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run code in 200+ php & hhvm versions
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<?php $states = array( 'AL'=>'Alabama', 'AK'=>'Alaska', 'AZ'=>'Arizona', 'AR'=>'Arkansas', 'CA'=>'California', 'CO'=>'Colorado', 'CT'=>'Connecticut', 'DE'=>'Delaware', 'DC'=>'District of Columbia', 'FL'=>'Florida', 'GA'=>'Georgia', 'HI'=>'Hawaii', 'ID'=>'Idaho', 'IL'=>'Illinois', 'IN'=>'Indiana', 'IA'=>'Iowa', 'KS'=>'Kansas', 'KY'=>'Kentucky', 'LA'=>'Louisiana', 'ME'=>'Maine', 'MD'=>'Maryland', 'MA'=>'Massachusetts', 'MI'=>'Michigan', 'MN'=>'Minnesota', 'MS'=>'Mississippi', 'MO'=>'Missouri', 'MT'=>'Montana', 'NE'=>'Nebraska', 'NV'=>'Nevada', 'NH'=>'New Hampshire', 'NJ'=>'New Jersey', 'NM'=>'New Mexico', 'NY'=>'New York', 'NC'=>'North Carolina', 'ND'=>'North Dakota', 'OH'=>'Ohio', 'OK'=>'Oklahoma', 'OR'=>'Oregon', 'PA'=>'Pennsylvania', 'RI'=>'Rhode Island', 'SC'=>'South Carolina', 'SD'=>'South Dakota', 'TN'=>'Tennessee', 'TX'=>'Texas', 'UT'=>'Utah', 'VT'=>'Vermont', 'VA'=>'Virginia', 'WA'=>'Washington', 'WV'=>'West Virginia', 'WI'=>'Wisconsin', 'WY'=>'Wyoming', ); echo json_encode($states);
Output for 5.6.0 - 5.6.30, hhvm-3.12.14 - 3.17.3, 7.0.0 - 7.3.0rc3
{"AL":"Alabama","AK":"Alaska","AZ":"Arizona","AR":"Arkansas","CA":"California","CO":"Colorado","CT":"Connecticut","DE":"Delaware","DC":"District of Columbia","FL":"Florida","GA":"Georgia","HI":"Hawaii","ID":"Idaho","IL":"Illinois","IN":"Indiana","IA":"Iowa","KS":"Kansas","KY":"Kentucky","LA":"Louisiana","ME":"Maine","MD":"Maryland","MA":"Massachusetts","MI":"Michigan","MN":"Minnesota","MS":"Mississippi","MO":"Missouri","MT":"Montana","NE":"Nebraska","NV":"Nevada","NH":"New Hampshire","NJ":"New Jersey","NM":"New Mexico","NY":"New York","NC":"North Carolina","ND":"North Dakota","OH":"Ohio","OK":"Oklahoma","OR":"Oregon","PA":"Pennsylvania","RI":"Rhode Island","SC":"South Carolina","SD":"South Dakota","TN":"Tennessee","TX":"Texas","UT":"Utah","VT":"Vermont","VA":"Virginia","WA":"Washington","WV":"West Virginia","WI":"Wisconsin","WY":"Wyoming"}