[PHP-NOTES] note 130474 added to function.filter-var

Note that: when using FILTER_VALIDATE_INT, if the variable is zero, the "if" will be false.

<?php
$var = 0;

if (!filter_var($var, FILTER_VALIDATE_INT)){
    echo "Zero = false";
} else {
    echo 'Will not pass here";
}
?>
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