php: fixes JSON encoding issue, patch from Greg Dove. Close issue #1463

git-svn-id: http://haxe.googlecode.com/svn/trunk@6156 f16182fa-f095-11de-8f43-4547254af6c6
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git-svn-id: http://haxe.googlecode.com/svn/trunk@6157 f16182fa-f095-11de-8f43-4547254af6c6
php: fixed issue with extern members generated

git-svn-id: http://haxe.googlecode.com/svn/trunk@6158 f16182fa-f095-11de-8f43-4547254af6c6
php: fixed bug in getClassFields returning __properties__

git-svn-id: http://haxe.googlecode.com/svn/trunk@6159 f16182fa-f095-11de-8f43-4547254af6c6
php: fixed rpad,lpad,replace,htmlUnescape issues (thx Greg)

git-svn-id: http://haxe.googlecode.com/svn/trunk@6160 f16182fa-f095-11de-8f43-4547254af6c6