Use hidef instead of define in PHP to optimize efficiency

How to use hidef instead of define in PHP to optimize efficiency? This article mainly introduces the use of hidef extension instead of define in PHP to improve performance. This article focuses on testing the performance of hidef and provides examples. I hope to be helpful.

The website needed to add a new constant, so I opened the local config.php file and thought of the hidef and apc solutions I tested a few years ago to improve define performance.

My program has different configurations for the development, testing, and production servers. In terms of constants, I use an array to define all the constants that need to be defined, and then check whether there is an apc_load_constants function. If not, , batch define. When using apc, every time you add a constant, you need to modify $key to take effect.

Now after the test and production server php are upgraded to 5.4, the opcode cache uses Zend opcache and APC is no longer installed. Because the apc user cache is used, I installed apcu additionally, and the usage is exactly the same as apc, so there is no need to change the program at all. However, apcu does not support apc_load_constants and apc_define_constants, so the apc solution cannot be used. I went to the official website and installed the latest version of hidef 0.1.13, stable released on July 12, 2012, more than a year ago.

Write a simple program to test the define time. It takes about 2.8ms to run 1000 times. So for a medium-sized website (for example, PHP runs 10 million times a day), if 25 constants are defined per page, it will take about 10000000*25/1000*2.8=700000ms per day, which is 700 seconds. Using hidef can save almost 700s of PHP running time a day.

Let’s take a look at the reading performance. The test reads a constant 1w times, and the values ​​are all 1, which are 37ms and 0.7ms respectively. So if it is used 10 million times a day and an average of 20 constants are used per page, it will take 740 seconds, while using hidef is 14 seconds, well, another more than 700 seconds.

Saving 1400 seconds of PHP running time a day may be insignificant, but it is always good and worth trying. After all, the chance of defining parameters changing is very small.

When the define parameters need to be modified, just modify the configuration file and then reload php-fpm.

Attached is the original program sample code for configuring constants:

if (function_exists('apc_load_constants')) {
            function define_array($key, $arr, $case_sensitive = false) {
                if (!apc_load_constants($key, $case_sensitive)) {
                    apc_define_constants($key, $arr, $case_sensitive);
                }
            }
        } else {
            function define_array($key, $arr, $case_sensitive = false) {
                foreach ($arr as $name => $value) {
                    define($name, $value, $case_sensitive);
                }
            }
        }
        $constants = array(
            'HX'   => 1,
            'BLOG_URL'   => 'http://www.jb51.net/',
            'WWW_URL'   => 'http://www.jb51.net/',
        );
        define_array('hx_defined',$constants);

Attached is the code for testing the define speed.

 1,
        'hx2'       => '2',
        'hx3'       => '3',
        'hx4'       => '4',
        'hx5'       => '5',
        'hx6'       => '6',
        'hx7'       => '7',
        'hx8'       => '8',
        'hx9'       => '9',
        'hx10'       => '10',
    );
    function define_array($key, $arr) {
        foreach ($arr as $name => $value) {
            define($name.$i, $value);
        }
    }
    
    for($i=0;$i<100;$i++) {
        define_array($i,$constants);
    }
    
    
$t2 = microtime(1);
echo ($t2-$t1)*1000;
//读性能
$t1 = microtime(1);
for($i=0;$i<10000;$i++) {
    $t = hx1;
}    
$t2 = microtime(1);
echo ' '.($t2-$t1)*1000;
$t1 = microtime(1);
for($i=0;$i<10000;$i++) {
    $t = HX;
}    
$t2 = microtime(1);
echo ' '.($t2-$t1)*1000;

Related recommendations:

php constant definition problem

A summary of the concepts of php constants

Detailed introduction to the usage of php constants and variables

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