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, $mxrecords);}elsereturn true;elsereturn false;} 5. 列出目录内容function list_files($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 fooecho $obj->interest[1]; //prints php$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);
}
