PHP example: bool is_string(mixed)

$x = 7; if (is_string($x)) { echo "\$x contains a string\n."; // Never executed } else { echo "\$x does not contain a string\n."; } $x = "7"; if (is_string($x)) { echo "\$x contains a string\n."; } else { echo "\$x does not contain a string\n."; // Never executed }