{"id":91,"date":"2009-08-26T03:45:15","date_gmt":"2009-08-26T03:45:15","guid":{"rendered":"http:\/\/yuguangzhang.com\/blog\/?p=91"},"modified":"2009-08-26T03:45:15","modified_gmt":"2009-08-26T03:45:15","slug":"shifting-unicode-codepoints","status":"publish","type":"post","link":"http:\/\/yuguangzhang.com\/blog\/shifting-unicode-codepoints\/","title":{"rendered":"Shifting Unicode Codepoints"},"content":{"rendered":"

While working on a word search generator that translated letter symbols (sort of like cryptograms, except this one’s impossible to solve without the key), php ran out of memory on a rather ordinary function.
\n[cc lang=”php”]
\nfunction uniord($c) {
\n $h = ord($c{0});
\n if ($h <= 0x7F) {
\n return $h;
\n } else if ($h < 0xC2) {
\n return false;
\n } else if ($h <= 0xDF) {
\n return ($h & 0x1F) << 6 | (ord($c{1}) & 0x3F);
\n } else if ($h <= 0xEF) {
\n return ($h & 0x0F) << 12 | (ord($c{1}) & 0x3F) << 6
\n | (ord($c{2}) & 0x3F);
\n } else if ($h <= 0xF4) {
\n return ($h & 0x0F) << 18 | (ord($c{1}) & 0x3F) << 12
\n | (ord($c{2}) & 0x3F) << 6
\n | (ord($c{3}) & 0x3F);
\n } else {
\n return false;
\n }
\n}
\nfunction unichr($c) {
\n if ($c <= 0x7F) {
\n return chr($c);
\n } else if ($c <= 0x7FF) {
\n return chr(0xC0 | $c >> 6) . chr(0x80 | $c & 0x3F);
\n } else if ($c <= 0xFFFF) {
\n return chr(0xE0 | $c >> 12) . chr(0x80 | $c >> 6 & 0x3F)
\n . chr(0x80 | $c & 0x3F);
\n } else if ($c <= 0x10FFFF) {
\n return chr(0xF0 | $c >> 18) . chr(0x80 | $c >> 12 & 0x3F)
\n . chr(0x80 | $c >> 6 & 0x3F)
\n . chr(0x80 | $c & 0x3F);
\n } else {
\n return false;
\n }
\n}
\nfunction asc_shift($string, $amount) {
\n $key = substr($string, 0, 1);
\n if(strlen($string)==1) {
\n return unichr(uniord($key) + $amount);
\n } else {
\n return unichr(uniord($key) + $amount) . asc_shift(substr($string, 1, strlen($string)-1), $amount);
\n }
\n}
\n[\/cc]
\nNow I understand why there is a need for a lower level implementation of UTF-8 strings by default in php 6. Python support of UTF-8 support has already been included in Python 3.0 released December 3rd<\/em>, 2008.<\/p>\n","protected":false},"excerpt":{"rendered":"

While working on a word search generator that translated letter symbols (sort of like cryptograms, except this one’s impossible to solve without the key), php ran out of memory on a rather ordinary function. [cc lang=”php”] function uniord($c) { $h = ord($c{0}); if ($h <= 0x7F) { return $h; } else if ($h < 0xC2) […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[23],"tags":[],"class_list":["post-91","post","type-post","status-publish","format-standard","hentry","category-programming"],"aioseo_notices":[],"_links":{"self":[{"href":"http:\/\/yuguangzhang.com\/blog\/wp-json\/wp\/v2\/posts\/91","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/yuguangzhang.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/yuguangzhang.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/yuguangzhang.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/yuguangzhang.com\/blog\/wp-json\/wp\/v2\/comments?post=91"}],"version-history":[{"count":0,"href":"http:\/\/yuguangzhang.com\/blog\/wp-json\/wp\/v2\/posts\/91\/revisions"}],"wp:attachment":[{"href":"http:\/\/yuguangzhang.com\/blog\/wp-json\/wp\/v2\/media?parent=91"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/yuguangzhang.com\/blog\/wp-json\/wp\/v2\/categories?post=91"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/yuguangzhang.com\/blog\/wp-json\/wp\/v2\/tags?post=91"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}