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<?php $arr = array( array( 'countryid' => 38 ), array( 'currency' => 'GBP', 'countryid' => 109 ), array( 'currency' => 'GBP', 'countryid' => 136 ), array( 'currency' => 'GBP', 'countryid' => 94 ), array( 'currency' => 'GBP') ); $map = array_combine(array_map(function($v){ return $v['countryid']; }, $arr), $arr); print_r($map);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined array key "countryid" in /in/354Sg on line 11 Array ( [38] => Array ( [countryid] => 38 ) [109] => Array ( [currency] => GBP [countryid] => 109 ) [136] => Array ( [currency] => GBP [countryid] => 136 ) [94] => Array ( [currency] => GBP [countryid] => 94 ) [] => Array ( [currency] => GBP ) )

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