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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code | 
|---|---|
| 343 |       *         An array of cron request arguments. | 
| 344 |       * | 
| 345 |       *         @type int  $timeout   The request timeout in seconds. Default .01 seconds. | 
| 346 |       *         @type bool $blocking  Whether to set blocking for the request. Default false. | 
| 347 |       *         @type bool $sslverify Whether SSL should be verified for the request. Default false. | 
| 348 |       *     } | 
| 349 |       * } | 
| 350 |       * @param string $doing_wp_cron The unix timestamp of the cron lock. | 
| 351 |       */ | 
| 352 |      $cron_request = apply_filters( 'cron_request', array( | 
| 353 |           'url'  => add_query_arg( 'doing_wp_cron', $doing_wp_cron, site_url( 'wp-cron.php' ) ), | 
| 354 |           'key'  => $doing_wp_cron, | 
| 355 |           'args' => array( | 
| 356 |                'timeout'   => 0.01, | 
| 357 |                'blocking'  => false, | 
| 358 |                /** This filter is documented in wp-includes/class-wp-http-streams.php */ | 
| 359 |                'sslverify' => apply_filters( 'https_local_ssl_verify', false ) | 
| 360 |           ) | 
| 361 |      ), $doing_wp_cron ); |