php代码
<?php
/**
* 字符串，重复值压缩
* @param string $str 字符串
* @param string $code_type encode|decode
* @return string|mixed
*/
function str_compress($str, $code_type='encode') {
$code_type = strtolower(trim($code_type));
if ('encode' == $code_type || $code_type) {
$res = preg_replace_callback('#(.)(\1+)#is', function($match){
return $match [1] . '[' . strlen($match[0]) . ']';
}, $str);
} else {
$res = preg_replace_callback('#(.)\[(\d+)\]#is', function($match){
return str_repeat($match [1], $match [2]);
}, $str);
}
return $res;
}
// 测试 -----------------
$old_str = $str = 'aavaabbcce';
echo $old_str;
echo "";
$str = str_compress($str);
echo $str;
echo "";
$str = str_compress($str, 0);
echo $str;
echo "";
if ($str == $old_str) {
echo 1;
} else {
echo 0;
}
