Optimize strtolower()/strtoupper() #1673
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Nice catch... thanks |
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In PHP 7, unnecessary string copy is decreased from PHP 5 because of reference counting in
zend_string. For example, return value ofstrtolower("abc")points the originalzend_stringand never duplicate the string.However,
strtolower("abc1")causes memory allocation. The current implementation ofstrtolowerrequires that all characters satisfyislower(c)for avoiding the string duplication. It seems too strict and inaccurate.