Using OB series functions to implement the static _php of PHP Web pages

The PHP execution page is pre-converted to HTML and is one of the so-called static PHP methods.

There are other methods, such as template substitution method, Opcache, etc.

The effect of static:

Improve the response speed of the website, reduce the load of the server;
SEO for the search engine;
The use of PHP output buffer directly written HTML, timed background time to scan the site, is relatively easy to achieve the static page.

Before Static:

<?phpfor ($i =0; $i <1000; $i + +) {echo "Bull
";}? >

Static:

<?phpob_start (); for ($i =0; $i <1000; $i + +) {echo "Bull
";} $str = Ob_get_contents (); Ob_end_clean () $fp = fopen ("test.html", "W"), Fwrite ($fp, $STR); fclose ($FP); echo "Success Write ";? >

The code will be pre-formed a test.html, white is actually used space in exchange for time, such as the news site, the content of the release basically finished is not changed, more suitable for static into HTML.

Direct to this HTML page when the user accesses it.

Simply test the effect with Apache benchmark:

Ab.exe-n1000-c10

The two are at least 150ms apart in connection with more than 90%. Compared to the complexity of PHP, HTML saves a lot of computational capacity.

Introduction to additional related functions

1, Flush: Flush the contents of the buffer, output.
function format: Flush ()
Description: This function is often used and is highly efficient.

2. Ob_start: Open Output buffer
function format: void Ob_start (void)
Note: When the buffer is active, all non-file header information from the PHP program is not sent, but is saved in the internal buffer. In order to output the contents of the buffer, you can use the contents of the Ob_end_flush () or flush () output buffers.

3. Ob_get_contents: Returns the contents of the internal buffer.
How to use: String ob_get_contents (void)
Description: This function returns the contents of the current buffer and returns FALSE if the output buffer is not activated.

4. Ob_get_length: Returns the length of the internal buffer.
How to use: int ob_get_length (void)
Note: This function returns the length of the current buffer, as with ob_get_contents, if the output buffer is not activated. FALSE is returned.

5. Ob_end_flush: Sends the contents of the internal buffer to the browser, and closes the output buffer.
How to use: void Ob_end_flush (void)
Description: This function sends the contents of the output buffer (if any).

6. Ob_end_clean: Delete the contents of the internal buffer and close the internal buffer
How to use: void Ob_end_clean (void)
Description: This function does not output the contents of the internal buffer but deletes it!

7. Ob_implicit_flush: Turn absolute refresh on or off
How to use: void Ob_implicit_flush ([int flag])
Description: People who have used Perl know the meaning of $|=x, this string can open/close the buffer, and the Ob_implicit_flush function is the same, the default is to close the buffer, open the absolute output, each script output is sent directly to the browser, no longer need to call flush ()。

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