Web Reference: readfile () will not present any memory issues, even when sending large files, on its own. If you encounter an out of memory error ensure that output buffering is off with ob_get_level (). Here is the PHP code to read the file, and write it to the output buffer: The readfile() function is useful if all you want to do is open a file and write its contents to the browser. The next chapters will teach you more about PHP file handling. Jul 11, 2025 · The readfile () function in PHP reads a file and writes its contents directly to the output buffer (usually the browser). It’s an easy way to show a file without reading it line by line yourself. If there’s a problem reading the file, like if it doesn’t exist, PHP will usually show an error message.
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