Examples:
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"; } ?>
<?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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