Other types in PHP are converted to the Bool type.

This article summarizes some situations when PHP is transitioned to Boolean (bool). It is very simple. if you need it, you can refer to the following questions: in PHP, if (true = 2) will return true or false?

The result is true. in this case, I will test other php Data types.

Conclusion:

When converted to the bool type, the following data types are converted to false:

1. integer 0

2. empty string

3. empty array

4. NULL

Please add...

Test code:

<? Phpfunction p ($ title, $ mybool) {echo"
". $ Title; echo var_dump ($ mybool )."
";} Class foo {function do_foo () {echo" Hello! ";}} Echo"
Convert other types in PHP to Bool type
"; // Zero $ n0 = boolval (0); p (" zero: ", $ n0); // positive integer $ n = boolval (2); p (" positive integer: ", $ n); // negative integer $ nx = boolval (-2); p (" negative integer: ", $ nx ); // character space $ ss = boolval (""); p ("character space:", $ ss); // empty string $ sn = boolval (""); p ("null string:", $ sn); // String $ s = boolval ("chinacion"); p ("string:", $ s ); // empty array $ an = boolval (array (); p ("empty array:", $ ); // array $ a = boolval (array (0 => 1); p ("array:", $ a); // null type $ nu = boolval (NULL ); p ("NULL:", $ nu); // object $ bar = new foo; $ bar; $ obj = boolval ($ bar); p ("Object :", $ obj );