PHP example: bool is_finite(float)

$x = 0; if(is_finite($x)) { echo "The value of \$x ($x) is PHP finite.\n"; } else { echo "The value of \$x ($x) is not PHP finite.\n"; // Never executed } $x = log(0); // evaluates to -INF if(is_finite($x)) { echo "The value of \$x ($x) is PHP finite.\n"; // Never executed } else { echo "The value of \$x ($x) is not PHP finite.\n"; }