Comparison of execution time of PHP isset() and empty() functions_PHP tutorial

The article uses charts to tell you about the comparison of PHP isset() and empty() function execution times and the performance of the functions. Friends in need can take a detailed look. The performance test uses Benchmark_Iterate class tools for debugging, focusing mainly on the execution time of isset() and empty() functions.

, Test environment
Operating system: Window isset() and empty are executed 50 times and generate a chart when the variable exists and does not exist

3. isset() and empty() determine when the variable does not exist

1, test code

Illustration: empty () determines that the variable does not exist. The average execution time is between 0.0010-0.0011 seconds 4. isset() and empty() determines that the variable exists

The code is as follows

Copy code

require_once "Benchmark/Iterate.php"; $bench = new Benchmark_Iterate;

代码如下	复制代码
require_once "Benchmark/Iterate.php"; $bench = new Benchmark_Iterate; function check1($var){     isset($var); } function check2($var){     !empty($var); } $bench->run(50,"check1",$var); //$bench->run(50,"check2",$var); $result = $bench->get();

function check1($var){

isset($var);
}

function check2($var){

!empty($var);

}

$bench->run(50,"check1",$var); //$bench-> run(50,"check2",$var);

$result = $bench->get();

where the $var variable is There is no initialization, and the execution performance of the two functions is as follows

2. isset() determines the case where the variable does not exist

代码如下	复制代码
require_once "Benchmark/Iterate.php"; $bench = new Benchmark_Iterate;   function check1($var){     isset($var); } function check2($var){     !empty($var); } $var = true; $bench->run(50,"check1",$var); //$bench->run(50,"check2",$var); $result = $bench->get();

Illustration: The average execution time of isset() when judging that the variable does not exist is between 0.0010-0.0011 seconds

3, and empty() when judging that the variable does not exist

, test code

The code is as follows

Copy code

require_once "Benchmark/Iterate.php"; $bench = new Benchmark_Iterate; function check1($var){ isset($var); } function check2 ($var){ !empty($var); } $var = true; $bench->run(50,"check1",$var); //$bench->run(50,"check2",$var); $result = $bench->get(); Initialization If the $var variable is true, determine the existence of the variable. The execution performance of the two functions is as follows 2, isset() determines the existence of the variable Illustration: isset() determines the existence of the variable The average execution time is between 0.0010-0.0011 seconds3. empty() determines the existence of a variable Illustration: isset() determines the existence of a variable. The average execution time is between 0.0010-0.0011 seconds. Based on the above test performance , it can be seen that the execution time of isset() and empty() functions is basically the same. The average execution time of the two functions is between 0.0010-0.0011 seconds. Of course, this is related to the specific environment. From the current test environment, the two functions Performance is the same. http://www.bkjia.com/PHPjc/444717.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/444717.htmlTechArticleThe article uses charts to tell you about the comparison of execution time and performance of PHP isset() and empty() functions. Bad, friends in need can take a look at it in detail. The performance test uses Benchmark_...