wp_initial_constants()

18function wp_initial_constants() {19	global $blog_id, $wp_version;20 21	/**#@+22	 * Constants for expressing human-readable data sizes in their respective number of bytes.23	 *24	 * @since 4.4.025	 * @since 6.0.0 `PB_IN_BYTES`, `EB_IN_BYTES`, `ZB_IN_BYTES`, and `YB_IN_BYTES` were added.26	 */27	define( 'KB_IN_BYTES', 1024 );28	define( 'MB_IN_BYTES', 1024 * KB_IN_BYTES );29	define( 'GB_IN_BYTES', 1024 * MB_IN_BYTES );30	define( 'TB_IN_BYTES', 1024 * GB_IN_BYTES );31	define( 'PB_IN_BYTES', 1024 * TB_IN_BYTES );32	define( 'EB_IN_BYTES', 1024 * PB_IN_BYTES );33	define( 'ZB_IN_BYTES', 1024 * EB_IN_BYTES );34	define( 'YB_IN_BYTES', 1024 * ZB_IN_BYTES );35	/**#@-*/36 37	// Start of run timestamp.38	if ( ! defined( 'WP_START_TIMESTAMP' ) ) {39		define( 'WP_START_TIMESTAMP', microtime( true ) );40	}41 42	$current_limit     = ini_get( 'memory_limit' );43	$current_limit_int = wp_convert_hr_to_bytes( $current_limit );44 45	// Define memory limits.46	if ( ! defined( 'WP_MEMORY_LIMIT' ) ) {47		if ( false === wp_is_ini_value_changeable( 'memory_limit' ) ) {48			define( 'WP_MEMORY_LIMIT', $current_limit );49		} elseif ( is_multisite() ) {50			define( 'WP_MEMORY_LIMIT', '64M' );51		} else {52			define( 'WP_MEMORY_LIMIT', '40M' );53		}54	}55 56	if ( ! defined( 'WP_MAX_MEMORY_LIMIT' ) ) {57		if ( false === wp_is_ini_value_changeable( 'memory_limit' ) ) {58			define( 'WP_MAX_MEMORY_LIMIT', $current_limit );59		} elseif ( -1 === $current_limit_int || $current_limit_int > 256 * MB_IN_BYTES ) {60			define( 'WP_MAX_MEMORY_LIMIT', $current_limit );61		} elseif ( wp_convert_hr_to_bytes( WP_MEMORY_LIMIT ) > 256 * MB_IN_BYTES ) {62			define( 'WP_MAX_MEMORY_LIMIT', WP_MEMORY_LIMIT );63		} else {64			define( 'WP_MAX_MEMORY_LIMIT', '256M' );65		}66	}67 68	// Set memory limits.69	$wp_limit_int = wp_convert_hr_to_bytes( WP_MEMORY_LIMIT );70	if ( -1 !== $current_limit_int && ( -1 === $wp_limit_int || $wp_limit_int > $current_limit_int ) ) {71		ini_set( 'memory_limit', WP_MEMORY_LIMIT );72	}73 74	if ( ! isset( $blog_id ) ) {75		$blog_id = 1;76	}77 78	if ( ! defined( 'WP_CONTENT_DIR' ) ) {79		define( 'WP_CONTENT_DIR', ABSPATH . 'wp-content' ); // No trailing slash, full paths only - WP_CONTENT_URL is defined further down.80	}81 82	/*83	 * Add define( 'WP_DEVELOPMENT_MODE', 'core' ), or define( 'WP_DEVELOPMENT_MODE', 'plugin' ), or84	 * define( 'WP_DEVELOPMENT_MODE', 'theme' ), or define( 'WP_DEVELOPMENT_MODE', 'all' ) to wp-config.php85	 * to signify development mode for WordPress core, a plugin, a theme, or all three types respectively.86	 */87	if ( ! defined( 'WP_DEVELOPMENT_MODE' ) ) {88		define( 'WP_DEVELOPMENT_MODE', '' );89	}90 91	// Add define( 'WP_DEBUG', true ); to wp-config.php to enable display of notices during development.92	if ( ! defined( 'WP_DEBUG' ) ) {93		if ( wp_get_development_mode() || 'development' === wp_get_environment_type() ) {94			define( 'WP_DEBUG', true );95		} else {96			define( 'WP_DEBUG', false );97		}