This topic describes the syntax, description, parameters, return values, and examples of cache functions.

set_cache_ttl

This function is described as follows:
  • Syntax: set_cache_ttl(type, ttl)
  • Description

    You can call this function to set the cache duration for specific resources.

  • Parameters
    • type

      The cache type. Valid values: path and code.

    • ttl
      • If the type parameter is set to path, the ttl parameter specifies the cache duration for specific resources. The value must be an integer.
      • If the type parameter is set to code, the ttl parameter specifies the cache duration for specific response codes. The value must be a string.
      • Default unit for the cache duration: seconds.
  • Return values

    This function returns true upon a success and returns false upon a failure.

  • Examples 
    if match_re($uri, '^/image') {
    set_cache_ttl('code', '301=10,302=5')
}
Note: Set the cache durations for status codes responded to requests to URIs that start with "/image", 10 seconds for status code 301 and 5 seconds for status code 302.

if eq(substr($uri, -4, -1), '.mp4') {
    set_cache_ttl('path', 5)
}
if match_re($uri, '^/201801/mp4/') {
    set_cache_ttl('path', 50)
}
if match_re($uri, '^/201802/flv/') {
    set_cache_ttl('path', 10)
} 
Note: Set different cache durations for file names or URI paths.