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Bitwise &= for multiple boolean checks

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gistfile1.php
PHP
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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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