php-timeit estimates the execution time of php functions, php-timeitphp_PHP tutorial

php-timeit estimates the execution time of the php function, php-timeitphp

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Sometimes when we optimize PHP performance, we need to know the execution time of a certain function. In Python, there is the timeit module. Is there a similar module in PHP?

So, I wrote a simple timeit function myself, as follows:

/**
 * Compute the delay to execute a function a number of time
 * @param $count    Number of time that the tests will execute the given function
 * @param $function        the function to test. Can be a string with parameters (ex: 'myfunc(123, 0, 342)') or a callback
 * @return float            Duration in seconds (as a float)
 */
function timeit($count, $function<span>) {
    if ($count <= 0<span>){
        echo "Error: count have to be more than zero"<span>;
        return -1<span>;
    }
    
    $nbargs = func_num_args<span>();
    if ($nbargs < 2<span>) {
        echo 'Error: No Funciton!'<span>;
        echo 'Usage:'<span>;
        echo "\ttimeit(count, 'function(param)')"<span>;
        echo "\te.g:timeit(100, 'function(0,2)')"<span>;
        return -1;                        // no function to time
<span>    }
    
    // Generate callback
    $func = func_get_arg(1<span>);
    $func_name = current(explode('(', $func<span>));
    if (!function_exists($func_name<span>)) {
        echo 'Error: Unknown Function'<span>;
        return -1;                    // can't test unknown function
<span>    }
    
    $str_cmd = ''<span>;
    $str_cmd .= '$start = microtime(true);'<span>;
    $str_cmd .= 'for($i=0; $i<'.$count.'; $i++) '.$func.';'<span>;
    $str_cmd .= '$end = microtime(true);'<span>;
    $str_cmd .= 'return ($end - $start);'<span>;
    
    return eval($str_cmd<span>);
}</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

Test the execution time of a root-finding algorithm you wrote and the system’s built-in root-finding function, as follows:

//取平方根
function sqrt_nd($num<span>){
    $value = $num<span>;
    while(abs($value*$value -$num) > 0.001<span>){
        $value = ($value + $num/$value)/2<span>;
    }
    return $value<span>;
}


print timeit(1000, 'sqrt_nd(5)'<span>);
print "\n"<span>;
print timeit(1000, 'sqrt(5)');</span></span></span></span></span></span></span>

The test results are as follows:

0.028280019760132
0.0041000843048096

It can be seen that the built-in root function is more than 6 times faster than the custom root function~~

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