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$x = 0; if(is_finite($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"; }