There are reasons to use this routine. I can think of two:
- a busy website will have multiple web servers, and before one is brought online (via load balancer), the cache is built. This prevents problems of having too many cache misses in a short period on your entire code base, which could be massive, and cause problems.
- a website where the apc.stat flag is set to zero. That setting provides significant performance savings because no 'stat' needs to be performed on PHP code files. But they are not automatically rebuilt when changed. So what do you do when your code changes? Restart Apache, or manually clearing the APC cache with apc_clear_cache() - but both will clear the entire cache. There may be cases where it is much better to recompile select files instead. Some sites store data (that rarely changes) in PHP code to make good use of the opcode cache, updating that file and selectively compiling it would make writes efficient too.
PHP - Manual: apc_compile_file
2024-12-23
apc_compile_file
(PECL apc >= 3.0.13)
apc_compile_file — Stores a file in the bytecode cache, bypassing all filters
说明
Stores a file in the bytecode cache, bypassing all filters.
å‚æ•°
-
filename -
Full or relative path to a PHP file that will be compiled and stored in the bytecode cache.
返回值
æˆåŠŸæ—¶è¿”回 TRUE， 或者在失败时返回 FALSE。
å‚è§
- apc_bin_dumpfile() - Output a binary dump of cached files and user variables to a file
- apc_bin_loadfile() - Load a binary dump from a file into the APC file/user cache
add a note
User Contributed Notes 2 notes
Glen ¶
10 years ago
Andrea Giammarchi ¶
11 years ago
This is a simple way to cache a project entirely.
<?php // apc_compile_dir.php
function apc_compile_dir($root, $recursively = true){
$compiled = true;
switch($recursively){
case true:
foreach(glob($root.DIRECTORY_SEPARATOR.'*', GLOB_ONLYDIR) as $dir)
$compiled = $compiled && apc_compile_dir($dir, $recursively);
case false:
foreach(glob($root.DIRECTORY_SEPARATOR.'*.php') as $file)
$compiled = $compiled && apc_compile_file($file);
break;
}
return $compiled;
}
?>
This is an example on how to use the function to compile your project.
<?php
echo '<pre>'.PHP_EOL;
if(function_exists('apc_compile_file')){
define('APC_CLEAR_CACHE', true);
define('APC_COMPILE_RECURSIVELY', true);
define('APC_COMPILE_DIR', '.');
require 'apc_compile_dir.php';
echo 'APC Directory Compiler '.gmdate('Y-m-d H:i:s').PHP_EOL;
echo PHP_EOL.'-------------------------'.PHP_EOL;
if(APC_CLEAR_CACHE){
echo (apc_clear_cache() ? 'Cache Cleaned' : 'Cache Not Cleaned').PHP_EOL;
var_dump(apc_cache_info());
echo PHP_EOL.'-------------------------'.PHP_EOL;
}
echo 'Runtime Errors'.PHP_EOL;
echo (apc_compile_dir(APC_COMPILE_DIR, APC_COMPILE_RECURSIVELY) ? 'Cache Created' : 'Cache Not Created').PHP_EOL;
echo PHP_EOL.'-------------------------'.PHP_EOL;
var_dump(apc_cache_info());
}
else
echo 'APC is not present, nothing to do.'.PHP_EOL;
echo '</pre>';
?>
官方地址：https://www.php.net/manual/en/function.apc-compile-file.php
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