php数组排序之多维数组与一维数组

<?php
$a =array(100,80,50,10,0);
$b = array("c","f","q","e","z");
array_multisort($a,$b);
var_dump($a);
var_dump($b);
?>
运行结果：
array(5) { [0]=> int(0) [1]=> int(10) [2]=> int(50) [3]=> int(80) [4]=> int(100) }
array(5) { [0]=> string(1) “z” [1]=> string(1) “e” [2]=> string(1) “q” [3]=> string(1) “f” [4]=> string(1) “c” }

$a = array(1 => 'a', 'b', 'c');
$b = array(1 => 'aa', 2, 'c');
$union = array_merge($a, $b);
$plus = $a + $b;
print_r($union);
print_r($plus);
结果依次为：
Array
{
[0]=> a
[1]=> b
[2]=> c
[3]=> aa
[4]=> 2
[5]=> c
}
Array
(
[1] => a
[2] => b
[3] => c
)

$a2 = array('str' => 'a', 'b', 'c');
$b2 = array('str' => 'aa', 2, 'c');
$union2 = array_merge($a2, $b2);
$plus2 = $a2 + $b2;
print_r($union2);
print_r($plus2);

结果依次为：

Array
(
[str] => aa
[0] => b
[1] => c
[2] => 2
[3] => c
)
Array
(
[str] => a
[0] => b
[1] => c
)

$intersection2 = array_intersect(array_map('strtolower',$a), array_map('strtolower',$b));
print_r($intersection);
print_r($intersection2);

$old = array('jpg','png','gif','bmp');
$new = array('JPG','txt','docx','bmp');
$difference = array_diff($old, $new);

$difference = array_diff(array_map('strtolower',$old), array_map('strtolower',$new));

<?php

/**
 * Validator for Login.
 */
final class LoginValidator {

    private function __construct() {
       
    }

    /**
     * Validate the given username and password.
     * @param $username and $password to be validated
     * @return array array of {@link Error} s
     */
    public static function validate($username, $password) {
        $errors = array();
        $username = trim($username);
        if (!$username) {
            $errors[] = new Error('username', '用户名不能为空。');
        } elseif (strlen($username)<3) {
            $errors[] = new Error('username', '用户名长度不能小于3个字符。');
        } elseif (strlen($username)>30) {
            $errors[] = new Error('username', '用户名长度不能超过30个字符。');
        } elseif (!preg_match('/^[A-Za-z]+$/',substr($username, 0, 1))) {
            $errors[] = new Error('username', '用户名必须以字母开头。');
        } elseif (!preg_match('/^[A-Za-z0-9_]+$/', $username)) {
            $errors[] = new Error('username', '用户名只能是字母、数字以及下划线( _ )的组合。');
        } elseif (!trim($password)) {
            $errors[] = new Error('password', '密码不能为空。');
        } else {
            // check whether use exists or not
            $dao = new UserDao();
            $user = $dao->findByName($username);

            if ($user) {
                if (!($user->getPassword() == sha1($user->getSalt() . $password))) {
                    $errors[] = new Error('password', '用户名或密码错误。');
                }
            } else {
                $errors[] = new Error('username', '用户名不存在。');
            }
        }
        return $errors;
    }
}

?>

$username = null;
$password = null;

$msg = "";

if (isset($_POST['username']) && isset($_POST['password'])) {
    $username = addslashes(trim(stripslashes($_POST ['username'])));
    $password = addslashes(trim(stripslashes($_POST ['password'])));
    // validate
    $errors = LoginValidator::validate($username, $password);
   
    if (empty($errors)) {
        // save the latest ip or login time into database, then processing page forwarding
        $dao = new UserDao();
        $user = $dao->findByName($username);
        $last_login_ip = Utils::getIpAddress();
        $user->setLastLoginIp($last_login_ip);
        $now = new DateTime();
        $user->setLastLoginTime($now);
        $dao->save($user);
        UserLogin::setUserInfo($user);
        Flash::addFlash('登录成功！');
        Utils::redirect('welcome');
    }
   
    foreach ($errors as $e) {
        $msg .= $e->getMessage()."<br>";
    }

<script type="text/javascript">
 
$(document).ready(function() {
 
    $("#login").click(function() {
 
        var action = $("#form1").attr('action');
 
        var form_data = {
 
            username: $("#username").val(),
 
            password: $("#password").val(),
 
            is_ajax: 1
 
        };
 
        $.ajax({
 
            type: "POST",
 
            url: action,
 
            data: form_data,
 
            success: function(response)
 
            {
 
                if(response == 'success')
 
                    $("#form1").slideUp('slow', function() {
 
                        $("#message").html("<p class='success'>登陆成功!</p>");
 
                    });
 
                else
 
                    $("#message").html("<p class='error'>用户名或密码错误.</p>");   
 
            }
 
        });
 
        return false;
 
    });
 
});
 
</script>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>PHP Login with jQuery AJAX</title>
<style>
body, input {
 font-family: Georgia, "Times New Roman", Times, serif;
}
#content {
 background-color: #eee;
 width: 300px;
 margin: 0 auto;
 border: 1px solid #aaa;
 -moz-border-radius: 10px;
 -moz-box-shadow: 0 0 10px #aaa;
 -webkit-border-radius: 10px;
 -webkit-box-shadow: 0 0 10px #aaa;
 padding: 10px;
}
#form1 label {
 display: block;
 font-size: 16px;
 line-height: 25px;
}
#form1 input[type=text], #form1 input[type=password] {
 padding: 2px;
 font-size: 16px;
 line-height: 20px;
 width: 250px;
}
#form1 input[type=submit] {
 font-size: 20px;
 font-weight: bold;
 padding: 5px;
}
.success {
 color: #060;
}
.error {
 color: red;
}

</style>

<script type="text/javascript" src="jquery-1.5.2.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
 
 $("#login").click(function() {
 
  var action = $("#form1").attr('action');
  var form_data = {
   username: $("#username").val(),
   password: $("#password").val(),
   is_ajax: 1
  };
  
  $.ajax({
   type: "POST",
   url: action,
   data: form_data,
   success: function(response)
   {
    if(response == 'success')
     $("#form1").slideUp('slow', function() {
      $("#message").html("<p class='success'>You have logged in successfully!</p>");
     });
    else
     $("#message").html("<p class='error'>Invalid username and/or password.</p>"); 
   }
  });
  
  return false;
 });
 
});
</script>
</head>

<body>
<p>&nbsp;</p>
<div id="content">
  <h1>Login Form</h1>
  <form id="form1" name="form1" action="doLogin.php" method="post">
    <p>
      <label for="username">Username: </label>
      <input type="text" name="username" id="username" />
    </p>
    <p>
      <label for="password">Password: </label>
      <input type="password" name="password" id="password" />
    </p>
    <p>
      <input type="submit" id="login" name="login" />
    </p>
  </form>
    <div id="message"></div>
</div>
</body>
</html>

<?php
 
 $is_ajax = $_REQUEST['is_ajax'];
 if(isset($is_ajax) && $is_ajax)
 {
  $username = $_REQUEST['username'];
  $password = $_REQUEST['password'];
  
  if($username == 'demo' && $password == 'demo')
  {
   echo "success"; 
  }
 }
 
?>

$myFile = "testFile.txt";
$fh = fopen($myFile, 'w') or die("can't open file");
fclose($fh);
判断是否删除了.

$myFile = "testFile.txt";
unlink($myFile);

$filename = 'file.txt';
fopen($filename,'a+');
if(!unlink($filename))
{
echo "文件{$filename}删除失败";
}
else
{
echo "文件{$filename}删除成功";
}
?>

function delFileUnderDir( $dirName="../Smarty/templates/templates_c" )
{
if ( $handle = opendir( "$dirName" ) ) {
   while ( false !== ( $item = readdir( $handle ) ) ) {
   if ( $item != "." && $item != ".." ) {
   if ( is_dir( "$dirName/$item" ) ) {
         delFileUnderDir( "$dirName/$item" );
   } else {
   if( unlink( "$dirName/$item" ) )echo "成功删除文件： $dirName/$item<br />n";
   }
   }
   }
   closedir( $handle );
}
}