Some native PHP string functions have a parameter which is a string of one or more unordered characters (also referred to as a "character mask"). In some cases, character ranges can be expressed using double-dot syntax.
For example: echo trim('foo24', '0..9'); prints foo because 2 and 4 fall within the 0 through 9 range.
What are the other native PHP string functions with the same feature?
Native PHP string functions that respect double-dot range expressions:
addcslashes() (Demo)
echo addcslashes('adobe', 'a..e');
// \a\do\b\e
chop() -- alias of rtrim() (Demo)
echo chop('adobe', 'a..e');
// ado
ltrim() (Demo)
echo ltrim('adobe', 'a..e');
// obe
rtrim() (Demo)
echo rtrim('adobe', 'a..e');
// ado
str_word_count() (Demo)
var_export(
str_word_count('do not break|on|pipe', 1, '{..}')
);
// ['do', 'not', 'break|on|pipe']
trim() (Demo)
echo trim('adobe', 'a..e');
// o
ucwords() (Demo)
echo ucwords('backdoorman', 'a..e');
// BaCkdOormaN
Here are some native functions where ranged expressions are not expanded, but might be reasonable candidates for the feature:
strcspn() (Demo) (expansion would be reasonable)
echo strcspn('cdplayer', 'b..e');
// 6
// 0 if range enabled
strpbrk() (Demo) (expansion would be reasonable)
echo strpbrk('stackoverflow', 'b..f');
// flow
// ckoverflow if range enabled
strspn() (Demo) (expansion would be reasonable)
echo strspn('adobe', 'a..e');
// 1
// 2 if range enabled
strtok() (Demo) (expansion would be reasonable)
echo strtok('toddler', 'a..e');
// toddl
// to if range enabled
strtr() (Demo) (out of topic scope because not technically a character mask -- character order matters)
echo strtr('adobe', 'a..e', 'A..E');
// AdobE
// ADoBE if range enabled
Due to technical challenges of supporting .. syntax with multibyte characters, the following native functions will not allow ..
Ref: https://wiki.php.net/rfc/mb_trim
mb_ltrim()mb_rtrim()mb_trim()