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I want to sort a flat, associative array by its values alphabetically and preserve the original keys. $arr = [ 0 => 'Newtown', 1 => 'Montgomery', 2 => 'Welshpool', 6 => 'Llanfyllin', 7 => 'Llansanffraid', 8 => 'Llanymynech', 9 => 'Oswestry', 14 => 'Oswestry Town Service', ]; would become [ 6 => 'Llanfyllin', 7 => 'Llansanffraid', 8 => 'Llanymynech', 1 => 'Montgomery', 0 => 'Newtown', 9 => 'Oswestry', 14 => 'Oswestry Town Service', 2 => 'Welshpool', ] Any ideas? Here's my full, actual array to sort: $arr = [ 0 => 'Newtown', 1 => 'Montgomery', 2 => 'Welshpool', 6 => 'Llanfyllin', 7 => 'Llansanffraid', 8 => 'Llanymynech', 9 => 'Oswestry', 14 => 'Oswestry Town Service', 15 => 'Aston Way', 16 => 'College Road', 17 => 'Shrewsbury', 18 => 'Royal Shrewsbury Hospital', 19 => 'Worthen', 20 => 'Brockton', 22 => 'Cefn Blodwell', 23 => 'Treflach', 24 => 'Trefonen', 25 => 'Morda', 26 => 'Marches School', 28 => 'North Shropshire College', 37 => 'Park Hall', 38 => 'Gobowen', 39 => 'St Martins', 40 => 'Ifton Heath', 42 => 'Guilsfield', 43 => 'Four Crosses', 45 => 'Pant', 46 => 'Llynclys', 49 => 'Oswestry Town Service Schools', 51 => 'Woodside School', 56 => 'Whittington', 57 => 'Babbinswood', 58 => 'Hindford', 59 => 'Ellesmere', 62 => 'Forden', 63 => 'Kingswood Cock Hotel', 65 => 'Coleg Powys', 85 => 'Borfa Green', 86 => 'Bryn Siriol', 87 => 'Maesydre School', 92 => 'Crew Green', 93 => 'Ford', 104 => 'Llanrhaeadr', 106 => 'Meifod', 114 => 'Llangynog', 116 => 'Llangedwyn

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