Boolean (Boolean) type in PHP _php tutorial

When converted to Boolean, the following values are considered FALSE:

The Boolean value of FALSE itself

The integer value 0 (0)

The floating-point value 0.0 (0)

An empty string, and the string "0"

An array that does not include any elements

Objects that do not include any member variables (PHP 4.0 only applies)

Special type NULL (including variables that have not been set)

SimpleXML object generated from an XML document without any tags (tags)

All other values are considered TRUE (including any resources).

Warning
-1 and other non-0 values (either positive or negative) are considered to be true!
Copy the Code code as follows:
Var_dump ((BOOL) ""); BOOL (FALSE)
Var_dump ((bool) 1); BOOL (TRUE)
Var_dump ((BOOL)-2); BOOL (TRUE)
Var_dump ((bool) "foo"); BOOL (TRUE)
Var_dump ((bool) 2.3e5); BOOL (TRUE)
Var_dump ((BOOL) array (12)); BOOL (TRUE)
Var_dump ((bool) array ()); BOOL (FALSE)
Var_dump ((BOOL) "false"); BOOL (TRUE)

Boolean to string when,true=>1,false=> "";

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