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<?php print_r(preg_split("~@(?>if|else(?>if)?)\s*(?>\([^()]*+\)\s*)?\[(?:[^][@]*+(?>\\.[^][@]*)*(@+(?!(?>if|else(?>if)?)))?|(?R))*\]\K\s*~", "@if(param1>=7) [ something here @if(param1>9)[ nested statement ] ] @elseif(param2==true) [ 2st condition true ] @else [ default condition ]", -1, PREG_SPLIT_NO_EMPTY));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => @if(param1>=7) [ something here @if(param1>9)[ nested statement ] ] [1] => @elseif(param2==true) [ 2st condition true ] [2] => @else [ default condition ] )

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