get_file_data( string $file, array $default_headers, string $context = '' )

Retrieve metadata from a file.

Contents

Description

Searches for metadata in the first 8 KB 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 8 KB, then the author should correct their plugin file and move the data headers to the top.

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Parameters

$file

(string) (Required) Absolute path to the file.

$default_headers

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

$context

(string) (Optional) If specified adds filter hook 'extra_$context_headers'.

Default value: ''

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Return

(string[]) Array of file header values keyed by header name.

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Source

File: wp-includes/functions.php 

function get_file_data( $file, $default_headers, $context = '' ) {
	// Pull only the first 8 KB of the file in.
	$file_data = file_get_contents( $file, false, null, 0, 8 * KB_IN_BYTES );

	if ( false === $file_data ) {
		$file_data = '';
	}

	// 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.
	 */
	$extra_headers = $context ? apply_filters( "extra_{$context}_headers", array() ) : array();
	if ( $extra_headers ) {
		$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]*<\?php)?[ \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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Used By

Used By
Used By Description
wp-includes/block-patterns.php: _register_theme_block_patterns()

Register any patterns that the active theme may provide under its ./patterns/ directory. Each pattern is defined as a PHP file and defines its metadata using plugin-style headers. The minimum required definition is:
wp-admin/includes/class-theme-upgrader.php: Theme_Upgrader::check_package()

Checks that the package source contains a valid theme.
wp-admin/includes/plugin.php: get_plugin_data()

Parses the plugin contents to retrieve plugin’s metadata.
wp-includes/l10n.php: wp_get_pomo_file_data()

Extract headers from a PO file.
wp-includes/class-wp-theme.php: WP_Theme::__construct()

Constructor for WP_Theme.

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Changelog

Changelog
Version Description
2.9.0 Introduced.

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User Contributed Notes

  1. Skip to note 1 content
    You must log in to vote on the helpfulness of this noteVote results for this note: 2You must log in to vote on the helpfulness of this note
    Contributed by Josh Smith — 
    /**
 * Register stylesheet and scripts
 * Set the version of each the version of the plugin. 
 */
function register_plugin_styles_scripts() {
	// Set the file path to a variable.
	$file_path = plugin_dir_path( __DIR__ ) . 'example-plugin-file.php';
	// Read the version number from the main plugin file then set it to a variable.
	$plugin_data = get_file_data( $file_path, array(
		'Version' => 'Version'
	) );

	if ( ! empty( $plugin_data['Version'] ) ) {
		// The the value of the Version header to a variable.
		$ver = $plugin_data['Version'];

		// Use the variable, $ver, in more than one stylesheet/script to bust cache when the plugin gets updated.
		wp_enqueue_style( 'public-style', plugins_url( 'path/to/stylesheet.css' ), array(), $ver );
		wp_enqueue_script('public-script', plugins_url( 'path/to/script.js' ), array(), $ver , true);
	}
}

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