Joshua Holden Turner:

• Joshua: /ˈdʒɒʃuə/ or /ˈdʒɑːʃuə/ (depending on accent; the first is more common in British English, the second in American English). This could also be represented as JOSH-oo-uh or JOSH-ah.

• Holden: /ˈhoʊldən/ (American English) or /ˈhəʊldən/ (British English). This could be represented as HO-lduhn or HOL-den.

• Turner: /ˈtɜːrnər/ (British English) or /ˈtɝːnər/ (American English). This could be represented as TURN-er.

Therefore, a comprehensive phonetic spelling of "Joshua Holden Turner" could be presented in several ways, depending on the desired level of detail and the target audience's familiarity with phonetic transcription:

• Option 1 (Simplified): JOSH-oo-uh HOL-den TURN-er

• Option 2 (More detailed, using IPA-like approximations): /ˈdʒɒʃuə/ /ˈhoʊldən/ /ˈtɜːrnər/ (Note: This assumes a British English pronunciation. American English would use slightly different symbols).

• Option 3 (Syllable-based): JOSH-oo-uh HO-lden TURN-er

The best option depends on the context. For a quick, easily understood phonetic guide, Option 1 or 3 might suffice. For a more precise representation for linguistic purposes, Option 2 would be preferable.