1. PHP의 원리
-
[A] Web browser
-
[B] Web server (Apache) & PHP
이 둘은 어떻게 상호작용하는가?
[A]——index.html—–> [B] Web server
[A]——index.php—–> [B] Web server ——index.php—–> [B] PHP
2. PHP의 Data Type
숫자 & 문자 & (문자 길이)
<!doctype html>
<html>
<body>
<?php
echo 1+1;
echo 2/2;
?>
<?php
echo "Hello World";
echo "Hello "."World";
echo "Hello \"W\"orld";
?>
<?php
echo strlen("Hello World");
?>
</body>
</html>
3. 변수 ( Variable )
<!doctype html>
<html>
<body>
<?php
$name = "LEE";
echo "abcdefg ".$name." dfjdsfadj ".$name." dfdaf ".$name." fdas";
?>
</body>
</html>
4. URL 파라미터
parameter.php
<!doctype html>
<html>
<head>
<meta charset='utf-8'>
</head>
<body>
안녕하세요. <?php echo $_GET['address']; ?>에 사는 <?php echo $_GET['name']; ?>님
</body>
</html>
- 127.0.0.1/parameter.php?name=lee&address=서울
- 127.0.0.1/parameter.php?name=park&address=부산
- 127.0.0.1/parameter.php?name=kim&address=대전
<!doctype html>
<html>
<head>
<meta charset='utf-8'>
</head>
<body>
<h1>WEB</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>
</ol>
<h2>
<?php echo $_GET['id']; ?>
</h2>
abcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdev
</body>
</html>
5. 함수
php new line to <br>
- string nl2br
<!doctype html>
<html>
<head>
<meta charset='utf-8'>
</head>
<body>
<h1>WEB</h1>
<?php
$str = "abcd efadsjfkll
akldsjfladsj";
echo $str;
?>
<h2>strlen()</h2>
<?php
echo strlen($str);
?>
<h2>nl2br</h2>
<?php
echo nl2br($str);
?>
</body>
</html>
본문 내용이 바뀌게끔!
<!doctype html>
<html>
<head>
<meta charset='utf-8'>
</head>
<body>
<h1>WEB</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>
</ol>
<h2>
<?php echo $_GET['id']; ?>
</h2>
<?php
echo file_get_contents('data/.$GET_['id']');
?>
</body>
</html>
6. var_dump
- print(1)의 output : 1
-
var_dump(1) 의 output : int(1)
- var_dump(“11”) 의 output : string(2) “11”
7. 조건문
- isset : 값이 존재한다면 TRUE 아니면 FALSE
<!doctype html>
<html>
<head>
<meta charset='utf-8'>
</head>
<body>
<h1>WEB</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>
</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 "Hello, PHP";
}
?>
</body>
</html>
<!doctype html>
<html>
<head>
<meta charset='utf-8'>
<title>Loop</title>
</head>
<body>
<h1>while</h1>
<?php
echo '1<br>';
$i=0;
while($i<3){
echo '2<br>';
$i = $i+1;
}
echo '3<br>'
?>
</body>
</html>
8. Array
<!doctype html>
<html>
<head>
<meta charset='utf-8'>
<title>Array</title>
</head>
<body>
<h1>Arrays</h1>
<?php
$coworkers = array('a','b','c','d');
var_dump(count($coworkers));
echo $workers[3].'<br>';
echo $workers[1].'<br>';
echo $workers[0].'<br>';
echo $workers[2].'<br>';
?>
<?php
$colors = array('red','green');
array_push($colors,'blue','yellow');
print_r($colors);
?>
</body>
</html>
scandir = directory that will be scanned
<!doctype html>
<html>
<head>
<meta charset='utf-8'>
</head>
<body>
<h1>WEB</h1>
<ol>
<?php
$list = scandir('./data');
/* 주석 */
$i = 0;
while($i<count($list)){
if ($list[$i] !='.'){
if ($list[$i] !='.'){
echo "<li><a
href=\"index.php?id=$list[$i]\">$list[i]</li>\n";
}
}
$i = $i+1;
}
?>
</ol>
<h2>
<?php
if(isset($_GET['id'])){
echo $_GET['id'];
} else{
echo "Welcome";
}
?>
</h2>
<?php
if(isset($_GET['id'])){
echo file_get_contents('data/.$GET_['id']');
} else {
echo "Hello, PHP";
}
?>
</body>
</html>
9. 함수
function2.php
<!doctype html>
<html>
<head>
<meta charset='utf-8'>
<title>function</title>
</head>
<body>
<h1>Function</h1>
<h2>Basic</h2>
<?php
function basic(){
print("abcdfdsjfasdfadsf");
print("dfajdklsjfdkjflsf");
}
basic();
?>
<h2> parameter & argument </h2>
<?php
function sum($left, $right){
print($left,$right);
print("<br>");
}
sum(2,4);
sum(4,8);
?>
<h2> return </h2>
<?php
function sum2($left, $right){
return $left+$right;
}
print(sum2(2,4));
file_put_contents('result.txt',sum2(2,4));
//email('egoing@egoing.net', sum2(2,4));
//upload('egoing.net', sum2(2,4));
?>
</body>
</html>
<?php
function print_title(){
if(isset($_GET['id'])){
echo $_GET['id'];
} else{
echo "Welcome";
}
}
function print_description(){
if(isset($_GET['id'])){
echo file_get_contents('data/.$GET_['id']');
} else {
echo "Hello, PHP";
}
}
function print_list(){
$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]</li>\n";
}
}
$i = $i+1;
}
}
?>
<!doctype html>
<html>
<head>
<meta charset='utf-8'>
<title>
<?php
print_title();
?>
</title>
</head>
<body>
<h1><a href='index.php'>WEB</a></h1>
<ol>
<?php
print_list();
?>
</ol>
<h2>
<?php
print_title();
?>
</h2>
<?php
print_description();
?>
</body>
</html>
10. form과 POST
- 전송 방식 : (default) GET vs POST
form.html
<!doctype html>
<html>
<body>
<form action='form.php' method='post'>
<p> <input type='text' name='title' placeholder='Title'> </p>
<p> <textarea name='description'> 여러 내용 입력 가능! </textarea> </p>
<p> <input type='submit'> </p>
</form>
</body>
</html>
form.php
<?php
file_put_contents('data/'.$_POST['title'], $_POST['description']);
?>
11. 글 생성 (C)
<!doctype html>
<html>
<head>
<meta charset='utf-8'>
<title>
<?php
print_title();
?>
</title>
</head>
<body>
<h1><a href='index.php'>WEB</a></h1>
<ol>
<?php
print_list();
?>
</ol>
<a href='create.php'>create</a>
<form action='create_process.php' method='post'>
<p><input type='text' name='title' placeholder='Title'></p>
<p><textarea name='description' placeholder='Description'></textarea></p>
<p><input type='submit'></p>
</form>
<h2>
<?php
print_title();
?>
</h2>
<?php
print_description();
?>
</body>
</html>
create_process.php
<?php
file_put_contents('data/.'$_POST['title'], $_POST['description']);
header('Location : /index.php?id='.$_POST['title']);
?>
12. 글 수정 (U)
<!doctype html>
<html>
<head>
<meta charset='utf-8'>
<title>
<?php
print_title();
?>
</title>
</head>
<body>
<h1><a href='index.php'>WEB</a></h1>
<ol>
<?php
print_list();
?>
</ol>
<a href='create.php'>create</a>
<?php if(isset($_GET['id'])) { ?>
<a href="update.php?id=<?php echo $_GET['id']; ?>">update</a>
<?php } ?>
<h2>
<form action='update_process.php' method='post'>
<input type ='hidden' name='old_title' value="<?=$_GET['id']?>">
<p> <input type='text' name='title' placeholder='Title' value="<?php print_title();?>"> </p>
<p> <textarea name='description' placeholder='Description'><?php print_description();?></textarea> </p>
<p> <input type='submit'> </p>
</form>
</body>
</html>
update_process.php
<?php
rename("data/".$_POST['old_title'],"data/".$_POST['title']);
file_put_contents('data/'.$_POST['title'], $_POST['description']);
header('Location : /index.php?id='.$_POST['title']);
?>
13. 글 삭제 (D)
<!doctype html>
<html>
<head>
<meta charset='utf-8'>
<title>
<?php
print_title();
?>
</title>
</head>
<body>
<h1><a href='index.php'>WEB</a></h1>
<ol>
<?php
print_list();
?>
</ol>
<a href='create.php'>create</a>
<?php if(isset($_GET['id'])) { ?>
<a href="update.php?id=<?php echo $_GET['id']; ?>">update</a>
<a href="delete_process.php?id=<?php echo $_GET['id']; ?>">delete</a>
<form action='delete_process.php' method='post'>
<input type='hidden' name='id' value='<?=$_GET['id']?>'>
<input type='submit' value='delete'>
</form>
<?php } ?>
<h2>
<?php
print_title();
?>
</h2>
<?php
print_description();
?>
</body>
</html>
delete_process.php
<?php
unlink('data/'.$_GET['id']);
header('Location: /index.php');
?>