极客教程PHP 比较运算符实例
尝试以下示例以了解所有比较运算符。将以下PHP程序复制并粘贴到test.php文件中，将其保存在您的PHP服务器的文档根目录中，并使用任何浏览器进行浏览。
<html>
<head>
<title>Comparison Operators</title>
</head>
<body>
<?php
a = 42;b = 20;
if( a ==b ) {
echo "TEST1 : a is equal to b<br/>";
}else {
echo "TEST1 : a is not equal to b<br/>";
}
if( a>b ) {
echo "TEST2 : a is greater than b<br/>";
}else {
echo "TEST2 : a is not greater than b<br/>";
}
if( a<b ) {
echo "TEST3 : a is less than b<br/>";
}else {
echo "TEST3 : a is not less than b<br/>";
}
if( a !=b ) {
echo "TEST4 : a is not equal to b<br/>";
}else {
echo "TEST4 : a is equal to b<br/>";
}
if( a >=b ) {
echo "TEST5 : a is either greater than or equal to b<br/>";
}else {
echo "TEST5 : a is neither greater than nor equal to b<br/>";
}
if( a <=b ) {
echo "TEST6 : a is either less than or equal to b<br/>";
}else {
echo "TEST6 : a is neither less than nor equal to b<br/>";
}
?>
</body>
</html>
这将产生以下结果−
TEST1 : a is not equal to b
TEST2 : a is greater than b
TEST3 : a is not less than b
TEST4 : a is not equal to b
TEST5 : a is either greater than or equal to b
TEST6 : a is neither less than nor equal to b