转载的, 用着方便!
1. 可阅读随机字符串
此代码将创建一个可阅读的字符串，使其更接近词典中的单词，实用且具有密码验证功能
function readable_random_string($length = 6){
$conso=array("b","c","d","f","g","h","j","k","l",
"m","n","p","r","s","t","v","w","x","y","z");
$vocal=array("a","e","i","o","u");
$password="";
srand ((double)microtime()*1000000);
$max = $length/2;
for($i=1; $i<=$max; $i++)
{
$password.=$conso[rand(0,19)];
$password.=$vocal[rand(0,4)];
}
return $password;
}
2. 生成一个随机字符串
如果不需要可阅读的字符串，使用此函数替代，即可创建一个随机字符串，作为用户的随机密码等。
function generate_rand($len){
$c= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
srand((double)microtime()*1000000);
for($i=0; $i<$len; $i++) {
$rand.= $c[rand()%strlen($c)];
}
return $rand;
}
function rand_password( $length = 8 ) {
// 密码字符集，可任意添加你需要的字符
$chars = ‘abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()-_ []{}<>~`+=,.;:/?|’;
$password = ”;
for ( $i = 0; $i < $length; $i++ )
{
// 这里提供两种字符获取方式
// 第一种是使用 substr 截取$chars中的任意一位字符；
// 第二种是取字符数组 $chars 的任意元素
// $password .= substr($chars, mt_rand(0, strlen($chars) – 1), 1);
$password .= $chars[ mt_rand(0, strlen($chars) - 1) ];
}
return $password;
}
3. 编码电子邮件地址
可以将任何电子邮件地址编码为 HTML 字符实体，以防止被垃圾邮件程序收集。
function encode_email($email='info@domain.com', $linkText='Contact Us', $attrs ='class="emailencoder"' )
{
// remplazar aroba y puntos
$email = str_replace('@', '@', $email);
$email = str_replace('.', '.', $email);
$email = str_split($email, 5);
$linkText = str_replace('@', '@', $linkText);
$linkText = str_replace('.', '.', $linkText);
$linkText = str_split($linkText, 5);
$part1 = '<a href="ma';
$part2 = 'ilto:';
$part3 = '" '. $attrs .' >';
$part4 = '</a>';
$encoded = '<script type="text/javascript">';
$encoded .= "document.write('$part1');";
$encoded .= "document.write('$part2');";
foreach($email as $e)
{
$encoded .= "document.write('$e');";
}
$encoded .= "document.write('$part3');";
foreach($linkText as $l)
{
$encoded .= "document.write('$l');";
}
$encoded .= "document.write('$part4');";
$encoded .= '</script>';
return $encoded;
}
4. 验证邮件地址
此代码除了验证电子邮件地址，也可以选择检查邮件域所属 DNS 中的 MX 记录，使邮件验证功能更加强大
function is_valid_email($email, $test_mx = false)
{
if(eregi("^([_a-z0-9-]+)(\.[_a-z0-9-]+)*@([a-z0-9-]+)(\.[a-z0-9-]+)*(\.[a-z]{2,4})$", $email))
if($test_mx)
{
list($username, $domain) = split("@", $email);
return getmxrr($domain, $mxrecords);
}
else
return true;
else
return false;
}
5. 列出目录内容
function list_files($dir)
{
if(is_dir($dir))
{
if($handle = opendir($dir))
{
while(($file = readdir($handle)) !== false)
{
if($file != "." && $file != ".." && $file != "Thumbs.db")
{
echo '<a target="_blank" href="'.$dir.$file.'">'.$file.'</a><br>'."\n";
}
}
closedir($handle);
}
}
}
-----------------------------
function list_dir($path){
$dp = dir($path);
while( $fp = $dp->read() ){
if ( $fp=='.' ){
}
}
}
-----------------------------
7. 解析 JSON 数据
$json_string='{"id":1,"name":"foo","email":"foo@foobar.com","interest":["wordpress","php"]} ';
$obj=json_decode($json_string);
echo $obj->name; //prints foo
echo $obj->interest[1]; //prints php
$ary = json_decode($json_string,true);
echo $ary['id'];
10. 获取客户端真实 IP 地址
function getRealIpAddr()
{
if (!emptyempty($_SERVER['HTTP_CLIENT_IP']))
{
$ip=$_SERVER['HTTP_CLIENT_IP'];
}
elseif (!emptyempty($_SERVER['HTTP_X_FORWARDED_FOR']))
//to check ip is pass from proxy
{
$ip=$_SERVER['HTTP_X_FORWARDED_FOR'];
}
else
{
$ip=$_SERVER['REMOTE_ADDR'];
}
return $ip;
}
11. 强制性文件下载
function force_download($file)
{
if ((isset($file))&&(file_exists($file))) {
header("Content-length: ".filesize($file));
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename="' . $file . '"');
readfile("$file");
} else {
echo "No file selected";
}
}
12. 创建标签云
function getCloud($data = array(), $minFontSize = 12, $maxFontSize = 30){
$minimumCount = min(array_values($data));
$maximumCount = max(array_values($data));
$spread = $maximumCount - $minimumCount;
$cloudHTML = '';
$cloudTags = array();
$spread == 0 && $spread = 1;
foreach($data as $tag => $count){
$size = $minFontSize + ($count - $minimumCount) * ($maxFontSize - $minFontSize) / $spread;
$cloudTags[] = '<a style="font-size: ' . floor($size) . 'px'
. '" href="#" title="\'' . $tag . '\' returned a count of ' . $count . '">'
. htmlspecialchars(stripslashes($tag)) . '</a>';
}
return join("\n", $cloudTags) . "\n";
}
/**
* Sample usage **
*/
$arr = Array('Actionscript' => 35, 'Adobe' => 22, 'Array' => 44, 'Background' => 43,
'Blur' => 18, 'Canvas' => 33, 'Class' => 15, 'Color Palette' => 11, 'Crop' => 42,
'Delimiter' => 13, 'Depth' => 34, 'Design' => 8, 'Encode' => 12, 'Encryption' => 30,
'Extract' => 28, 'Filters' => 42);
echo getCloud($arr, 12, 36);
13. 寻找两个字符串的相似性
similar_text('abcde', 'abcdef', $percent);
echo $percent;
16. 文件 Zip 压缩
function create_zip($files = array(), $destination = '', $overwrite = false){
if(file_exists($destination) && !$overwrite){
return false;
}
$valid_files = array();
if(is_array($files)){
foreach($files as $file){
if(file_exists($file)){
$valid_files[] = $file;
}
}
}
if(count($valid_files)){
$zip = new ZipArchive();
if($zip -> open($destination, $overwrite ? ZIPARCHIVE :: OVERWRITE : ZIPARCHIVE :: CREATE) !== true){
return false;
}
foreach($valid_files as $file){
$zip -> addFile($file, $file);
}
$zip -> close();
return file_exists($destination);
}else{
return false;
}
}
/**
* **** Example Usage **
*/
$files = array('question_20120828_211308.csv', 'question_20120828_211326.csv');
create_zip($files, 'myzipfile.zip', true);
17. 解压缩 Zip 文件
function unzip_file($file, $destination){
$zip = new ZipArchive() ;
if ($zip->open($file) !== TRUE) {
die ('Could not open archive');
}
$zip->extractTo($destination);
$zip->close();
}
20. 调整图像尺寸
$imgsrc = "http://www.nowamagic.net/images/3.jpg";
$width = 780;
$height = 420;
resizejpg($imgsrc, $imgdst, $width, $height);
function resizejpg($imgsrc, $imgdst, $imgwidth, $imgheight){
// $imgsrc jpg格式图像路径 $imgdst jpg格式图像保存文件名 $imgwidth要改变的宽度 $imgheight要改变的高度
// 取得图片的宽度,高度值
$arr = getimagesize($imgsrc);
header("Content-type: image/jpg");
$imgWidth = $imgwidth;
$imgHeight = $imgheight;
// Create image and define colors
$imgsrc = imagecreatefromjpeg($imgsrc);
$image = imagecreatetruecolor($imgWidth, $imgHeight); //创建一个彩色的底图
imagecopyresampled($image, $imgsrc, 0, 0, 0, 0, $imgWidth, $imgHeight, $arr[0], $arr[1]);
imagepng($image);
imagedestroy($image);
}
21. 数组转 json 格式, 包含中文字符 替代json_encode
function jsonEncode($var) {
switch (gettype($var)) {
case 'boolean':
return $var ? 'true' : 'false';
case 'integer':
case 'double':
return $var;
case 'resource':
case 'string':
return '"'. str_replace(array("\r", "\n", "<", ">", "&"),
array('\r', '\n', '\x3c', '\x3e', '\x26'),
addslashes($var)) .'"';
case 'array':
if (empty($var) || array_keys($var) === range(0, sizeof($var) - 1)) {
$output = array();
foreach ($var as $v) {
$output[] = jsonEncode($v);
}
return '[ '. implode(', ', $output) .' ]';
}
case 'object':
$output = array();
foreach ($var as $k => $v) {
$output[] = jsonEncode(strval($k)) .': '. jsonEncode($v);
}
return '{ '. implode(', ', $output) .' }';
default:
return 'null';
}
}
22. 删除目录及其下所有文件
//Delete folder function
function deleteDirectory($dir) {
if (!file_exists($dir)) return true;
if (!is_dir($dir) || is_link($dir)) return unlink($dir);
foreach (scandir($dir) as $item) {
if ($item == '.' || $item == '..') continue;
if (!deleteDirectory($dir . "/" . $item)) {
chmod($dir . "/" . $item, 0777);
if (!deleteDirectory($dir . "/" . $item)) return false;
};
}
return rmdir($dir);
}
