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You are probably wanting to use mb_strlen, for use on multi byte strings.
Set Search Time - A google chrome extension. When you search only results from the past year (or set time period) are displayed. Helps tremendously when using new technologies to avoid outdated results.
$str = 'συμβουλευτικών υπηρεσιών στον τομέα των τεχνολογικών εφαρμογών.';
echo mb_strlen($str, 'UTF-8');
EDIT| Returns 63 - just tested it
Set Search Time - A google chrome extension. When you search only results from the past year (or set time period) are displayed. Helps tremendously when using new technologies to avoid outdated results.