Utf8String

Tests whether a string contains only 7bit ASCII bytes.

You might use this to conditionally check whether a string needs handling as UTF-8 or not, potentially offering performance benefits by using the native PHP equivalent if it's just ASCII e.g.;

php if (String::is_ascii($someString)) { // It's just ASCII - use the native PHP version $someString = strtolower($someString); } else { $someString = String::strtolower($someString); }

UTF-8 aware alternative to strpos.

Find position of first occurrence of a string.

UTF-8 aware alternative to strrpos Finds position of last occurrence of a string

UTF-8 aware alternative to substr Return part of a string given character offset (and optionally length)

UTF-8 aware alternative to strtlower

Make a string lowercase Note: The concept of a characters "case" only exists is some alphabets such as Latin, Greek, Cyrillic, Armenian and archaic Georgian - it does not exist in the Chinese alphabet, for example. See Unicode Standard Annex #21: Case Mappings

UTF-8 aware alternative to strtoupper Make a string uppercase Note: The concept of a characters "case" only exists is some alphabets such as Latin, Greek, Cyrillic, Armenian and archaic Georgian - it does not exist in the Chinese alphabet, for example. See Unicode Standard Annex #21: Case Mappings

UTF-8 aware alternative to strlen.

Returns the number of characters in the string (NOT THE NUMBER OF BYTES),

UTF-8 aware alternative to strireplace Case-insensitive version of strreplace

UTF-8 aware alternative to str_split Convert a string to an array

UTF-8/LOCALE aware alternative to strcasecmp A case insensitive string comparison

UTF-8/LOCALE aware alternative to strcmp A case sensitive string comparison

UTF-8 aware alternative to strcspn Find length of initial segment not matching mask

UTF-8 aware alternative to stristr Returns all of haystack from the first occurrence of needle to the end.

needle and haystack are examined in a case-insensitive manner Find first occurrence of a string using case insensitive comparison

UTF-8 aware alternative to strrev Reverse a string

UTF-8 aware alternative to strspn Find length of initial segment matching mask

UTF-8 aware substr_replace Replace text within a portion of a string

UTF-8 aware replacement for ltrim()

Strip whitespace (or other characters) from the beginning of a string You only need to use this if you are supplying the charlist optional arg and it contains UTF-8 characters. Otherwise ltrim will work normally on a UTF-8 string

UTF-8 aware replacement for rtrim() Strip whitespace (or other characters) from the end of a string You only need to use this if you are supplying the charlist optional arg and it contains UTF-8 characters. Otherwise rtrim will work normally on a UTF-8 string

UTF-8 aware replacement for trim() Strip whitespace (or other characters) from the beginning and end of a string Note: you only need to use this if you are supplying the charlist optional arg and it contains UTF-8 characters. Otherwise trim will work normally on a UTF-8 string

UTF-8 aware alternative to ucfirst Make a string's first character uppercase or all words' first character uppercase

UTF-8 aware alternative to ucwords Uppercase the first character of each word in a string

Transcode a string.

Tests a string as to whether it's valid UTF-8 and supported by the Unicode standard.

Note: this function has been modified to simple return true or false.

Tests whether a string complies as UTF-8. This will be much faster than utf8isvalid but will pass five and six octet UTF-8 sequences, which are not supported by Unicode and so cannot be displayed correctly in a browser. In other words it is not as strict as utf8isvalid but it's faster. If you use it to validate user input, you place yourself at the risk that attackers will be able to inject 5 and 6 byte sequences (which may or may not be a significant risk, depending on what you are are doing)

Converts Unicode sequences to UTF-8 string

Converts Unicode sequences to UTF-16 string