试试下面的例子就明白了比较运算符的用法。复制并粘贴下面内容到test.php文件,并将PHP程序保存在PHP服务器的文档根目录,并使用浏览器浏览。
<html>
<head><title>比较运算符</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 grater than or equal to b<br/>";
}else{
echo "TEST5 : a is nieghter 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 nieghter 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 grater than or equal to b TEST6 : a is nieghter less than nor equal to b