php 计数器实例(基于文件、基...-php应用开发之文件下载详解-php 查看页面源代码的实现代码(图文)

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▪php 计数器实例(基于文件、基于cookie方式) 1，基于文件实现的php计数器  <?php $cfile = "myData.dat"; $fh = fopen($cfile, "r+"); if (!$fh){ die("<BR>Failed to open file <I>$cfile</I>."); } .........

▪php应用开发之文件下载详解 1，php下载函数借助header()函数与readfile()函数实现文件下载功能。 <?php function DownloadFile($filename) { // Check filename if (empty($filename) || !file_exists($filename)) { return FALSE; .........

▪php 查看页面源代码的实现代码(图文) 本节分享的这段php代码，可用于显示与查看网页的源代码。代码： <?php /** * 显示与查看网页源代码 * edit：www. */ // Page title $pagetitle = 'Baumeister Mediasoft Engineering :: Resources :: ' .'.........

[1]php 计数器实例(基于文件、基于cookie方式)

来源: 互联网发布时间: 2013-12-24

1，基于文件实现的php计数器

<!-- 首先创建一个空文件：myData.dat-->       
<?php
$cfile = "myData.dat";
$fh = fopen($cfile, "r+");

if (!$fh){
    die("<BR>Failed to open file <I>$cfile</I>.");
}
$s = fgets($fh, 6);

$count = (int) $s;
$count = $count + 1;
$count = str_pad($count, 6);

rewind($fh);
fwrite($fh, $count);

echo "$count";

fclose($fh);
?>

2，基于cookie的php计数器

<?php
if (!isset($_COOKIE['visits'])) $_COOKIE['visits'] = 0;
$visits = $_COOKIE['visits'] + 1;
setcookie('visits',$visits,time()+3600*24*365);
?>
<html>
<head>
<title>基于cookie实现的php计数器-www.</title>
</head>
<body>
<?php
if ($visits > 1) {
  echo("This is visit number $visits.");
} else { // First visit
  echo('欢迎来到，开启你的技术之旅吧！');
}
?>
</body>
</html>

[2]php应用开发之文件下载详解

来源: 互联网发布时间: 2013-12-24

1，php下载函数
借助header()函数与readfile()函数实现文件下载功能。

<?php 
function DownloadFile($filename) 
{ 
    // Check filename 
    if (empty($filename) || !file_exists($filename)) 
    { 
        return FALSE; 
    } 
    // Create download file name to be displayed to user 
    $saveasname = basename($filename); 
    // Send binary filetype HTTP header 
    header('Content-Type: application/octet-stream'); 
    // Send content-length HTTP header 
    header('Content-Length: '.filesize($filename)); 
    // Send content-disposition with save file name HTTP header 
    header('Content-Disposition: attachment; filename="'.$saveasname.'"'); 
    // Output file 
    readfile($filename); 
    // Done 
    return TRUE; 
} 
?>

2，php文件下载脚本
更完善的php下载的自定义函数。

<?php 
////////////////////////////////////////////////////////////////////// 
// DOWNLOAD.PHP -- Download Utility 

// Get download file id (assume it's passed as a form or URL parameter) 
$id = getGlobalVar('id', 1); 

// Check download file id parameter, get download file name, download file 
// (assuming (global) variable $id specifies download file id) 
if (empty($id) || !DownloadFile(getDownloadFileName($id))) 
{ 
    die("No Download!"); 
} 

// Only functions beyond this point 

function getDownloadFilename($fileid) 
// Get download file pathname 
// Returns: download file pathname 
// Parameters: 
//    $fileid : File identifier 
{ 
    // Download file list 
    $DLFILES = array( 
        'TOOL1' => 'download/tool1_v30.exe', 
        'PROG2' => 'download/prog2setup.exe', 
        ); 
    // Get/check download file name 
    if (empty($fileid) || empty($DLFILES[$fileid])) 
    { 
        return ''; 
    } 
    // Set base directory to document root directory 
    // (could also be set to a directory outside document root!) 
    $basedir = getGlobalVar('DOCUMENT_ROOT'); 
    // Build and return download file name 
    return $basedir.'/'.$DLFILES[$fileid]; 
} 

function DownloadFile($filename) 
// Download file 
// Returns: TRUE if download successfully started, FALSE if download failed 
// Parameters: 
//    $filename : Download file pathname 
{ 
    // Verify filename 
    if (empty($filename) || !file_exists($filename)) 
    { 
        return FALSE; 
    } 
    // Create download file name to be displayed to user 
    $saveasname = basename($filename); 
    // Send binary filetype HTTP header 
    header('Content-Type: application/octet-stream'); 
    // Send content-length HTTP header 
    header('Content-Length: '.filesize($filename)); 
    // Send content-disposition with save file name HTTP header 
    header('Content-Disposition: attachment; filename="'.$saveasname.'"'); 
    // Output file 
    readfile($filename); 
    // Download successfully started 
    return TRUE; 
} 

function getGlobalVar($g, $formflag = 0) 
// Get global PHP variable value 
// Returns: global variable value or empty string if not available 
// Parameters: 
//  $g        : Global PHP variable name 
//  $formflag : Flag - global var from GET/POST input 
{ 
    if (empty($g)) 
    { 
        return 0; 
    } 
    // Try superglobal access (PHP 4.1.0+) 
    if ($formflag) 
    { 
        if (isset($_POST[$g])) 
        { 
            return $_POST[$g]; 
        } 
        if (isset($_GET[$g])) 
        { 
            return $_GET[$g]; 
        } 
        if (isset($_REQUEST[$g])) 
        { 
            return $_REQUEST[$g]; 
        } 
    } 
    else 
    { 
        if (isset($_SERVER[$g])) 
        { 
            return $_SERVER[$g]; 
        } 
        if (isset($_ENV[$g])) 
        { 
            return $_ENV[$g]; 
        } 
    } 
    // Try superglobal access (PHP 3.0.0+) 
    if (isset($GLOBALS[$g])) 
    { 
        return $GLOBALS[$g]; 
    } 
    // Try global variable access (PHP 3+) 
    global $$g; 
    if (!empty($$g)) 
    { 
        return $$g; 
    } 
    // Assume global variable empty/not set 
    return ''; 
} 
?>

将以上脚本保存为dl.php，在应用时传入id参数即可。

例如：
<a href="http://www.YourDomain.com/dl.php?id=PROG2">Download Program 2</a>
也可以通过php的重定向语句Location来实现，例如：

<?php
header("Location: http://www.YourDomain.com/dl.php?id=PROG2");
exit;
?>

以上的代码，可以防止用户直接访问下载文件，起到了一定的文件保护，甚至是防盗链的功能。

以下的代码，可以依据http头信息，作些介绍，从而提供更安全的文件下载。

代码：

<?php 
function DownloadFile($filename) 
{ 
    // Check filename 
    if (empty($filename) || !file_exists($filename)) 
    { 
        return FALSE; 
    } 
    // Create download file name to be displayed to user 
    $saveasname = basename($filename); 
    // Send binary filetype HTTP header 
    header('Content-Type: application/octet-stream'); 
    // Send content-length HTTP header 
    header('Content-Length: '.filesize($filename)); 
    // Send content-disposition with save file name HTTP header 
    // (using workaround for MSIE 5.5 SP1 / MSIE 6.01 bugs/problems) 
    $browser = getGlobalVar('HTTP_USER_AGENT'); 
    if (strstr('MSIE 5.5', $browser) 
     || strstr('MSIE 6.01', $browser)) 
    { 
        header('Content-Disposition: filename="'.$saveasname.'"'); 
    } 
    else 
    { 
        header('Content-Disposition: attachment; filename="'.$saveasname.'"'); 
    } 
    // Send Content-Transfer-Encoding HTTP header 
    // (use binary to prevent files from being encoded/messed up during transfer) 
    header('Content-Transfer-Encoding: binary'); 
    // Output file 
    readfile($filename); 
    // Done 
    return TRUE; 
} 

function getGlobalVar($g, $formflag = 0) 
// Get global PHP variable value 
// Returns: global variable value or empty string if not available 
// Parameters: 
//  $g        : Global PHP variable name 
//  $formflag : Flag - global var from GET/POST input 
{ 
    if (empty($g)) 
    { 
        return 0; 
    } 
    // Try superglobal access (PHP 4.1.0+) 
    if ($formflag) 
    { 
        if (isset($_GET[$g])) 
        { 
            return $_GET[$g]; 
        } 
        if (isset($_POST[$g])) 
        { 
            return $_POST[$g]; 
        } 
        if (isset($_REQUEST[$g])) 
        { 
            return $_REQUEST[$g]; 
        } 
    } 
    else 
    { 
        if (isset($_SERVER[$g])) 
        { 
            return $_SERVER[$g]; 
        } 
        if (isset($_ENV[$g])) 
        { 
            return $_ENV[$g]; 
        } 
    } 
    // Try superglobal access (PHP 3.0.0+) 
    if (isset($GLOBALS[$g])) 
    { 
        return $GLOBALS[$g]; 
    } 
    // Try global variable access (PHP 3+) 
    global $$g; 
    if (!empty($$g)) 
    { 
        return $$g; 
    } 
    // Assume global variable empty/not set 
    return ''; 
} 
?> 
<?php 
function DownloadFile($filename) 
{ 
    // Check filename 
    if (empty($filename) || !file_exists($filename)) 
    { 
        return FALSE; 
    } 
    // Create download file name to be displayed to user 
    $saveasname = basename($filename); 
    // Send binary filetype HTTP header 
    header('Content-Type: application/octet-stream'); 
    // Send content-length HTTP header 
    header('Content-Length: '.filesize($filename)); 
    // Send content-disposition with save file name HTTP header 
    // (using workaround for MSIE 5.5 SP1 / MSIE 6.01 bugs/problems) 
    $browser = getGlobalVar('HTTP_USER_AGENT'); 
    if (strstr('MSIE 5.5', $browser) 
     || strstr('MSIE 6.01', $browser)) 
    { 
        header('Content-Disposition: filename="'.$saveasname.'"'); 
    } 
    else 
    { 
        header('Content-Disposition: attachment; filename="'.$saveasname.'"'); 
    } 
    // Send Content-Transfer-Encoding HTTP header 
    // (use binary to prevent files from being encoded/messed up during transfer) 
    header('Content-Transfer-Encoding: binary'); 
    // Output file 
    readfile($filename); 
    // Done 
    return TRUE; 
} 

function getGlobalVar($g, $formflag = 0) 
// Get global PHP variable value 
// Returns: global variable value or empty string if not available 
// Parameters: 
//  $g        : Global PHP variable name 
//  $formflag : Flag - global var from GET/POST input 
{ 
    if (empty($g)) 
    { 
        return 0; 
    } 
    // Try superglobal access (PHP 4.1.0+) 
    if ($formflag) 
    { 
        if (isset($_GET[$g])) 
        { 
            return $_GET[$g]; 
        } 
        if (isset($_POST[$g])) 
        { 
            return $_POST[$g]; 
        } 
        if (isset($_REQUEST[$g])) 
        { 
            return $_REQUEST[$g]; 
        } 
    } 
    else 
    { 
        if (isset($_SERVER[$g])) 
        { 
            return $_SERVER[$g]; 
        } 
        if (isset($_ENV[$g])) 
        { 
            return $_ENV[$g]; 
        } 
    } 
    // Try superglobal access (PHP 3.0.0+) 
    if (isset($GLOBALS[$g])) 
    { 
        return $GLOBALS[$g]; 
    } 
    // Try global variable access (PHP 3+) 
    global $$g; 
    if (!empty($$g)) 
    { 
        return $$g; 
    } 
    // Assume global variable empty/not set 
    return ''; 
} 
?>

[3]php 查看页面源代码的实现代码(图文)

来源: 互联网发布时间: 2013-12-24

本节分享的这段php代码，可用于显示与查看网页的源代码。

代码：

<?php 
/**
* 显示与查看网页源代码  
* edit：www.
*/
// Page title 
$pagetitle  = 'Baumeister Mediasoft Engineering :: Resources :: ' 
    .'PHP Application: Display/View Web Page Contents/Source' 
    ; 
// Messages 
$fmturl     = '<p >"%s" contents/source:</p>'."\n"; 
$nosource   = '<span >* empty / not found *</span>'; 
// Form parameters 
$url        = isset($_REQUEST['url']) ? $_REQUEST['url'] : ''; 
$dowrap     = isset($_REQUEST['wrapsource']) && !empty($_REQUEST['wrapsource']) && ($_REQUEST['wrapsource'] == 'on') ? 1 : 0; 
?> 
<html> 
<head> 
<title><?php echo $pagetitle;?></title> 
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> 
</head> 
<body > 
<h3 ><?php echo $pagetitle;?></h3> 
<hr /> 
<form method="post" > 
URL <input  type="text" size="50" 
 name="url" value="<?php echo empty($url) ? 'http://' : $url;?>" /> 
<input  type="checkbox" 
 name="wrapsource"<?php if ($dowrap) { echo ' checked="checked"';}?> />Wrap 
<input  type="submit" value="Go" /> 
</form> 
<?php 
if (!empty($url)) 
{ 
    // Start web page output 
    echo '<hr />'."\n"; 
    // Display selected URL 
    echo sprintf($fmturl, $url); 
    // Enable URL-aware fopen wrappers to allow for URL file reading 
    if ((double)phpversion() >= 4.2) 
    { 
        ini_set('allow_url_fopen', '1'); 
    } 
    // Read file 
    $s = @file_get_contents($url); 
    if (empty($s)) 
    { 
        // Web page empty/access failure 
        echo $nosource; 
    } 
    else 
    { 
        // Display web page contents/source using form/textarea 
?> 
<form name="_webpagesource_" > 
<script type="text/javascript" language="JavaScript"> 
<!-- 
// Display select all button 
document.write('<input  type="button" value="Select All"' 
    + ' onclick="document.forms[\'_webpagesource_\'][\'_src_\'].select();"' 
    + ' />' 
    ); 
//--> 
</script> 
<table width="100%" height="80%" border="0" cellspacing="0" cellpadding="0"><tr> 
<td > 
<textarea id="_src_"  
 wrap="<?php echo $dowrap ? 'virtual' : 'off';?>"> 
<?php echo htmlspecialchars($s);?> 
</textarea> 
</td> 
</tr></table> 
</form> 
<?php 
    } 
} 
?> 
<hr /> 
<p > 
Copyright &#169; 2013-<?php echo date('Y');?> 
 by <a href="http://www." target="_top">，欢迎您。</a> 
</p> 
</body> 
</html>

调用示例：