极客教程PHP 逻辑运算符示例
尝试以下示例以了解所有的逻辑运算符。将以下PHP程序复制并粘贴到test.php文件中，并将其保存在您的PHP服务器的文档根目录中，然后使用任何浏览器浏览它。
<html>
<head>
<title>Logical Operators</title>
</head>
<body>
<?php
a = 42;b = 0;
if( a &&b ) {
echo "TEST1 : Both a and b are true<br/>";
}else{
echo "TEST1 : Either a or b is false<br/>";
}
if( a andb ) {
echo "TEST2 : Both a and b are true<br/>";
}else{
echo "TEST2 : Either a or b is false<br/>";
}
if( a ||b ) {
echo "TEST3 : Either a or b is true<br/>";
}else{
echo "TEST3 : Both a and b are false<br/>";
}
if( a orb ) {
echo "TEST4 : Either a or b is true<br/>";
}else {
echo "TEST4 : Both a and b are false<br/>";
}
a = 10;b = 20;
if( a ) {
echo "TEST5 : a is true <br/>";
}else {
echo "TEST5 : a is false<br/>";
}
if(b ) {
echo "TEST6 : b is true <br/>";
}else {
echo "TEST6 : b is false<br/>";
}
if( !a ) {
echo "TEST7 : a is true <br/>";
}else {
echo "TEST7 : a is false<br/>";
}
if( !b ) {
echo "TEST8 : b is true <br/>";
}else {
echo "TEST8 : b is false<br/>";
}
?>
</body>
</html>
这将产生以下结果 −
TEST1 : Either a or b is false
TEST2 : Either a or b is false
TEST3 : Either a or b is true
TEST4 : Either a or b is true
TEST5 : a is true
TEST6 : b is true
TEST7 : a is false
TEST8 : b is false