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<?php $key = '价格'; $doc = []; $value=$doc[$key] = null; var_dump($doc); if(is_numeric($value)) $doc[$key] = floatval($value); else unset($doc[$key]); var_dump($doc);
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { ["价格"]=> NULL } array(0) { }

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