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<?php var_dump(pow(2, 8)); // int(256) echo pow(-1, 20); // 1 echo pow(0, 0); // 1 echo pow(10, -1); // 0.1 echo pow(-1, 5.5); // PHP >=5.2.2: NAN echo pow(-1, 5.5); // PHP <5.2.2: -NAN ?>