关键代码如下所示：
<?php function i_array_column($input, $columnKey, $indexKey=null){ if(!function_exists('array_column')){ $columnKeyIsNumber = (is_numeric($columnKey))?true:false; $indexKeyIsNull = (is_null($indexKey))?true :false; $indexKeyIsNumber = (is_numeric($indexKey))?true:false; $result = array(); foreach((array)$input as $key=>$row){ if($columnKeyIsNumber){ $tmp= array_slice($row, $columnKey, 1); $tmp= (is_array($tmp) && !empty($tmp))?current($tmp):null; }else{ $tmp= isset($row[$columnKey])?$row[$columnKey]:null; } if(!$indexKeyIsNull){ if($indexKeyIsNumber){ $key = array_slice($row, $indexKey, 1); $key = (is_array($key) && !empty($key))?current($key):null; $key = is_null($key)?0:$key; }else{ $key = isset($row[$indexKey])?$row[$indexKey]:0; } } $result[$key] = $tmp; } return $result; }else{ return array_column($input, $columnKey, $indexKey); } } function randcode($len, $mode = 2){ $rcode = ''; switch($mode){ case 1: //去除0、o、O、l等易混淆字符 $chars = 'ABCDEFGHJKLMNPQRSTUVWXYZ23456789abcdefghijkmnpqrstuvwxyz'; break; case 2: //纯数字 $chars = '0123456789'; break; case 3: //全数字+大小写字母 $chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz'; break; case 4: //全数字+大小写字母+一些特殊字符 $chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz~!@#$%^&*()'; break; } $count = strlen($chars) - 1; mt_srand((double)microtime() * 1000000); for($i = 0; $i < $len; $i++) { $rcode .= $chars[mt_rand(0, $count)]; } return $rcode; } /** * $string 明文或密文 * $operation 加密ENCODE或解密DECODE * $key 密钥 * $expiry 密钥有效期 */ function authcode($string, $operation = 'DECODE', $key = '', $expiry = 0) { $ckey_length = 4; $key = md5($key); $keya = md5(substr($key, 0, 16)); $keyb = md5(substr($key, 16, 16)); $keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length): substr(md5(microtime()), -$ckey_length)) : ''; $cryptkey = $keya.md5($keya.$keyc); $key_length = strlen($cryptkey); $string = $operation == 'DECODE' ? base64_decode(substr($string, $ckey_length)) : sprintf('%010d', $expiry ? $expiry + time() : 0).substr(md5($string.$keyb), 0, 16).$string; $string_length = strlen($string); $result = ''; $box = range(0, 255); $rndkey = array(); for($i = 0; $i <= 255; $i++) { $rndkey[$i] = ord($cryptkey[$i % $key_length]); } for($j = $i = 0; $i < 256; $i++) { $j = ($j + $box[$i] + $rndkey[$i]) % 256; $tmp = $box[$i]; $box[$i] = $box[$j]; $box[$j] = $tmp; } for($a = $j = $i = 0; $i < $string_length; $i++) { $a = ($a + 1) % 256; $j = ($j + $box[$a]) % 256; $tmp = $box[$a]; $box[$a] = $box[$j]; $box[$j] = $tmp; $result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256])); } if($operation == 'DECODE') { if((substr($result, 0, 10) == 0 || substr($result, 0, 10) - time() > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26).$keyb), 0, 16)) { return substr($result, 26); } else { return ''; } } else { return $keyc.str_replace('=', '', base64_encode($result)); } }
以上所述是小编给大家介绍的PHP加密解密类实例代码，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持！
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