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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 5.6.0 - 5.6.27, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Array ( [0] => @if(param1>=7) [ something here @if(param1>9)[ nested statement ] ] [1] => @elseif(param2==true) [ 2st condition true ] [2] => @else [ default condition ] )

preferences:
201.19 ms | 407 KiB | 227 Q