웹기초/생활코딩 WEB 2 - PHP
[웹기초] 생활코딩 PHP 9 ~ PHP 17
renne
2022. 7. 11. 21:40
var_dump();
- 입력값과 데이터타입을 같이 출력하는 함수
<?php
print('<h2>1 == 1</h2>');
var_dump(1 == 1);
print('<h2>1 > 2</h2>');
var_dump(1 > 2);
?>
isset();
- 변수가 설정되었는지 확인하는 함수
<?php
$a = '';
$b = 'test';
var_dump(isset($a)); //TRUE
var_dump(isset($b)); //TRUE
unset($a);
$c = NULL;
var_dump(isset($a)); //FALSE
var_dump(isset($c)); //FALSE
?>
조건문 if
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<h1><a href="index.php">WEB</a></h1>
<ol>
<li><a href="index.php?id=HTML">HTML</a></li>
<li><a href="index.php?id=CSS">CSS</a></li>
<li><a href="index.php?id=JAVASCRIPT">JAVASCRIPT</a></li>
<li><a href="index.php?id=PHP">PHP</a></li>
</ol>
<h2>
<?php
if(isset($_GET['id'])){
echo $_GET['id'];
}
else {
echo "Welcome";
}
?>
</h2>
<?php
if(isset($_GET['id'])){
echo file_get_contents("data/".$_GET['id']);
}
else {
echo "Welcome to WEB";
}
?>
</body>
</html>
반복문 while
<?php
echo '1 ';
$i = 0;
while ($i < 3){
echo '2 ';
$i += 1;
}
echo '3 ';
?>
배열 array
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<?php
$black = array('Bellatrix', 'Narcissa', 'Regulus'); //배열 생성
echo $black[0].'<br>'; //배열의 원소 출력
var_dump(count($black)); //배열의 원소의 개수 출력
print('<br>');
array_push($black, 'Sirius'); //배열에 원소 추가
var_dump($black);
?>
</body>
</html>
scandir();
- List files and directories inside the specified path
<?php
$list = scandir('./data');
var_dump($list);
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<h1><a href="index.php">WEB</a></h1>
<ol>
<?php
$list = scandir('./data');
$i = 0;
while ($i < count($list)){
if ($list[$i] != '.'){
if ($list[$i] != '..'){
echo "<li><a href=\"index.php?id=$list[$i]\">$list[$i]</a></li>";
}
}
$i += 1;
}
?>
</ol>
<h2>
<?php
if(isset($_GET['id'])){
echo $_GET['id'];
}
else {
echo "Welcome";
}
?>
</h2>
<?php
if(isset($_GET['id'])){
echo file_get_contents("data/".$_GET['id']);
}
else {
echo "Welcome to WEB";
}
?>
</body>
</html>
