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wp_clear_scheduled_hook ( $hook, $args = array(), $wp_error = false )
wp_clear_scheduled_hook: 这是一个从cron计划中清除一个预定事件的函数。它可以用来取消一个预定的事件。
取消附着在钩子上的所有事件,并指定参数。
警告: 这个函数可能会返回布尔值FALSE,但也可能会返回一个评估为FALSE的非布尔值。关于向布尔值转换的信息请参见{@link PHP documentation}。使用`===`操作符来测试此函数的返回值。
function wp_clear_scheduled_hook( $hook, $args = array(), $wp_error = false ) { // Backward compatibility. // Previously, this function took the arguments as discrete vars rather than an array like the rest of the API. if ( ! is_array( $args ) ) { _deprecated_argument( __FUNCTION__, '3.0.0', __( 'This argument has changed to an array to match the behavior of the other cron functions.' ) ); $args = array_slice( func_get_args(), 1 ); // phpcs:ignore PHPCompatibility.FunctionUse.ArgumentFunctionsReportCurrentValue.NeedsInspection $wp_error = false; } /** * Filter to preflight or hijack clearing a scheduled hook. * * Returning a non-null value will short-circuit the normal unscheduling * process, causing the function to return the filtered value instead. * * For plugins replacing wp-cron, return the number of events successfully * unscheduled (zero if no events were registered with the hook) or false * or a WP_Error if unscheduling one or more events fails. * * @since 5.1.0 * @since 5.7.0 The `$wp_error` parameter was added, and a `WP_Error` object can now be returned. * * @param null|int|false|WP_Error $pre Value to return instead. Default null to continue unscheduling the event. * @param string $hook Action hook, the execution of which will be unscheduled. * @param array $args Arguments to pass to the hook's callback function. * @param bool $wp_error Whether to return a WP_Error on failure. */ $pre = apply_filters( 'pre_clear_scheduled_hook', null, $hook, $args, $wp_error ); if ( null !== $pre ) { if ( $wp_error && false === $pre ) { return new WP_Error( 'pre_clear_scheduled_hook_false', __( 'A plugin prevented the hook from being cleared.' ) ); } if ( ! $wp_error && is_wp_error( $pre ) ) { return false; } return $pre; } /* * This logic duplicates wp_next_scheduled(). * It's required due to a scenario where wp_unschedule_event() fails due to update_option() failing, * and, wp_next_scheduled() returns the same schedule in an infinite loop. */ $crons = _get_cron_array(); if ( empty( $crons ) ) { return 0; } $results = array(); $key = md5( serialize( $args ) ); foreach ( $crons as $timestamp => $cron ) { if ( isset( $cron[ $hook ][ $key ] ) ) { $results[] = wp_unschedule_event( $timestamp, $hook, $args, true ); } } $errors = array_filter( $results, 'is_wp_error' ); $error = new WP_Error(); if ( $errors ) { if ( $wp_error ) { array_walk( $errors, array( $error, 'merge_from' ) ); return $error; } return false; } return count( $results ); }