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For example, in a photo gallery we would only really be interested in JPEG and possibly GIF and PNG files. See Chapter 8, Content Formatting with Regular Expressions for help with regular expression syntax.
If you make a permanent copy of the temporary file, you might want to give it its original name instead of the automatically-generated temporary filename that’s described above.
tag that submitted the file, so the actual array index will depend on that attribute.
The file input field in our HTML form above is named "file To Upload". If the file is larger than 500KB, an error message is displayed, and $upload Ok is set to 0: 500000) // Allow certain file formatsif($image File Type !
= "gif" ) // Check if $upload Ok is set to 0 by an errorif ($upload Ok == 0) else ?