". ![]() Throw new RuntimeException ( 'Failed to move uploaded file.' ) Ĭlarification on the MAX_FILE_SIZE hidden form field: On this example, obtain safe unique name from its binary data. DO NOT USE $_FILES WITHOUT ANY VALIDATION !! Throw new RuntimeException ( 'Invalid file format.' ) $finfo = new finfo ( FILEINFO_MIME_TYPE ) Throw new RuntimeException ( 'Exceeded filesize limit.' ) The following code cannot cause any errors absolutely. ![]() You'd better check $_FILES structure and values throughly. Getting Started Introduction A simple tutorial Language Reference Basic syntax Types Variables Constants Expressions Operators Control Structures Functions Classes and Objects Namespaces Enumerations Errors Exceptions Fibers Generators Attributes References Explained Predefined Variables Predefined Exceptions Predefined Interfaces and Classes Predefined Attributes Context options and parameters Supported Protocols and Wrappers Security Introduction General considerations Installed as CGI binary Installed as an Apache module Session Security Filesystem Security Database Security Error Reporting User Submitted Data Hiding PHP Keeping Current Features HTTP authentication with PHP Cookies Sessions Dealing with XForms Handling file uploads Using remote files Connection handling Persistent Database Connections Command line usage Garbage Collection DTrace Dynamic Tracing Function Reference Affecting PHP's Behaviour Audio Formats Manipulation Authentication Services Command Line Specific Extensions Compression and Archive Extensions Cryptography Extensions Database Extensions Date and Time Related Extensions File System Related Extensions Human Language and Character Encoding Support Image Processing and Generation Mail Related Extensions Mathematical Extensions Non-Text MIME Output Process Control Extensions Other Basic Extensions Other Services Search Engine Extensions Server Specific Extensions Session Extensions Text Processing Variable and Type Related Extensions Web Services Windows Only Extensions XML Manipulation GUI Extensions Keyboard Shortcuts ? This help j Next menu item k Previous menu item g p Previous man page g n Next man page G Scroll to bottom g g Scroll to top g h Goto homepage g s Goto search
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