thinkphp function Learning (2)--microtime, Memory_get_usage, DirName, Strtolower, Is_file

1. Microtime ()

Returns the contents of this format for microsecond seconds

Example

<?phpecho (Microtime ());? > Output: 0.25139300 1138197510//Front is the microsecond section, but the unit is seconds. Back is the second.

2. Memory_get_usage

Returns the memory consumed by PHP in bytes

3. DirName

Returns the folder path where the page with this function is located, without a slash at the end

DirName (__file__)//output: D:\www

4. Strtolower literal meaning

5. Is_file

Determine if the file is true, the folder is False

thinkphp function Learning (2)--microtime, Memory_get_usage, DirName, Strtolower, Is_file