Php to find out the number of input files within the specified range and the square root is also the number of input files _ PHP Tutorial

Php finds out the number of input files in the specified range and the square root is also the number of input files. Php to find the number of input files in a specified range and the square root is also the number of input files. This article mainly introduces php to find out the number of input files in a specified range and the square root is also the number of input files, the example analyzes the php method to find the number of input files in a specified range and the square root is also the number of input files.

This article mainly introduces php's method of finding out the number of input files within a specified range and the square root is also the number of input files. The example shows php's method of determining the number of input files, which has some reference value. For more information, see

This example describes how php can find the number of input files in a specified range and the square root is also the number of input files. Share it with you for your reference. The details are as follows:

I. requirements:

Two values X and Y are given to calculate the number of input values in this range, and the square root of them is required to be the number of input values. Where 1 <= x <= y <10 14

II. solution:

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Error_reporting (E_ALL ); Ini_set ("display_errors", 1 ); // Avoid timeout Set_time_limit (0 ); $ T1 = microtime (); Function isPlalindrome ($ num ){ $ Str = "$ num "; $ Len = strlen ($ num ); $ K = intval ($ len/2) + 1; // Obtain the middle digit For ($ j = 0; $ j <$ k; $ j ++ ){ If ($ str {$ j }! = $ Str {$ len-1-$ j }){ Return false; } } Return true; } Function showPlalindrome ($ min, $ max ){ // Because the value is calculated in $ min, the return number between $ max and its square root is also the return number. // Therefore, it is equivalent to obtaining a sqrt ($ min )~ Sqrt ($ max) No. // Its square value ranges from $ min ~ $ Max is also the number of replies // $ Min ~ $ Max is a continuous positive integer, so it can reduce a lot of computations, otherwise ...... $ Start = sqrt ($ min ); $ End = sqrt ($ max ); For ($ I = $ start; $ I <$ end; $ I ++ ){ If (isPlalindrome ($ I) & isPlalindrome ($ n = $ I * $ I )){ Echo $ n ." "; } } } ShowPlalindrome (1,00000000000000 ); $ T2 = microtime (); $ Starttime = explode ("", $ t1 ); $ Endtime = explode ("", $ t2 ); $ Totaltime = $ endtime [0]-$ starttime [0] + $ endtime [1]-$ starttime [1]; $ Timecost = sprintf ("% s", $ totaltime ); Echo "page Running time: $ timecost seconds "; ?>

I hope this article will help you with php programming.

This article describes how to find the number of input files in a specified range in php and the square root is also the number of input files...