demo1.php
<?php
header('Content-Type: text/html; charset=utf-8');
//PHP encryption and decryption
function encryptDecrypt($key, $string, $decrypt){
if($decrypt){
$decrypted = rtrim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, md5($key), base64_decode($string), MCRYPT_MODE_CBC, md5(md5($key))), "12");
return $decrypted;
}else{
$encrypted = base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5($key), $string, MCRYPT_MODE_CBC, md5(md5($key))));
return $encrypted;
}
}
//encryption:
echo encryptDecrypt('demo', '网址：onestopweb.iteye.com',0),'<br>';
// decrypt:
echo encryptDecrypt('demo', 'lONfy9/i2RmCh31P/cKFfM6Jd90ijfg0rhJr1GihF+o=',1);
/* output effect:
* lONfy9/i2RmCh31P/cKFfM6Jd90ijfg0rhJr1GihF+o=
* URL: onestopweb.iteye.com
* */
demo2.php
<?php
//PHP generates random string
function generateRandomString($length = 10) {
$characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$randomString = '';
for ($i = 0; $i < $length; $i++) {
$randomString .= $characters[rand(0, strlen($characters) - 1)];
}
return $randomString;
}
echo generateRandomString(20);
/* output effect:
* 4e7ficXJk0jMvDQcCgZ8
* */
demo3.php
<?php
//PHP gets the file extension (suffix)
function getExtension($filename){
$myext = substr($filename, strrpos($filename, '.'));
return str_replace('.','',$myext);
}
$filename = 'xxx.dd.gif';
echo getExtension($filename);
/* output effect:
* gif
* */
demo4.php
<?php
//PHP get file size and format
function formatSize($size) {
$sizes = array(" Bytes", " KB", " MB", " GB", " TB", " PB", " EB", " ZB", " YB");
if ($size == 0) {
return('n/a');
} else {
return (round($size/pow(1024, ($i = floor(log($size, 1024)))), 2) . $sizes[$i]);
}
}
$thefile = filesize('demo.rar');
echo formatSize($thefile);
/* output effect:
* 114.14 KB
* */
demo5.php
<?php
header('Content-Type: text/html; charset=utf-8');
//PHP replace label characters
function stringParser($string,$replacer){
$result = str_replace(array_keys($replacer), array_values($replacer),$string);
return $result;
}
$string = 'Who asks you to read, the fragrance floats when the water falls. ';
$replace_array = array('Read' => 'Watch', 'Jun' => 'You', 'Float' => 'Sink');
echo stringParser($string,$replace_array);
/* output effect:
* See who asks you to chant, the water falls and the fragrance fades away.
* */
demo6.php
<?php
//PHP lists the file names in the directory
function listDirFiles($DirPath){
if($dir = opendir($DirPath)){
while(($file = readdir($dir))!== false){
if(!is_dir($DirPath.$file))
{
echo "filename: $file<br />";
}
}
}
}
listDirFiles('aaa');
/* output effect:
* filename: bbb
* filename: ccc
* */
demo7.php
<?php
//PHP gets the current page URL
//The following function can get the URL of the current page, whether it is http or https.
function curPageURL() {
$ pageURL = 'http';
if (!isset($_SERVER['HTTPS'])) {$pageURL .= "s";}
$pageURL .= "://";
if ($_SERVER["SERVER_PORT"] != "80") {
$pageURL .= $_SERVER["SERVER_NAME"].":".$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];
} else {
$pageURL .= $_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"];
}
return $ pageURL;
}
echo curPageURL();
/* output effect:
* http://192.168.0.180:84/demo7.php
* */
demo8.php
<?php
//PHP force download file
//Sometimes we don't want the browser to open the file directly, such as PDF file, but to download the file directly
//Then the following function can force the download of the file, the application/octet-stream header type is used in the function.
function download($filename){
if ((isset($filename))&&(file_exists($filename))){
header("Content-length: ".filesize($filename));
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename="' . $filename . '"');
readfile("$filename");
} else {
echo "Looks like file does not exist!";
}
}
download('demo.rar');
/* output effect:
* Directly download the specified file
* */
demo9.php
<?php
header('Content-Type: text/html; charset=utf-8');
//PHP intercepts the length of the string
//How many characters are exceeded, the length of the excess is represented by ...
function cutStr($string, $sublen, $start = 0, $code = 'UTF-8'){
if($code == 'UTF-8'){
$ pa = "/ [\ x01- \ x7f] | [\ xc2- \ xdf] [\ x80- \ xbf] | \ xe0 [\ xa0- \ xbf] [\ x80- \ xbf] | [\ xe1- \ xef] [\ x80- \ xbf] [\ x80- \ xbf] | \ xf0 [\ x90- \ xbf] [\ x80- \ xbf] [\ x80- \ xbf] | [\ xf1- \ xf7] [\ x80- \ xbf] [\ x80- \ xbf] [\ x80- \ xbf] / ";
preg_match_all($pa, $string, $t_string);
if(count($t_string[0]) - $start > $sublen) return join('', array_slice($t_string[0], $start, $sublen))."...";
return join('', array_slice($t_string[0], $start, $sublen));
}else{
$start = $start*2;
$sublen = $sublen*2;
$strlen = strlen($string);
$tmpstr = '';
for($i=0; $i<$strlen; $i++){
if($i>=$start && $i<($start+$sublen)){
if(ord(substr($string, $i, 1))>129){
$tmpstr.= substr($string, $i, 2);
}else{
$tmpstr.= substr($string, $i, 1);
}
}
if(ord(substr($string, $i, 1))>129) $i++;
}
if(strlen($tmpstr)<$strlen ) $tmpstr.= "...";
return $tmpstr;
}
}
$str = "Who is reading to ask the king to recite, the water will fall and the fragrance will float.";
echo cutStr($str,10);
/* output effect:
* Read who asks you to recite, the fragrance of water falls...
* */
demo10.php
<?php
//PHP gets the real IP of the client
function getIp() {
if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown"))
$ip = getenv("HTTP_CLIENT_IP");
else
if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown"))
$ip = getenv("HTTP_X_FORWARDED_FOR");
else
if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown"))
$ip = getenv("REMOTE_ADDR");
else
if (isset ($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown"))
$ip = $_SERVER['REMOTE_ADDR'];
else
$ip = "unknown";
return ($ip);
}
echo getIp();
/* output effect:
* 192.168.0.180
* */
demo11.php
<?php
header('Content-Type: text/html; charset=utf-8');
//PHP page prompts and jumps
function message($msgTitle,$message,$jumpUrl){
$str = '<!DOCTYPE HTML>';
$str .= '<html>';
$str .= '<head>';
$str .= '<meta charset="utf-8">';
$str .= '<title>Page Tips</title>';
$str .= '<style type="text/css">';
$str .= '*{margin:0; padding:0}a{color:#369; text-decoration:none;}a:hover{text-decoration:underline}body{height:100%; font:12px/18px Tahoma, Arial, sans-serif; color:#424242; background:#fff}.message{width:450px; height:120px; margin:16% auto; border:1px solid #99b1c4; background:#ecf7fb}.message h3{height:28px; line-height:28px; background:#2c91c6; text-align:center; color:#fff; font-size:14px}.msg_txt{padding:10px; margin-top:8px}.msg_txt h4{line-height:26px; font-size:14px}.msg_txt h4.red{color:#f30}.msg_txt p{line-height:22px}';
$str .= '</style>';
$str .= '</head>';
$str .= '<body>';
$str .= '<div>';
$str .= '<h3>'.$msgTitle.'</h3>';
$str .= '<div>';
$str .= '<h4>'.$message.'</h4>';
$str .= '<p>The system will automatically jump after <span style="color:blue;font-weight:bold">3</span> seconds, if you don't want to wait, just click <a href="{ $jumpUrl}">here</a> jump</p>';
$str .= "<script>setTimeout('location.replace(\'".$jumpUrl."\')',2000)</script>";
$str .= '</div>';
$str .= '</div>';
$str .= '</body>';
$str .= '</html>';
echo $str;
}
message('Operation prompt', 'Operation successful!','http://onestopweb.iteye.com/');
/* output effect:
* Operation tips
* Successful operation!
* The system will automatically jump after 3 seconds, if you don't want to wait, just click here to jump
* */
demo12.php
<?php
//PHP calculation time
function changeTimeType($seconds) {
if ($seconds > 3600) {
$hours = intval($seconds / 3600);
$minutes = $seconds % 3600;
$time = $hours . ":" . gmstrftime('%M:%S', $minutes);
} else {
$time = gmstrftime('%H:%M:%S', $seconds);
}
return $time;
}
$seconds = 23;
echo changeTimeType($seconds);
/* output effect:
* 00:00:23
* */