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@ 2015-09-22T14:54:25Z

<?php

$collator = new Collator('ru');

$str1 = $collator->getSortKey('Abc');
$str2 = $collator->getSortKey('Абв');

var_dump(strcmp('Abc', 'Абв'));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
strcmp: documentation ( source)

preferences:dark modelive preview

55.05 ms | 402 KiB | 5 Q