Booleans
This is the easiest type. A boolean
expresses a truth value. It can be either TRUE or FALSE.
Note: The boolean type was introduced in PHP 4.
Syntax
To specify a boolean literal, use either the keyword TRUE
or FALSE. Both are case-insensitive.
<?php
$foo = True; // assign the value TRUE to $foo
?>
Usually you use some kind of operator which returns a boolean
value, and then pass it on to a control structure.
<?php
// == is an operator which test
// equality and returns a boolean
if ($action == "show_version") {
echo "The version is 1.23";
}
// this is not necessary...
if ($show_separators == TRUE) {
echo "<hr>\n";
}
// ...because you can simply type
if ($show_separators) {
echo "<hr>\n";
}
?>
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