Question

if ("false" == 0) echo "true\n";
// => true

While PHP documentation says:

var_dump((bool) "false");   // bool(true)

If it is a bug where can I file it?

Answer 1

Nope, not a bug. Don’t bother filing it.

This seemingly inconsistent behavior has nothing to do with the word “false”. It has to do with your string consisting of only letters and no numeric digits, so when it gets cast to an integer for comparison (== 0), it results in 0, making 0 == 0 which evaluates to true.

If you compare any other alphabetic string to 0, you’ll get the same result:

"abcd" == 0
"a" == 0
"true" == 0