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- added info on utf8_strtolower/upper

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git-svn-id: file:///svn/phpbb/trunk@8036 89ea8834-ac86-4346-8a33-228a782c2dd0
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Nils Adermann 2007-08-16 13:48:29 +00:00
parent 487ca92299
commit da55886024
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phpBB/docs/coding-guidelines.html
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@ -1603,7 +1603,7 @@ echo request_var('multibyte_string', '');
<h3>Case Folding</h3>
<p>Case insensitive comparison of strings is no longer possible with <code>strtolower</code> or <code>strtoupper</code> as some characters have multiple lower case or multiple upper case forms depending on their position in a word. So instead you should use case folding which gives you a case insensitive version of the string which can be used for case insensitive comparisons. An NFC normalized string can be case folded using <code>utf8_case_fold_nfc()</code>.</p>
<p>Case insensitive comparison of strings is no longer possible with <code>strtolower</code> or <code>strtoupper</code> as some characters have multiple lower case or multiple upper case forms depending on their position in a word. The <code>utf8_strtolower</code> and the <code>utf8_strtoupper</code> functions suffer from the same problem so they can only be used to display upper/lower case versions of a string but they cannot be used for case insensitive comparisons either. So instead you should use case folding which gives you a case insensitive version of the string which can be used for case insensitive comparisons. An NFC normalized string can be case folded using <code>utf8_case_fold_nfc()</code>.</p>
<p class="bad">// Bad - The strings might be the same even if strtolower differs</p>