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array()
create_array()
make_array()
build_array()
abs()
absolute()
val()
value()
strlen()
string_length()
length()
str_length()
trim()
remove_whitespace()
strip()
clean()
sort()
ascending()
arrange()
order()
unset()
remove()
delete()
pop()
str_replace()
replace()
string_replace()
swap()
strtoupper()
to_uppercase()
upper()
convert_upper()
explode()
string_to_array()
str_array()
strtolower()
to_lowercase()
lower()
convert_lower()