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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; } ?>
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0, 5.6.2 - 5.6.9, 5.6.11 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.26, 7.3.0 - 7.3.13, 7.4.0 - 7.4.1
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 )
Output for 5.6.1
<pre>Array ( [0] => acst [1] => act [2] => addt [3] => admt [4] => adt [5] => aft [6] => ahdt [7] => ahst [8] => akdt [9] => akst [10] => aktst [11] => aktt [12] => almst [13] => almt [14] => amst [15] => amt [16] => anast [17] => anat [18] => ant [19] => aot [20] => apt [21] => aqtst [22] => aqtt [23] => arst [24] => art [25] => ashst [26] => asht [27] => ast [28] => awt [29] => azomt [30] => azost [31] => azot [32] => azst [33] => azt [34] => bakst [35] => bakt [36] => bdst [37] => bdt [38] => beat [39] => beaut [40] => bmt [41] => bnt [42] => bortst [43] => bort [44] => bost [45] => bot [46] => brst [47] => brt [48] => bst [49] => btt [50] => burt [51] => cant [52] => capt [53] => cast [54] => cat [55] => cawt [56] => cct [57] => cddt [58] => cdt [59] => cemt [60] => cest [61] => cet [62] => cgst [63] => cgt [64] => chadt [65] => chast [66] => chat [67] => chdt [68] => chost [69] => chot [70] => chut [71] => cit [72] => cjt [73] => ckhst [74] => ckt [75] => clst [76] => clt [77] => cmt [78] => cost [79] => cot [80] => cpt [81] => cst [82] => cut [83] => cvst [84] => cvt [85] => cwst [86] => cwt [87] => cxt [88] => chst [89] => dact [90] => davt [91] => ddut [92] => dmt [93] => dusst [94] => dust [95] => easst [96] => east [97] => eat [98] => ect [99] => eddt [100] => edt [101] => eest [102] => eet [103] => egst [104] => egt [105] => ehdt [106] => eit [107] => emt [108] => ept [109] => est [110] => ewt [111] => ffmt [112] => fjst [113] => fjt [114] => fkst [115] => fkt [116] => fmt [117] => fnst [118] => fnt [119] => fort [120] => frust [121] => frut [122] => galt [123] => gamt [124] => gbgt [125] => gest [126] => get [127] => gft [128] => ghst [129] => gilt [130] => gmt [131] => gst [132] => gyt [133] => hadt [134] => hast [135] => hdt [136] => hkst [137] => hkt [138] => hmt [139] => hovst [140] => hovt [141] => hpt [142] => hst [143] => hwt [144] => ict [145] => iddt [146] => idt [147] => ihst [148] => imt [149] => iot [150] => irdt [151] => irkst [152] => irkt [153] => irst [154] => isst [155] => ist [156] => javt [157] => jdt [158] => jmt [159] => jst [160] => kart [161] => kast [162] => kdt [163] => kgst [164] => kgt [165] => kizst [166] => kizt [167] => kmt [168] => kost [169] => krast [170] => krat [171] => kst [172] => kuyst [173] => kuyt [174] => kwat [175] => lhst [176] => lint [177] => lkt [178] => lmt [179] => lont [180] => lrt [181] => lst [182] => madmt [183] => madst [184] => madt [185] => magst [186] => magt [187] => malst [188] => malt [189] => mart [190] => mawt [191] => mddt [192] => mdst [193] => mdt [194] => mest [195] => met [196] => mht [197] => mist [198] => mmt [199] => most [200] => mot [201] => mpt [202] => msd [203] => msk [204] => mst [205] => must [206] => mut [207] => mvt [208] => mwt [209] => myt [210] => ncst [211] => nct [212] => nddt [213] => ndt [214] => negt [215] => nest [216] => net [217] => nft [218] => nmt [219] => novst [220] => novt [221] => npt [222] => nrt [223] => nst [224] => nut [225] => nwt [226] => nzdt [227] => nzmt [228] => nzst [229] => omsst [230] => omst [231] => orast [232] => orat [233] => pddt [234] => pdt [235] => pest [236] => petst [237] => pett [238] => pet [239] => pgt [240] => phot [241] => phst [242] => pht [243] => pkst [244] => pkt [245] => pmdt [246] => pmst [247] => pmt [248] => pnt [249] => pont [250] => ppmt [251] => ppt [252] => pst [253] => pwt [254] => pyst [255] => pyt [256] => qmt [257] => qyzst [258] => qyzt [259] => ret [260] => rmt [261] => rott [262] => sakst [263] => sakt [264] => samst [265] => samt [266] => sast [267] => sbt [268] => sct [269] => sdmt [270] => sgt [271] => shest [272] => shet [273] => sjmt [274] => slst [275] => smt [276] => srt [277] => sst [278] => stat [279] => svest [280] => svet [281] => swat [282] => syot [283] => taht [284] => tasst [285] => tast [286] => tbist [287] => tbit [288] => tbmt [289] => tft [290] => tjt [291] => tkt [292] => tlt [293] => tmt [294] => tost [295] => tot [296] => trst [297] => trt [298] => tsat [299] => tvt [300] => uct [301] => ulast [302] => ulat [303] => urast [304] => urat [305] => urut [306] => utc [307] => uyhst [308] => uyst [309] => uyt [310] => uzst [311] => uzt [312] => vet [313] => vlasst [314] => vlast [315] => vlat [316] => volst [317] => volt [318] => vost [319] => vust [320] => vut [321] => wakt [322] => warst [323] => wart [324] => wast [325] => wat [326] => wemt [327] => west [328] => wet [329] => wft [330] => wgst [331] => wgt [332] => wit [333] => wmt [334] => wsdt [335] => wst [336] => yakst [337] => yakt [338] => yddt [339] => ydt [340] => yekst [341] => yekt [342] => yerst [343] => yert [344] => ypt [345] => yst [346] => ywt [347] => a [348] => b [349] => c [350] => d [351] => e [352] => f [353] => g [354] => h [355] => i [356] => k [357] => l [358] => m [359] => n [360] => o [361] => p [362] => q [363] => r [364] => s [365] => t [366] => u [367] => v [368] => w [369] => x [370] => y [371] => zzz [372] => z )

preferences:
204.41 ms | 417 KiB | 242 Q