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<?php $json1 =' { "error": "trueee", "info": { "collections": [{ "ID": "1" }, { "ID": "36" }, { "ID": "2" }] } } '; $json2 =' { "error": "trueee", "info": { "collections": [{ "ID": "12" }, { "ID": "6" }, { "ID": "16" }] } } '; $arr1 = json_decode($json1, true); $arr2 = json_decode($json2, true); $arr1 = array_column($arr1['info']['collections'], "ID"); $arr2 = array_column($arr2['info']['collections'], "ID"); $arr = array_merge($arr1, $arr2); sort($arr); echo '<pre>'; print_r($arr);
Output for git.master, git.master_jit, rfc.property-hooks
<pre>Array ( [0] => 1 [1] => 2 [2] => 6 [3] => 12 [4] => 16 [5] => 36 )

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