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<?php $a=unserialize('a:1:{i:0;a:2:{s:11:"institut_id";s:9:"870500001";s:4:"name";s:12:"SPK Chemnitz";}}'); $a[] = array('institut_id'=>"870520001",'name'=>'SPK Mittelsachsen'); var_dump($a);
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.21, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(2) { [0]=> array(2) { ["institut_id"]=> string(9) "870500001" ["name"]=> string(12) "SPK Chemnitz" } [1]=> array(2) { ["institut_id"]=> string(9) "870520001" ["name"]=> string(17) "SPK Mittelsachsen" } }

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