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åŸºæœ¬æ•°æ®ç»“æž„å’Œphpå†…ç½®å‡½æ•°

/ Published in: PHP

sorting, searching in array, some string function

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//--------------------
// åŸºæœ¬æ•°æ®ç»“æž„
//--------------------

//äºŒåˆ†æŸ¥æ‰¾ï¼ˆæ•°ç»„é‡ŒæŸ¥æ‰¾æŸä¸ªå…ƒç´ ï¼‰
function bin_sch($array, $low, $high, $k){
if ($low <= $high){
$mid = intval(($low+$high)/2);
if ($array[$mid] == $k){
return $mid;
}elseif ($k < $array[$mid]){
return bin_sch($array, $low, $mid-1, $k);
}else{
return bin_sch($array, $mid+1, $high, $k);
}
}
return -1;
}

//é¡ºåºæŸ¥æ‰¾ï¼ˆæ•°ç»„é‡ŒæŸ¥æ‰¾æŸä¸ªå…ƒç´ ï¼‰
function seq_sch($array, $n, $k){
$array[$n] = $k;
for($i=0; $i<$n; $i++){
if($array[$i]==$k){
break;
}
}
if ($i<$n){
return $i;
}else{
return -1;
}
}

//çº¿æ€§è¡¨çš„åˆ é™¤ï¼ˆæ•°ç»„ä¸å®žçŽ°ï¼‰
function delete_array_element($array, $i)
{
$len = count($array);
for ($j=$i; $j<$len; $j++){
$array[$j] = $array[$j+1];
}
array_pop($array);
return $array;
}

//å†’æ³¡æŽ’åºï¼ˆæ•°ç»„æŽ’åºï¼‰
function bubble_sort($array)
{
$count = count($array);
if ($count <= 0) return false;

for($i=0; $i<$count; $i++){
for($j=$count-1; $j>$i; $j--){
if ($array[$j] < $array[$j-1]){
$tmp = $array[$j];
$array[$j] = $array[$j-1];
$array[$j-1] = $tmp;
}
}
}
return $array;
}

//å¿«é€ŸæŽ’åºï¼ˆæ•°ç»„æŽ’åºï¼‰
function quicksort($array) {
if (count($array) <= 1) return $array;

$key = $array[0];
$left_arr = array();
$right_arr = array();

for ($i=1; $i<count($array); $i++){
if ($array[$i] <= $key)
$left_arr[] = $array[$i];
else
$right_arr[] = $array[$i];
}

$left_arr = quicksort($left_arr);
$right_arr = quicksort($right_arr);

return array_merge($left_arr, array($key), $right_arr);
}

//------------------------
// PHPå†…ç½®å—ç¬¦ä¸²å‡½æ•°å®žçŽ°
//------------------------

//å—ç¬¦ä¸²é•¿åº¦
function strlen($str)
{
if ($str == '') return 0;

$count = 0;
while (1){
if ($str[$count] != NULL){
$count++;
continue;
}else{
break;
}
}
return $count;
}

//æˆªå–åä¸²
function substr($str, $start, $length=NULL)
{
if ($str=='' || $start>strlen($str)) return;
if (($length!=NULL) && ($start>0) && ($length>strlen($str)-$start)) return;
if (($length!=NULL) && ($start<0) && ($length>strlen($str)+$start)) return;

if ($length == NULL) $length = (strlen($str) - $start);
if ($start < 0){
for ($i=(strlen($str)+$start); $i<(strlen($str)+$start+$length); $i++) {
$substr .= $str[$i];
}
}

if ($length > 0){
for ($i=$start; $i<($start+$length); $i++) {
$substr .= $str[$i];
}
}

if ($length < 0){
for ($i=$start; $i<(strlen($str)+$length); $i++) {
$substr .= $str[$i];
}
}
return $substr;
}

//å—ç¬¦ä¸²ç¿»è½¬
function strrev($str)
{
if ($str == '') return 0;
for ($i=(strlen($str)-1); $i>=0; $i--){
$rev_str .= $str[$i];
}
return $rev_str;
}

//å—ç¬¦ä¸²æ¯”è¾ƒ
function strcmp($s1, $s2)
{
if (strlen($s1) < strlen($s2)) return -1;
if (strlen($s1) > strlen($s2)) return 1;

for ($i=0; $i<strlen($s1); $i++){
if ($s1[$i] == $s2[$i]){
continue;
}else{
return false;
}
}
return 0;
}

//æŸ¥æ‰¾å—ç¬¦ä¸²
function strstr($str, $substr)
{
$m = strlen($str);
$n = strlen($substr);
if ($m < $n) return false;

for ($i=0; $i<=($m-$n+1); $i++){
$sub = substr($str, $i, $n);
if (strcmp($sub, $substr) == 0) return $i;
}
return false;
}

//å—ç¬¦ä¸²æ›¿æ¢
function str_replace($substr, $newsubstr, $str)
{
$m = strlen($str);
$n = strlen($substr);
$x = strlen($newsubstr);
if (strchr($str, $substr) == false) return false;

for ($i=0; $i<=($m-$n+1); $i++){
$i = strchr($str, $substr);
$str = str_delete($str, $i, $n);
$str = str_insert($str, $i, $newstr);
}
return $str;
}

//--------------------
// è‡ªå®žçŽ°å‡½æ•°
//--------------------

//æ’å…¥ä¸€æ®µå—ç¬¦ä¸²
function str_insert($str, $i, $substr)
{
for($j=0; $j<$i; $j++){
$startstr .= $str[$j];
}
for ($j=$i; $j<strlen($str); $j++){
$laststr .= $str[$j];
}
$str = ($startstr . $substr . $laststr);
return $str;
}

//åˆ é™¤ä¸€æ®µå—ç¬¦ä¸²
function str_delete($str, $i, $j)
{
for ($c=0; $c<$i; $c++){
$startstr .= $str[$c];
}
for ($c=($i+$j); $c<strlen($str); $c++){
$laststr .= $str[$c];
}
$str = ($startstr . $laststr);

return $str;
}

//å¤åˆ¶å—ç¬¦ä¸²
function strcpy($s1, $s2)
{
if (strlen($s1)==NULL || !isset($s2)) return;

for ($i=0; $i<strlen($s1); $i++){
$s2[] = $s1[$i];
}
return $s2;
}

//è¿žæŽ¥å—ç¬¦ä¸²
function strcat($s1, $s2)
{
if (!isset($s1) || !isset($s2)) return;
$newstr = $s1;
for($i=0; $i<count($s); $i++){
$newstr .= $st[$i];
}
return $newsstr;
}

//ç®€å•ç¼–ç å‡½æ•°ï¼ˆä¸Žphp_decodeå‡½æ•°å¯¹åº”ï¼‰
function php_encode($str)
{
if ($str=='' && strlen($str)>128) return false;

for($i=0; $i<strlen($str); $i++){
$c = ord($str[$i]);
if ($c>31 && $c<107) $c += 20;
if ($c>106 && $c<127) $c -= 75;
$word = chr($c);
$s .= $word;
}

return $s;
}

//ç®€å•è§£ç å‡½æ•°ï¼ˆä¸Žphp_encodeå‡½æ•°å¯¹åº”ï¼‰
function php_decode($str)
{
if ($str=='' && strlen($str)>128) return false;

for($i=0; $i<strlen($str); $i++){
$c = ord($word);
if ($c>106 && $c<127) $c = $c-20;
if ($c>31 && $c<107) $c = $c+75;
$word = chr($c);
$s .= $word;
}

return $s;
}

//ç®€å•åŠ å¯†å‡½æ•°ï¼ˆä¸Žphp_decryptå‡½æ•°å¯¹åº”ï¼‰
function php_encrypt($str)
{
$encrypt_key = 'abcdefghijklmnopqrstuvwxyz1234567890';
$decrypt_key = 'ngzqtcobmuhelkpdawxfyivrsj2468021359';

if (strlen($str) == 0) return false;

for ($i=0; $i<strlen($str); $i++){
for ($j=0; $j<strlen($encrypt_key); $j++){
if ($str[$i] == $encrypt_key[$j]){
$enstr .= $decrypt_key[$j];
break;
}
}
}

return $enstr;
}

//ç®€å•è§£å¯†å‡½æ•°ï¼ˆä¸Žphp_encryptå‡½æ•°å¯¹åº”ï¼‰
function php_decrypt($str)
{
$encrypt_key = 'abcdefghijklmnopqrstuvwxyz1234567890';
$decrypt_key = 'ngzqtcobmuhelkpdawxfyivrsj2468021359';

if (strlen($str) == 0) return false;

for ($i=0; $i<strlen($str); $i++){
for ($j=0; $j<strlen($decrypt_key); $j++){
if ($str[$i] == $decrypt_key[$j]){
$enstr .= $encrypt_key[$j];
break;
}
}
}

return $enstr;
}

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