On 20 Feb 2014 at 12:28, Stuart Dallas <stuart@xxxxxxxx> wrote: > On 20 Feb 2014, at 12:25, Tim Streater <tim@xxxxxxxxxxxxxxxx> wrote: >> My question is, under what conditions can a variable be set by the PHP system >> to the string "undefined"? Would this require that my ajax call in the >> browser would have to have had something explicit like: >> >> ... &PTR_fcc=undefined … > > Not explicit as such, but that is what’s happening. Javascript will use the > string "undefined" whenever an undefined variable is concatenated on to a > string. Stuart, Thanks for that - that really narrows down where I need to look. -- Cheers -- Tim
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