Examples:
To specify a boolean literal, use the constants TRUE
or FALSE
. Both are case-insensitive.
1 2 3 | <?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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | <?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" ; } ?> |
1 2 3 4 5 6 7 8 9 10 | <?php 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) ?> |
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