1. PHP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。
- /***************
- @length - length of random string (must be a multiple of 2)**************/
- 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 $password;
- }
2. PHP生成一个随机字符串
如果不需要可阅读的字符串,使用此函数替代,即可创建一个随机字符串,作为用户的随机密码等。
- /*************
- *@l - length of random string
- */
- function generate_rand($l){
- $c= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
- srand((double)microtime()*1000000);
- for($i=0; $i<$l; $i++) {
- $rand.= $c[rand()%strlen($c)];
- }
- return $rand;
- }
3. PHP编码电子邮件地址
使用此代码,可以将任何电子邮件地址编码为 html 字符实体,以防止被垃圾邮件程序收集。
- function encode_email($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 = 'part2 = 'ilto:'; $part3 = '" '. $attrs .' >';
- $part4 = '';
- $encoded = '';
- $encoded .= "document.write('$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 .= ''; return $encoded;}
4. PHP验证邮件地址
电子邮件验证也许是中最常用的网页表单验证,此代码除了验证电子邮件地址,也可以选择检查邮件域所属 DNS 中的 MX 记录,使邮件验证功能更加强大。
- function is_valid_email($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;
- }