Create print_arr_helper.php

This is awesome helper with below features:
1. mpr():Print array result in <pre></pre> [Thanks to Vrushank]
2. mprd(): Print array result in <pre></pre> and exit [Thanks to Vrushank]
3. mvr(): Print array result in <pre>var_dump</pre> and exit [Thanks to Vrushank]
4. array_pluck: pluck particular element values
5. permutation_array: permutations of conditions,[Please check feasibility of your requirement.]