Incompatibility with PHP 5.5.11 due to bug in this php version

[mattab]

See report in the forum; substr_compare is buggy on 5.5.11 and we could try put in a workaround.

Maybe this causes this other problem? #5058

[mattab]

Travis upgraded PHP to 5.5.11 and the the bug fails some test in AssetManagerTest in the build too

[mattab]

See also: #5058 asset 404 error for ui-bg_flat_75_ffffff_40x100.png

[mattab]

In f7f5296: Refs #5060 Remove use of substr_compare as it's buggy in 5.5.11 with negative offset

[tsteur]

Can we close this one?