Bug fix

Private method bug fixed

New method added

isStructureSame method added

New method added

isNumeric method added.

saveField method changed

saveField method now accepts 0 and '0' as valid values for id parameter and no longer throws an exception if either of those values is passed

New method added, deprecated methods removed

-countMaxDepthIterative method added
-deprecated methods haveEqualKeys & haveEqualValues removed
-integer validation improved
-countMaxDepth signature changed and method efficiency improved

New method added

selectRandomArrayElements method added.

New methods added, some methods depricated

haveSameKeys & haveSameValues methods added, they will replace haveEqualKeys & haveEqualValues respectively, which are depricated.
hasOnlyKeys method added & tested

Improvements & tests added

CastColumns method allows for empty $matrix input, without throwing an exception.
Tests code coverage improved to 100%.
Changelog file added.

Delete columns method added.

Delete columns method added.

3 new methods added

Methods added (tests included):
-addConfigRow
-insertSubArray
-setColumn
Method castColumns tested