'AND' Logical operator
'AND' operator is a logical AND operator but has low precedence to = operator.
'&&' Logical operator
'&&' is also a logical AND operator but has high precedence to = operator.
Example
Following the example, shows the difference of 'AND' vs '&&' operators.
<!DOCTYPE html>
<html>
<head>
<title>PHP Example</title>
</head>
<body>
<?php
$x = true;
$y = false;
$result = $x AND $y;
print('$result = $x AND $y');
print("<br/>");
var_dump($result);
print("<br/>");
$result = $x && $y;
print('$result = $x && $y');
print("<br/>");
var_dump($result);
?>
</body>
</html>Output
$result = $x AND $y bool(true) $result = $x && $y bool(false)