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<?php $arr = [ 10 => [ 'fieldId' => 'OR', 'type' => 'T', 'value' => 'Pos', ], 11 => [ 'fieldId' => 'ORStreet', 'type' => 'TEXT', 'value' => 'Postbus 52', ], 12 => [ 'fieldId' => 'OR', 'type' => 'T', 'value' => 'Pos', ] ]; $index = array_flip(array_map(function($val){ return $val["fieldId"]; }, $arr)); echo $index["ORStreet"];
Output for git.master, git.master_jit, rfc.property-hooks
11

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