In PHP 3.0 boolean evaluation is short-circuited. This means that
in an expression like (1 || test_me()), the
function test_me() would not be executed since
nothing can change the result of the expression after the
1.
This is a minor compatibility issue, but may cause unexpected
side-effects.
Php migration.booleval Function syntax tag
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Php migration.booleval syntax tutorial
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