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<?php $pos = strpos('PHP 5.6.10', phpversion()); if($pos !== false){ print "<pre>"; $arr = timezone_abbreviations_list(); print_r(array_keys($arr)); die; } ?>
based on uQXNo
Output for 5.3.18 - 5.6.9, 5.6.11 - 7.2.0
Output for 5.6.10
<pre>Array ( [0] => acdt [1] => acst [2] => act [3] => acwdt [4] => acwst [5] => addt [6] => admt [7] => adt [8] => aedt [9] => aest [10] => aft [11] => ahdt [12] => ahst [13] => akdt [14] => akst [15] => aktst [16] => aktt [17] => almst [18] => almt [19] => amst [20] => amt [21] => anast [22] => anat [23] => ant [24] => aot [25] => apt [26] => aqtst [27] => aqtt [28] => arst [29] => art [30] => ashst [31] => asht [32] => ast [33] => awdt [34] => awst [35] => awt [36] => azomt [37] => azost [38] => azot [39] => azst [40] => azt [41] => bakst [42] => bakt [43] => bdst [44] => bdt [45] => beat [46] => beaut [47] => bmt [48] => bnt [49] => bortst [50] => bort [51] => bost [52] => bot [53] => brst [54] => brt [55] => bst [56] => btt [57] => burt [58] => cant [59] => capt [60] => cast [61] => cat [62] => cawt [63] => cct [64] => cddt [65] => cdt [66] => cemt [67] => cest [68] => cet [69] => cgst [70] => cgt [71] => chadt [72] => chast [73] => chdt [74] => chost [75] => chot [76] => chut [77] => ckhst [78] => ckt [79] => clst [80] => clt [81] => cmt [82] => cost [83] => cot [84] => cpt [85] => cst [86] => cut [87] => cvst [88] => cvt [89] => cwt [90] => cxt [91] => chst [92] => dact [93] => davt [94] => ddut [95] => dmt [96] => dusst [97] => dust [98] => easst [99] => east [100] => eat [101] => ect [102] => eddt [103] => edt [104] => eest [105] => eet [106] => egst [107] => egt [108] => ehdt [109] => emt [110] => ept [111] => est [112] => ewt [113] => fet [114] => ffmt [115] => fjst [116] => fjt [117] => fkst [118] => fkt [119] => fmt [120] => fnst [121] => fnt [122] => fort [123] => frust [124] => frut [125] => galt [126] => gamt [127] => gbgt [128] => gest [129] => get [130] => gft [131] => ghst [132] => gilt [133] => gmt [134] => gst [135] => gyt [136] => hadt [137] => hast [138] => hdt [139] => hkst [140] => hkt [141] => hmt [142] => hovst [143] => hovt [144] => hst [145] => ict [146] => iddt [147] => idt [148] => ihst [149] => imt [150] => iot [151] => irdt [152] => irkst [153] => irkt [154] => irst [155] => isst [156] => ist [157] => javt [158] => jcst [159] => jdt [160] => jmt [161] => jst [162] => jwst [163] => kart [164] => kdt [165] => kgst [166] => kgt [167] => kizst [168] => kizt [169] => kmt [170] => kost [171] => krast [172] => krat [173] => kst [174] => kuyst [175] => kuyt [176] => kwat [177] => lhdt [178] => lhst [179] => lint [180] => lkt [181] => lrt [182] => lst [183] => madmt [184] => madst [185] => madt [186] => magst [187] => magt [188] => malst [189] => malt [190] => mart [191] => mawt [192] => mddt [193] => mdst [194] => mdt [195] => mest [196] => met [197] => mht [198] => mist [199] => mmt [200] => most [201] => mot [202] => mpt [203] => msd [204] => msk [205] => msm [206] => mst [207] => must [208] => mut [209] => mvt [210] => mwt [211] => myt [212] => ncst [213] => nct [214] => nddt [215] => ndt [216] => negt [217] => nest [218] => net [219] => nft [220] => nmt [221] => novst [222] => novt [223] => npt [224] => nrt [225] => nst [226] => nut [227] => nwt [228] => nzdt [229] => nzmt [230] => nzst [231] => omsst [232] => omst [233] => orast [234] => orat [235] => pddt [236] => pdt [237] => pest [238] => petst [239] => pett [240] => pet [241] => pgt [242] => phot [243] => phst [244] => pht [245] => pkst [246] => pkt [247] => pmdt [248] => pmst [249] => pmt [250] => pnt [251] => pont [252] => ppmt [253] => ppt [254] => pst [255] => pwt [256] => pyst [257] => pyt [258] => qmt [259] => qyzst [260] => qyzt [261] => ret [262] => rmt [263] => rott [264] => sakst [265] => sakt [266] => samst [267] => samt [268] => sast [269] => sbt [270] => sct [271] => sdmt [272] => sdt [273] => sgt [274] => shest [275] => shet [276] => sjmt [277] => smt [278] => sret [279] => srt [280] => sst [281] => stat [282] => svest [283] => svet [284] => swat [285] => syot [286] => taht [287] => tasst [288] => tast [289] => tbist [290] => tbit [291] => tbmt [292] => tft [293] => tjt [294] => tkt [295] => tlt [296] => tmt [297] => tost [298] => tot [299] => trst [300] => trt [301] => tsat [302] => tvt [303] => uct [304] => ulast [305] => ulat [306] => urast [307] => urat [308] => utc [309] => uyhst [310] => uyst [311] => uyt [312] => uzst [313] => uzt [314] => vet [315] => vlast [316] => vlat [317] => volst [318] => volt [319] => vost [320] => vust [321] => vut [322] => wakt [323] => warst [324] => wart [325] => wast [326] => wat [327] => wemt [328] => west [329] => wet [330] => wft [331] => wgst [332] => wgt [333] => wib [334] => wita [335] => wit [336] => wmt [337] => wsdt [338] => wsst [339] => xjt [340] => yakst [341] => yakt [342] => yddt [343] => ydt [344] => yekst [345] => yekt [346] => yerst [347] => yert [348] => ypt [349] => yst [350] => ywt [351] => a [352] => b [353] => c [354] => d [355] => e [356] => f [357] => g [358] => h [359] => i [360] => k [361] => l [362] => m [363] => n [364] => o [365] => p [366] => q [367] => r [368] => s [369] => t [370] => u [371] => v [372] => w [373] => x [374] => y [375] => zzz [376] => z )