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<?php function a () { static $b = null; if (is_null($b)) { echo 'Doing work.'; $b = 'blop'; } return $b; } var_dump(a()); var_dump(a()); var_dump(a()); var_dump(a()); var_dump(a()); var_dump(a()); var_dump(a()); var_dump(a());
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Doing work.string(4) "blop" string(4) "blop" string(4) "blop" string(4) "blop" string(4) "blop" string(4) "blop" string(4) "blop" string(4) "blop"