PHP 7.2.0 Release Candidate 4 Released

Booleans

This is the simplest type. A boolean expresses a truth value. It can be either TRUE or FALSE.

Syntax

To specify a boolean literal, use the constants TRUE or FALSE. Both are case-insensitive.

<?php
$foo 
True// assign the value TRUE to $foo
?>

Typically, the result of an operator which returns a boolean value is passed on to a control structure.

<?php
// == is an operator which tests
// equality and returns a boolean
if ($action == "show_version") {
    echo 
"The version is 1.23";
}

// this is not necessary...
if ($show_separators == TRUE) {
    echo 
"<hr>\n";
}

// ...because this can be used with exactly the same meaning:
if ($show_separators) {
    echo 
"<hr>\n";
}
?>

Converting to boolean

To explicitly convert a value to boolean, use the (bool) or (boolean) casts. However, in most cases the cast is unnecessary, since a value will be automatically converted if an operator, function or control structure requires a boolean argument.

See also Type Juggling.

When converting to boolean, the following values are considered FALSE:

?> ;
} /span>/span>/span>/span>/span>/span>sp;can be used with exache c(lesh)de> ?> /span>/span>/span>/span>/span>sp;can be used with exache c(lesh)de> ?> ;
}
/span>/span>sp;can be used with exache c(lesh)de> ?> ;
} /span>/span>sp;can be used with exache c(lesh)de> ?> tyle="color: #007700">) {
&12; echo ?> t)"lt;hr>\n"sp;can be used with exache c(fugge)de> ?> ;
}
sp;can be used with exache c(lesh)de> Typically, the result of an
ass=d="language.types.boole