function create_password($pw_length =  
{ 
$randpwd = ”; 
for ($i = 0; $i < $pw_length; $i++) 
{ 
$randpwd .= chr(mt_rand(33, 126)); 
} 
return $randpwd; 
} 
// 調(diào)用該函數(shù)，傳遞長(zhǎng)度參數(shù)$pw_length = 6 
echo create_password(6); 

function generate_password( $length = 8 ) { 
// 密碼字符集，可任意添加你需要的字符 
$chars = ‘a(chǎn)bcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()-_ []{}<>~`+=,.;:/?|'; 
$password = ”; 
for ( $i = 0; $i < $length; $i++ ) 
{ 
// 這里提供兩種字符獲取方式 
// 第一種是使用 substr 截取$chars中的任意一位字符； 
// 第二種是取字符數(shù)組 $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; 
} 

function make_password( $length = 8 ) 
{ 
 
// 密碼字符集，可任意添加你需要的字符 
$chars = array(‘a(chǎn)', ‘b', ‘c', ‘d', ‘e', ‘f', ‘g', ‘h', 
‘i', ‘j', ‘k', ‘l','m', ‘n', ‘o', ‘p', ‘q', ‘r', 's', 
‘t', ‘u', ‘v', ‘w', ‘x', ‘y','z', ‘A', ‘B', ‘C', ‘D', 
‘E', ‘F', ‘G', ‘H', ‘I', ‘J', ‘K', ‘L','M', ‘N', ‘O', 
‘P', ‘Q', ‘R', ‘S', ‘T', ‘U', ‘V', ‘W', ‘X', ‘Y','Z', 
‘0′, ‘1′, ‘2′, ‘3′, ‘4′, ‘5′, ‘6′, ‘7′, ‘8′, ‘9′, ‘!', 
‘@','#', ‘$', ‘%', ‘^', ‘&', ‘*', ‘(‘, ‘)', ‘-', ‘_', 
‘[', ']‘, ‘{‘, ‘}', ‘<', ‘>', ‘~', ‘`', ‘+', ‘=', ‘,', 
‘.', ‘;', ‘:', ‘/', ‘?', ‘|'); 
 
// 在 $chars 中隨機(jī)取 $length 個(gè)數(shù)組元素鍵名 
$keys = ($chars, $length); 
$password = ”; 
for($i = 0; $i < $length; $i++) 
{ 
// 將 $length 個(gè)數(shù)組元素連接成字符串 
$password .= $chars[$keys[$i]]; 
} 
return $password; 
}