get_file_data() WP 1.0

Retrieve metadata from a file.

Searches for metadata in the first 8kiB of a file, such as a plugin or theme. Each piece of metadata must be on its own line. Fields can not span multiple lines, the value will get cut at the end of the first line.

If the file data is not within that first 8kiB, then the author should correct their plugin file and move the data headers to the top.

Hooks in function

Return

Array. Array of file headers in HeaderKey => Header Value format.

Usage

get_file_data( $file, $default_headers, $context );

$file(string) (required)

Path to the file.

$default_headers(array) (required)

List of headers, in the format array('HeaderKey' => 'Header Name').

$context(string)

If specified adds filter hook {@see 'extra_$context_headers'}.
Default: ''

Code of get file data: wp-includes/functions.php ^{VER 5.0.3}

<?php
function get_file_data( $file, $default_headers, $context = '' ) {
	// We don't need to write to the file, so just open for reading.
	$fp = fopen( $file, 'r' );

	// Pull only the first 8kiB of the file in.
	$file_data = fread( $fp, 8192 );

	// PHP will close file handle, but we are good citizens.
	fclose( $fp );

	// Make sure we catch CR-only line endings.
	$file_data = str_replace( "\r", "\n", $file_data );

	/**
	 * Filters extra file headers by context.
	 *
	 * The dynamic portion of the hook name, `$context`, refers to
	 * the context where extra headers might be loaded.
	 *
	 * @since 2.9.0
	 *
	 * @param array $extra_context_headers Empty array by default.
	 */
	if ( $context && $extra_headers = apply_filters( "extra_{$context}_headers", array() ) ) {
		$extra_headers = array_combine( $extra_headers, $extra_headers ); // keys equal values
		$all_headers = array_merge( $extra_headers, (array) $default_headers );
	} else {
		$all_headers = $default_headers;
	}

	foreach ( $all_headers as $field => $regex ) {
		if ( preg_match( '/^[ \t\/*#@]*' . preg_quote( $regex, '/' ) . ':(.*)$/mi', $file_data, $match ) && $match[1] )
			$all_headers[ $field ] = _cleanup_header_comment( $match[1] );
		else
			$all_headers[ $field ] = '';
	}

	return $all_headers;
}

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From tag: Files data (get file info)

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