3v4l.org

run code in 150+ php & hhvm versions
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<?php $cou = array("Afghanistan","Albania","Algeria","Andorra","Angola","Antigua & Deps","Argentina","Armenia","Australia","Austria","Azerbaijan","Bahamas","Bahrain","Bangladesh","Barbados","Belarus","Belgium","Belize","Benin","Bhutan","Bolivia","Bosnia Herzegovina","Botswana","Brazil","Brunei","Bulgaria","Burkina","Burundi","Cambodia","Cameroon","Canada","Cape Verde","Central African Rep","Chad","Chile","China","Colombia","Comoros","Congo","Congo {Democratic Rep}","Costa Rica","Croatia","Cuba","Cyprus","Czech Republic","Denmark","Djibouti","Dominica","Dominican Republic","East Timor","Ecuador","Egypt","El Salvador","Equatorial Guinea","Eritrea","Estonia","Ethiopia","Fiji","Finland","France","Gabon","Gambia","Georgia","Germany","Ghana","Greece","Grenada","Guatemala","Guinea","Guinea-Bissau","Guyana","Haiti","Honduras","Hungary","Iceland","India","Indonesia","Iran","Iraq","Ireland {Republic}","Israel","Italy","Ivory Coast","Jamaica","Japan","Jordan","Kazakhstan","Kenya","Kiribati","Korea North","Korea South","Kosovo","Kuwait","Kyrgyzstan","Laos","Latvia","Lebanon","Lesotho","Liberia","Libya","Liechtenstein","Lithuania","Luxembourg","Macedonia","Madagascar","Malawi","Malaysia","Maldives","Mali","Malta","Marshall Islands","Mauritania","Mauritius","Mexico","Micronesia","Moldova","Monaco","Mongolia","Montenegro","Morocco","Mozambique","Myanmar, {Burma}","Namibia","Nauru","Nepal","Netherlands","New Zealand","Nicaragua","Niger","Nigeria","Norway","Oman","Pakistan","Palau","Panama","Papua New Guinea","Paraguay","Peru","Philippines","Poland","Portugal","Qatar","Romania","Russian Federation","Rwanda","St Kitts & Nevis","St Lucia","Saint Vincent & the Grenadines","Samoa","San Marino","Sao Tome & Principe","Saudi Arabia","Senegal","Serbia","Seychelles","Sierra Leone","Singapore","Slovakia","Slovenia","Solomon Islands","Somalia","South Africa","South Sudan","Spain","Sri Lanka","Sudan","Suriname","Swaziland","Sweden","Switzerland","Syria","Taiwan","Tajikistan","Tanzania","Thailand","Togo","Tonga","Trinidad & Tobago","Tunisia","Turkey","Turkmenistan","Tuvalu","Uganda","Ukraine","United Arab Emirates","United Kingdom","United States","Uruguay","Uzbekistan","Vanuatu","Vatican City","Venezuela","Vietnam","Yemen","Zambia","Zimbabwe"); //print_r($cou); function filterarr($var) { echo strtolower($var); } print_r(array_filter($cou, "filterarr"));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
afghanistanalbaniaalgeriaandorraangolaantigua & depsargentinaarmeniaaustraliaaustriaazerbaijanbahamasbahrainbangladeshbarbadosbelarusbelgiumbelizebeninbhutanboliviabosnia herzegovinabotswanabrazilbruneibulgariaburkinaburundicambodiacamerooncanadacape verdecentral african repchadchilechinacolombiacomoroscongocongo {democratic rep}costa ricacroatiacubacyprusczech republicdenmarkdjiboutidominicadominican republiceast timorecuadoregyptel salvadorequatorial guineaeritreaestoniaethiopiafijifinlandfrancegabongambiageorgiagermanyghanagreecegrenadaguatemalaguineaguinea-bissauguyanahaitihondurashungaryicelandindiaindonesiairaniraqireland {republic}israelitalyivory coastjamaicajapanjordankazakhstankenyakiribatikorea northkorea southkosovokuwaitkyrgyzstanlaoslatvialebanonlesotholiberialibyaliechtensteinlithuanialuxembourgmacedoniamadagascarmalawimalaysiamaldivesmalimaltamarshall islandsmauritaniamauritiusmexicomicronesiamoldovamonacomongoliamontenegromoroccomozambiquemyanmar, {burma}namibianaurunepalnetherlandsnew zealandnicaraguanigernigerianorwayomanpakistanpalaupanamapapua new guineaparaguayperuphilippinespolandportugalqatarromaniarussian federationrwandast kitts & nevisst luciasaint vincent & the grenadinessamoasan marinosao tome & principesaudi arabiasenegalserbiaseychellessierra leonesingaporeslovakiasloveniasolomon islandssomaliasouth africasouth sudanspainsri lankasudansurinameswazilandswedenswitzerlandsyriataiwantajikistantanzaniathailandtogotongatrinidad & tobagotunisiaturkeyturkmenistantuvaluugandaukraineunited arab emiratesunited kingdomunited statesuruguayuzbekistanvanuatuvatican cityvenezuelavietnamyemenzambiazimbabweArray ( )