This is a bold text.";
// 变量
$NAME = 'BREEZE';
$name = 'breeze'; // 变量名对大小写敏感
// 1ABC = 25; 变量名不能以数字起始
$variable = 'name';
echo $name;
echo $name.$NAME; // breezeBREEZE
echo $$variable; // breeze
// 常量
define("CASE_SENSITIVE_CONSTANT","CONSTANT_SAMPLE",true); // 定义一个具有大小写敏感的名称的常量
define("CASE_INSENSITIVE_CONSTANT","CONSTANT_SAMPLE",false); // 定义一个具有大小写不敏感的名称的常量
define("CONSTANT","CONSTANT_SAMPLE"); // 默认情况下，常量名称的大小写不敏感。然而，名称大小写敏感的常量依然以小写形式储存，因此在定义一个大小写敏感常量之后再定义一个同名小写常量将发生错误
echo CASE_SENSITIVE_CONSTANT;
$string1 = '9';
$int1 = -42;
$float1 = 42.09;
$boolean1 = true; // 另一个布尔值为 false
echo($string1+int1); // -33
// 方法
function getName() { // 方法名对大小写不敏感，且只能以字母或下划线（_）起始
$name = 'Breeze';
echo $name; // 将 echo 'Breeze' 而非之前定义的 'breeze'
return $name;
}
function getGlobalName() {
global $name;
echo $name; // 将 echo 之前定义的 'breeze'
} // 返回 NULL
function echoName($name='Alice') {
echo $name;
}
echoName('Alice'); // Alice
echoName(); // Alice
// 算术
$num1 =4;
$num2 =3;
echo $num1/$num2; // 1.33333333333
echo $num1%$num2; // 1
$num1++;
--$num2;
$num2 += $num1; // $num2 = 7
$t = true;
$f = false;
// 逻辑运算
$booleanResult = $t and $f or $t xor $f && $t || !$f
if ($num1 > 1 and $num1 < 1 or $num1 >= 0 xor $num2 <= 5 && $num1 != $num2 || !($num1 <> $num2)) {
} else if ($num1 == $num2) { // 相等
echo $num1++;
} else if ($num1 === $num2) { // 相等且类型相同 (全等)
echo $num1--;
} else if ($num1 !== $num2) { // 不等或类型不同 (不全等)
echo $num2++;
} else {
echo $num2--;
}
// 数组
$peopleNumeric = array("Alice","Bob");
$peopleAssociative = array("Alice"=>"17","Bob"=>"18");
$peopleMultiDimensional = array("Alice"=>array('C','Z'),"Bob"=>array('H','W','L'));
echo $peopleNumber[0]; // Alice
echo $peopleAssociative['Alice']; // 17
echo $peopleMultiDimensional['Bob'][2]; // L
// 循环
$intForWhile = 1;
while ($intForWhile<9) {
echo "Current: ".$intForWhile;
$intForWhile++;
}
do {
echo "Current: ".$intForWhile;
$intForWhile++;
} while($intForWhile<20)
for ($i = 0;$i <9;$i++) {
echo "Current: ".$i;
if ($i==7) {
continue;
}
}
foreach($peopleNumeric as $ $person) {
echo $person; // Alice Bob
}
// switch
switch ($peopleNumber[0]) {
case "Alice":
echo "Alice";
break;
case "bob":
case "Bob":
echo "Bob";
break;
default:
echo "No match";
}
// superglobals
echo $_SERVER['SCRIPT_NAME']; // including $GLOBALS, $_REQUEST, $_POST, $_GET, $_FILES, $_ENV, $_COOKIE, $_SESSION
echo $_SERVER['SCRIPT_FILENAME'];
echo $_SERVER['SCRIPT_URL'];
echo $_SERVER['HTTP_HOST'];
echo $_SERVER['PHP_SELF'];
echo $_SERVER['SERVER_ADDR'];
echo $_SERVER['SERVER_NAME'];
echo $_SERVER['SERVER_PORT'];
echo $_SERVER['REMOTE_ADDR'];
echo $_SERVER['REMOTE_HOST'];
echo $_SERVER['REMOTE_PORT'];
// 文件操作
$file=fopen("file.txt", "w"); // mode: r, w, a, x, r+, w+, a+, x+. a mode won't erase data
fwrite($file,"TEXT\n"); // the original content is erased
fclose($file); // return true or false
$file=fopen("file.txt", "a");
fwrite($file,"TEXT\n"); // content of the file: TEST\nTEST\n
fclose($file);
$content=file("file.txt");
$count=count($content); // get length of the array
foreach ($content as $line) {
echo $line."\n";
}
?>
post.php 以 POST 方式提交表单
main.php 接收 POST
Welcome
session_cookie_get.php 将数据存至 session 与 Cookie
tag
if (isset($_COOKIE['user'])) { // check if the value has been set
echo $_COOKIE['user']." is set in cookie";
}
?>
actionGet.php 接收 GET
Welcome