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this can be used to achieve case insensitive pattern matching in products which support only case sensitive regular expressions.
this can be used to achieve case insensitive pattern matching in products which support only case sensitive regular expressions.

to sort on bib1 attribute title, case insensitive, and ascending you'd use the following sort criteria:
1=4 ia

the attribute index is converted to lowercase. (attributes are case-insensitive for directory servers, but not when used as array indices)
the attribute index is converted to lowercase. (attributes are case-insensitive for directory servers, but not when used as array indices.)

natcasesort() is a case insensitive version of natsort(). see natsort() for an example of the difference between this algorithm and the regular computer string sorting algorithms.
see natsort() for an example of the difference between this algorithm and the regular computer string sorting algorithms.

the optional third parameter case_insensitive is also available. if the value 1 is given, then the constant will be defined case-insensitive. the default behaviour is case-sensitive; i.e. constant and constant represent different values.
returns true on success or false on failure.