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Bitwise &= for multiple boolean checks

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<?php
function op($d){
return $d;
}
$ok = true;
$ok &= op(true);
$ok &= op(true);
$ok &= op(true);
var_dump((bool)$ok); // yields true because all op()s are true.
// another scenario
$ok = true;
$ok &= op(true);
$ok &= op(false);
$ok &= op(true);
var_dump((bool)$ok); // yields false because one of the op()s is false.
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