PHP is_file() Function: Description, Parameters, Return Values, and Usage Examples
The article explains PHP's is_file() function, detailing its signature, parameter description, return values, important notes on large files and caching, and provides two practical code examples demonstrating how to check for regular files.
is_file() checks whether a given filename refers to a regular file.
Signature: bool is_file(string $filename)
Parameter: $filename – the path to the file.
Return value: Returns TRUE if the file exists and is a regular file; otherwise returns FALSE .
Note: On 32‑bit systems, files larger than 2 GB may produce unexpected results; use clearstatcache() to clear cached results.
Example 1:
Outputs bool(true) for an existing regular file and bool(false) for a directory.
Example 2:
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