apply_filters( ‘pre_wp_filesize’, null|int $size, string $path )

Filters the result of wp_filesize() before the file_exists() PHP function is run.

Parameters

$sizenull|int: The unfiltered value. Returning a non-negative number from the callback bypasses the filesize call.
$pathstring: Path to the file.

$size = apply_filters( 'pre_wp_filesize', null, $path );

Used by	Description
wp_filesize()`wp-includes/functions.php`	Wrapper for PHP filesize with filters and casting the result as an integer.

Version	Description
7.1.0	Negative values are now ignored, being treated the same as null. Numeric values are cast to integers.
6.0.0	Introduced.

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