[BUG] Parse error on PHP versions < 5.6

[prbt2016]

Description

After successful setup of SimplePie version 1.5.3(downloaded using git clone) on PHP 5.3.29, I encountered with the following Parse error i.e

Parse error: syntax error, unexpected '*' in /{{path}}/{{to}}/{{simplepie}}/library/SimplePie/Parse/Date.php on line 727

Steps to Reproduce

Steps to reproduce the behavior:

1. Try to add any valid RSS feed URL or visit any of the given RSS feed URL's .
2. After visiting you will get the above error if PHP version is less than 5.6 and RSS feed wont be loaded.

Environment

SimplePie version - 1.5.3
PHP version - 5.3.29
Apache version -2.2.34
O.S - Centos 6.4 Final

####Cause
On line 127 is the following code i.e $second = round((int)$match[6] + (int)$match[7] / (10 ** strlen($match[7]))); . The symbol '**' is supported since PHP 5.6.0 and minimum mentioned requirement here :
https://github.com/simplepie/simplepie is 5.3.0+.

Has the script requirement changed to PHP 5.6 or could you please fix this by adding a fix for PHP versions less than 5.6 by using pow() function that was used earlier ?

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[mblaney]

thanks @prbt2016 SimplePie now requires PHP 5.6 or newer.